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| 57 | <ul> |
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| 58 | <li><a href="../index.html">GeoExt</a> »</li> |
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| 60 | <li><a href="#">Layer Tree Tutorial</a></li> |
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| 66 | <h3><a href="../index.html">Table Of Contents</a></h3> |
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| 67 | <ul> |
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| 68 | <li><a class="reference external" href="#">Layer Tree Tutorial</a><ul> |
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| 69 | <li><a class="reference external" href="#start-with-a-map">Start With a Map</a></li> |
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| 70 | <li><a class="reference external" href="#filtering">Filtering</a></li> |
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| 71 | <li><a class="reference external" href="#visibility-grouping">Visibility Grouping</a></li> |
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| 72 | <li><a class="reference external" href="#layer-nodes-with-additional-radio-buttons">Layer Nodes with Additional Radio Buttons</a></li> |
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| 73 | <li><a class="reference external" href="#sub-layers">Sub-Layers</a></li> |
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| 74 | </ul> |
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| 75 | </li> |
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| 76 | </ul> |
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| 77 | |
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| 78 | <h4>Previous topic</h4> |
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| 79 | <p class="topless"><a href="mappanel-tutorial.html" |
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| 80 | title="previous chapter"><tt class="docutils literal"><span class="pre">MapPanel</span></tt> Tutorial</a></p> |
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| 81 | <h4>Next topic</h4> |
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| 82 | <p class="topless"><a href="control-button-tutorial.html" |
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| 83 | title="next chapter">Map Tool Tutorial</a></p> |
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| 91 | <div class="body"> |
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| 92 | |
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| 93 | <div class="section" id="layer-tree-tutorial"> |
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| 94 | <h1>Layer Tree Tutorial<a class="headerlink" href="#layer-tree-tutorial" title="Permalink to this headline">¶</a></h1> |
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| 95 | <p>Often when presenting users with an interactive map, it is useful to allow them |
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| 96 | to control the visible layers. In this tutorial, we examine the use of |
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| 97 | <a title="GeoExt.tree.LayerContainer" class="reference external" href="../lib/GeoExt/widgets/tree/LayerContainer.html#GeoExt.tree.LayerContainer"><tt class="xref docutils literal"><span class="pre">GeoExt.tree.LayerContainer</span></tt></a> with the stock <tt class="docutils literal"><span class="pre">Ext.tree.TreePanel</span></tt> class |
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| 98 | to accommodate toggling visibility of layers and rearranging their drawing |
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| 99 | order.</p> |
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| 100 | <div class="admonition note"> |
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| 101 | <p class="first admonition-title">Note</p> |
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| 102 | <p class="last">Before starting this tutorial, you should have a working |
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| 103 | <a title="GeoExt.MapPanel" class="reference external" href="../lib/GeoExt/widgets/MapPanel.html#GeoExt.MapPanel"><tt class="xref docutils literal"><span class="pre">GeoExt.MapPanel</span></tt></a> in your page. The <a class="reference external" href="mappanel-tutorial.html"><em>MapPanel Tutorial</em></a> will |
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| 104 | help you set one up if you don’t already have one.</p> |
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| 105 | </div> |
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| 106 | <div class="section" id="start-with-a-map"> |
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| 107 | <h2>Start With a Map<a class="headerlink" href="#start-with-a-map" title="Permalink to this headline">¶</a></h2> |
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| 108 | <p>Let’s assume you already have a <a title="GeoExt.MapPanel" class="reference external" href="../lib/GeoExt/widgets/MapPanel.html#GeoExt.MapPanel"><tt class="xref docutils literal"><span class="pre">GeoExt.MapPanel</span></tt></a> on your page with some |
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| 109 | layers. In the <a class="reference external" href="mappanel-tutorial.html"><em>MapPanel Tutorial</em></a>, we discussed how you can use the |
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| 110 | <tt class="docutils literal"><span class="pre">layers</span></tt> property of the <tt class="docutils literal"><span class="pre">MapPanel</span></tt> to add, remove, and modify the layers of |
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| 111 | the map as well as monitor the layer list for changes. This is more than |
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| 112 | sufficient to display a ‘live’ list of layers in an <tt class="docutils literal"><span class="pre">Ext.grid.GridPanel</span></tt>. |
