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(not) display rows with 0 value with Unique Value Renderer

deleted-user-3QvhwBivZdaR

I