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| 113 | The <a title="GeoExt.tree.LayerContainer" class="reference external" href="../lib/GeoExt/widgets/tree/LayerContainer.html#GeoExt.tree.LayerContainer"><tt class="xref docutils literal"><span class="pre">GeoExt.tree.LayerContainer</span></tt></a> is another component that can listen to |
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| 114 | changes to the map’s layer list. However, rather than an independent panel, the |
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| 115 | <tt class="docutils literal"><span class="pre">LayerContainer</span></tt> is a node that must be contained in an <tt class="docutils literal"><span class="pre">Ext.tree.TreePanel</span></tt> |
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| 116 | to be displayed. Here’s an example rendering a layer tree to a <tt class="docutils literal"><span class="pre">div</span></tt>:</p> |
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| 117 | <div class="highlight-javascript"><div class="highlight"><pre><span class="kd">var</span> <span class="nx">mapPanel</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">GeoExt</span><span class="p">.</span><span class="nx">MapPanel</span><span class="p">({</span> |
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| 118 | <span class="cm">/* Your configuration here */</span> |
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| 119 | <span class="p">});</span> |
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| 120 | |
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| 121 | <span class="kd">var</span> <span class="nx">layerList</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">GeoExt</span><span class="p">.</span><span class="nx">tree</span><span class="p">.</span><span class="nx">LayerContainer</span><span class="p">({</span> |
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| 122 | <span class="nx">text</span><span class="o">:</span> <span class="s1">'All Layers'</span><span class="p">,</span> |
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| 123 | <span class="nx">layerStore</span><span class="o">:</span> <span class="nx">mapPanel</span><span class="p">.</span><span class="nx">layers</span><span class="p">,</span> |
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| 124 | <span class="nx">leaf</span><span class="o">:</span> <span class="kc">false</span><span class="p">,</span> |
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| 125 | <span class="nx">expanded</span><span class="o">:</span> <span class="kc">true</span> |
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| 126 | <span class="p">});</span> |
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| 127 | |
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| 128 | <span class="kd">var</span> <span class="nx">layerTree</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">Ext</span><span class="p">.</span><span class="nx">tree</span><span class="p">.</span><span class="nx">TreePanel</span><span class="p">({</span> |
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| 129 | <span class="nx">title</span><span class="o">:</span> <span class="s1">'Map Layers'</span><span class="p">,</span> |
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| 130 | <span class="nx">renderTo</span><span class="o">:</span> <span class="s1">'layerTree'</span><span class="p">,</span> |
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| 131 | <span class="nx">root</span><span class="o">:</span> <span class="nx">layerList</span> |
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| 132 | <span class="p">});</span> |
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| 133 | </pre></div> |
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| 134 | </div> |
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| 135 | <p><tt class="docutils literal"><span class="pre">LayerContainer</span></tt>s automatically add checkboxes (radio buttons for base |
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| 136 | layers) that can be used to toggle the visibility of layers. You can also enable |
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| 137 | drag-n-drop layer reordering by simply setting the <tt class="docutils literal"><span class="pre">enableDD</span></tt> property of the |
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| 138 | <tt class="docutils literal"><span class="pre">TreePanel</span></tt>.</p> |
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| 139 | </div> |
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| 140 | <div class="section" id="filtering"> |
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| 141 | <h2>Filtering<a class="headerlink" href="#filtering" title="Permalink to this headline">¶</a></h2> |
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| 142 | <p>By default, the <tt class="docutils literal"><span class="pre">LayerContainer</span></tt>‘s <tt class="docutils literal"><span class="pre">LayerLoader</span></tt> automatically pulls in all layers from the store and displays those with the <tt class="docutils literal"><span class="pre">displayInLayerSwitcher</span></tt> |
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| 143 | property set to true. You can provide your own filter function to the loader:</p> |
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| 144 | <div class="highlight-javascript"><div class="highlight"><pre><span class="kd">var</span> <span class="nx">layerList</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">GeoExt</span><span class="p">.</span><span class="nx">tree</span><span class="p">.</span><span class="nx">LayerContainer</span><span class="p">({</span> |
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| 145 | <span class="nx">text</span><span class="o">:</span> <span class="s1">'Tasmania Layers'</span><span class="p">,</span> |
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| 146 | <span class="nx">layerStore</span><span class="o">:</span> <span class="nx">mapPanel</span><span class="p">.</span><span class="nx">layers</span><span class="p">,</span> |
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| 147 | <span class="nx">leaf</span><span class="o">:</span> <span class="kc">false</span><span class="p">,</span> |
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| 148 | <span class="nx">expanded</span><span class="o">:</span> <span class="kc">true</span><span class="p">,</span> |
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| 149 | <span class="nx">loader</span><span class="o">:</span> <span class="p">{</span> |
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| 150 | <span class="nx">filter</span><span class="o">:</span> <span class="kd">function</span><span class="p">(</span><span class="nx">record</span><span class="p">)</span> <span class="p">{</span> |
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| 151 | <span class="k">return</span> <span class="nx">record</span><span class="p">.</span><span class="nx">get</span><span class="p">(</span><span class="s2">"layer"</span><span class="p">).</span><span class="nx">name</span><span class="p">.</span><span class="nx">indexOf</span><span class="p">(</span><span class="s2">"Tasmania"</span><span class="p">)</span> <span class="o">!==</span> <span class="o">-</span><span class="mi">1</span> |
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| 152 | <span class="p">}</span> |
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| 153 | <span class="p">}</span> |
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| 154 | <span class="p">});</span> |
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| 155 | </pre></div> |
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| 156 | </div> |
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| 157 | <p>The above will only load layers with “Tasmania” in their name. By adding |
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| 158 | multiple named and filtered <tt class="docutils literal"><span class="pre">LayerContainer</span></tt>s to a <tt class="docutils literal"><span class="pre">TreePanel</span></tt> you are |
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| 159 | able to provide logical organization to your layer trees. When <tt class="docutils literal"><span class="pre">enableDD</span></tt> is |
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| 160 | set to true on the tree, drag-n-drop will also work between filtered layer |
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| 161 | containers, as long as they have the same parent node. You can also directly |
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| 162 | instantiate <a title="GeoExt.tree.LayerNode" class="reference external" href="../lib/GeoExt/widgets/tree/LayerNode.html#GeoExt.tree.LayerNode"><tt class="xref docutils literal"><span class="pre">GeoExt.tree.LayerNode</span></tt></a> to create tree nodes that can be |
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| 163 | added anywhere in a tree. Keep in mind, however, that this approach does not |
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| 164 | allow for automatic drag-n-drop support.</p> |
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| 165 | <div class="admonition note"> |
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| 166 | <p class="first admonition-title">Note</p> |
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| 167 | <p>There are two LayerContainer types with a preconfigured filter:</p> |
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| 168 | <ul class="last simple"> |
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| 169 | <li><a title="GeoExt.tree.BaseLayerContainer" class="reference external" href="../lib/GeoExt/widgets/tree/BaseLayerContainer.html#GeoExt.tree.BaseLayerContainer"><tt class="xref docutils literal"><span class="pre">GeoExt.tree.BaseLayerContainer</span></tt></a> will be populated only with layers |
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| 170 | that have isBaseLayer set to true,</li> |
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| 171 | <li><a title="GeoExt.tree.OverlayLayerContainer" class="reference external" href="../lib/GeoExt/widgets/tree/OverlayLayerContainer.html#GeoExt.tree.OverlayLayerContainer"><tt class="xref docutils literal"><span class="pre">GeoExt.tree.OverlayLayerContainer</span></tt></a> will be populated only with |
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| 172 | layers that have isBaseLayer set to false.</li> |
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| 173 | </ul> |
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| 174 | </div> |
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| 175 | </div> |
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| 176 | <div class="section" id="visibility-grouping"> |
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| 177 | <h2>Visibility Grouping<a class="headerlink" href="#visibility-grouping" title="Permalink to this headline">¶</a></h2> |
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| 178 | <p>The concept of a base layer in OpenLayers is just a gruop of layers that are on |
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| 179 | the bottom of the layer stack, and only one can be visible at a time. In maps |
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| 180 | without base layers (when <tt class="docutils literal"><span class="pre">allOverlays</span></tt> is set to true, the latter can be |
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| 181 | enforced by configuring a <tt class="docutils literal"><span class="pre">checkedGroup</span></tt> on a LayerNode. Such a layer node |
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| 182 | will be rendered with a radio button instead of a check box. Of all layers |
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| 183 | configured with the same <tt class="docutils literal"><span class="pre">checkedGroup</span></tt>, only one will be visible at a time:</p> |
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| 184 | <div class="highlight-javascript"><div class="highlight"><pre><span class="kd">var</span> <span class="nx">layerList</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">GeoExt</span><span class="p">.</span><span class="nx">tree</span><span class="p">.</span><span class="nx">LayerContainer</span><span class="p">({</span> |
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| 185 | <span class="nx">text</span><span class="o">:</span> <span class="s1">'Tasmania Layers'</span><span class="p">,</span> |
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| 186 | <span class="nx">layerStore</span><span class="o">:</span> <span class="nx">mapPanel</span><span class="p">.</span><span class="nx">layers</span><span class="p">,</span> |
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| 187 | <span class="nx">leaf</span><span class="o">:</span> <span class="kc">false</span><span class="p">,</span> |
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| 188 | <span class="nx">expanded</span><span class="o">:</span> <span class="kc">true</span><span class="p">,</span> |
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| 189 | <span class="nx">loader</span><span class="o">:</span> <span class="p">{</span> |
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| 190 | <span class="nx">filter</span><span class="o">:</span> <span class="kd">function</span><span class="p">(</span><span class="nx">record</span><span class="p">)</span> <span class="p">{</span> |
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| 191 | <span class="k">return</span> <span class="nx">record</span><span class="p">.</span><span class="nx">get</span><span class="p">(</span><span class="s2">"layer"</span><span class="p">).</span><span class="nx">name</span><span class="p">.</span><span class="nx">indexOf</span><span class="p">(</span><span class="s2">"Tasmania"</span><span class="p">)</span> <span class="o">!==</span> <span class="o">-</span><span class="mi">1</span> |
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| 192 | <span class="p">},</span> |
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| 193 | <span class="nx">baseAttrs</span><span class="o">:</span> <span class="p">{</span> |
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| 194 | <span class="nx">checkedGroup</span><span class="o">:</span> <span class="s2">"tasmania"</span> |
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| 195 | <span class="p">}</span> |
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| 196 | <span class="p">}</span> |
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| 197 | <span class="p">});</span> |
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| 198 | </pre></div> |
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| 199 | </div> |
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| 200 | </div> |
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| 201 | <div class="section" id="layer-nodes-with-additional-radio-buttons"> |
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| 202 | <h2>Layer Nodes with Additional Radio Buttons<a class="headerlink" href="#layer-nodes-with-additional-radio-buttons" title="Permalink to this headline">¶</a></h2> |
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| 203 | <p>It is possible to render layer nodes with an additional radio button. This can |
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| 204 | be useful if an application uses the concept of an “active layer”. The active |
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| 205 | layer can then be set by clicking its radio button:</p> |
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| 206 | <div class="highlight-javascript"><div class="highlight"><pre><span class="kd">var</span> <span class="nx">layerList</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">GeoExt</span><span class="p">.</span><span class="nx">tree</span><span class="p">.</span><span class="nx">LayerContainer</span><span class="p">({</span> |
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| 207 | <span class="nx">text</span><span class="o">:</span> <span class="s1">'All Layers'</span><span class="p">,</span> |
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| 208 | <span class="nx">layerStore</span><span class="o">:</span> <span class="nx">mapPanel</span><span class="p">.</span><span class="nx">layers</span><span class="p">,</span> |
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| 209 | <span class="nx">leaf</span><span class="o">:</span> <span class="kc">false</span><span class="p">,</span> |
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| 210 | <span class="nx">expanded</span><span class="o">:</span> <span class="kc">true</span><span class="p">,</span> |
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| 211 | <span class="nx">loader</span><span class="o">:</span> <span class="p">{</span> |
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| 212 | <span class="nx">baseAttrs</span><span class="o">:</span> <span class="p">{</span> |
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| 213 | <span class="nx">radioGroup</span><span class="o">:</span> <span class="s2">"active"</span> |
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| 214 | <span class="p">}</span> |
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| 215 | <span class="p">}</span> |
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| 216 | <span class="p">});</span> |
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| 217 | <span class="kd">var</span> <span class="nx">registerRadio</span> <span class="o">=</span> <span class="kd">function</span><span class="p">(</span><span class="nx">node</span><span class="p">)</span> |
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| 218 | <span class="k">if</span><span class="p">(</span><span class="o">!</span><span class="nx">node</span><span class="p">.</span><span class="nx">hasListener</span><span class="p">(</span><span class="s2">"radiochange"</span><span class="p">))</span> <span class="p">{</span> |
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| 219 | <span class="nx">node</span><span class="p">.</span><span class="nx">on</span><span class="p">(</span><span class="s2">"radiochange"</span><span class="p">,</span> <span class="kd">function</span><span class="p">(</span><span class="nx">node</span><span class="p">){</span> |
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| 220 | <span class="cm">/* set your active layer here */</span> |
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| 221 | <span class="p">});</span> |
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| 222 | <span class="p">}</span> |
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| 223 | <span class="p">}</span> |
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| 224 | <span class="kd">var</span> <span class="nx">layerTree</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">Ext</span><span class="p">.</span><span class="nx">tree</span><span class="p">.</span><span class="nx">TreePanel</span><span class="p">({</span> |
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| 225 | <span class="nx">title</span><span class="o">:</span> <span class="s1">'Map Layers'</span><span class="p">,</span> |
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| 226 | <span class="nx">renderTo</span><span class="o">:</span> <span class="s1">'layerTree'</span><span class="p">,</span> |
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| 227 | <span class="nx">root</span><span class="o">:</span> <span class="nx">layerList</span><span class="p">,</span> |
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| 228 | <span class="nx">listeners</span><span class="o">:</span> <span class="p">{</span> |
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| 229 | <span class="nx">append</span><span class="o">:</span> <span class="nx">registerRadio</span><span class="p">,</span> |
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| 230 | <span class="nx">insert</span><span class="o">:</span> <span class="nx">registerRadio</span> |
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| 231 | <span class="p">}</span> |
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| 232 | <span class="p">});</span> |
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| 233 | </pre></div> |
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| 234 | </div> |
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| 235 | <p>The layer node fires the “radiochange” event when the radio button is clicked. |
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| 236 | The above snippet configures a listener for this event when a node is added to |
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| 237 | or inserted in the tree.</p> |
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| 238 | </div> |
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| 239 | <div class="section" id="sub-layers"> |
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| 240 | <h2>Sub-Layers<a class="headerlink" href="#sub-layers" title="Permalink to this headline">¶</a></h2> |
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| 241 | <p>Layers that have a <tt class="docutils literal"><span class="pre">params</span></tt> property (like <tt class="docutils literal"><span class="pre">OpenLayers.Layer.WMS</span></tt>) can be |
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| 242 | used to create sub-layers based on one of the <tt class="docutils literal"><span class="pre">params</span></tt> properties. This is |
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| 243 | useful to e.g. create sub-nodes from the layer object’s “LAYERS” or “CQL_FILTER” |
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| 244 | param:</p> |
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| 245 | <div class="highlight-javascript"><div class="highlight"><pre><span class="kd">var</span> <span class="nx">groupLayer</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">OpenLayers</span><span class="p">.</span><span class="nx">Layer</span><span class="p">.</span><span class="nx">WMS</span><span class="p">(</span><span class="s2">"Tasmania (Group Layer)"</span><span class="p">,</span> |
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| 246 | <span class="s2">"http://demo.opengeo.org/geoserver/wms"</span><span class="p">,</span> <span class="p">{</span> |
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| 247 | <span class="nx">layers</span><span class="o">:</span> <span class="p">[</span> |
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| 248 | <span class="s2">"topp:tasmania_state_boundaries"</span><span class="p">,</span> |
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| 249 | <span class="s2">"topp:tasmania_water_bodies"</span><span class="p">,</span> |
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| 250 | <span class="s2">"topp:tasmania_cities"</span><span class="p">,</span> |
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| 251 | <span class="s2">"topp:tasmania_roads"</span> |
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| 252 | <span class="p">],</span> |
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| 253 | <span class="nx">transparent</span><span class="o">:</span> <span class="kc">true</span><span class="p">,</span> |
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| 254 | <span class="nx">format</span><span class="o">:</span> <span class="s2">"image/gif"</span> |
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| 255 | <span class="p">}</span> |
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| 256 | <span class="p">);</span> |
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| 257 | <span class="kd">var</span> <span class="nx">groupLayerNode</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">GeoExt</span><span class="p">.</span><span class="nx">tree</span><span class="p">.</span><span class="nx">LayerNode</span><span class="p">({</span> |
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| 258 | <span class="nx">layer</span><span class="o">:</span> <span class="nx">groupLayer</span><span class="p">,</span> |
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| 259 | <span class="nx">leaf</span><span class="o">:</span> <span class="kc">false</span><span class="p">,</span> |
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| 260 | <span class="nx">expanded</span><span class="o">:</span> <span class="kc">true</span><span class="p">,</span> |
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| 261 | <span class="nx">loader</span><span class="o">:</span> <span class="p">{</span> |
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| 262 | <span class="nx">param</span><span class="o">:</span> <span class="s2">"LAYERS"</span> |
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| 263 | <span class="p">}</span> |
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| 264 | <span class="p">});</span> |
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| 265 | </pre></div> |
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| 266 | </div> |
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| 267 | <div class="admonition note"> |
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| 268 | <p class="first admonition-title">Note</p> |
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| 269 | <p class="last">The <a title="GeoExt.tree.LayerParamLoader" class="reference external" href="../lib/GeoExt/widgets/tree/LayerParamLoader.html#GeoExt.tree.LayerParamLoader"><tt class="xref docutils literal"><span class="pre">GeoExt.tree.LayerParamLoader</span></tt></a> does not add drag-n-drop support |
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| 270 | to the sub-nodes it creates, so <tt class="docutils literal"><span class="pre">allowDrag</span></tt> and <tt class="docutils literal"><span class="pre">allowDrag</span></tt> should be |
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| 271 | set to false for a <a title="GeoExt.tree.LayerNode" class="reference external" href="../lib/GeoExt/widgets/tree/LayerNode.html#GeoExt.tree.LayerNode"><tt class="xref docutils literal"><span class="pre">GeoExt.tree.LayerNode</span></tt></a> configured with a |
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| 272 | <tt class="xref docutils literal"><span class="pre">GeoExt.class.LayerParamLoader</span></tt>, unless you provide custom “move” |
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| 273 | handlers.</p> |
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| 274 | </div> |
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| 275 | <div class="admonition-see-also admonition seealso"> |
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| 276 | <p class="first admonition-title">See also</p> |
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| 277 | <p class="last">The ExtJS TreePanel <a class="reference external" href="http://dev.sencha.com/deploy/dev/docs/?class=Ext.tree.TreePanel">documentation</a> and <a class="reference external" href="http://dev.sencha.com/deploy/dev/examples/#sample-7">examples</a> for more |
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| 278 | information about customizing tree panels.</p> |
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| 279 | </div> |
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| 280 | </div> |
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| 281 | </div> |
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| 282 | |
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| 283 | |
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| 284 | </div> |
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| 285 | </div> |
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| 286 | </div> |
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| 287 | <div class="clearer"></div> |
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| 288 | </div> |
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| 289 | <div class="related"> |
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| 290 | <h3>Navigation</h3> |
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| 291 | <ul> |
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| 292 | <li class="right" style="margin-right: 10px"> |
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| 293 | <a href="../genindex.html" title="General Index" |
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| 294 | accesskey="I">index</a></li> |
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| 295 | <li class="right" > |
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| 296 | <a href="../modindex.html" title="Global Module Index" |
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| 297 | accesskey="M">modules</a> |</li> |
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| 298 | <li class="right" > |
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| 299 | <a href="control-button-tutorial.html" title="Map Tool Tutorial" |
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| 300 | accesskey="N">next</a> |</li> |
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| 301 | <li class="right" > |
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| 302 | <a href="mappanel-tutorial.html" title="MapPanel Tutorial" |
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| 303 | accesskey="P">previous</a> |</li> |
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| 304 | <li><a href="../index.html">GeoExt</a> »</li> |
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| 305 | <li><a href="index.html" >Tutorials</a> »</li> |
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| 306 | <li><a href="#">Layer Tree Tutorial</a></li> |
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| 307 | </ul> |
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| 308 | </div> |
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| 309 | |
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| 310 | <div class="footer"> |
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| 311 | © Copyright 2009-2010, GeoExt Community. |
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| 312 | </div> |
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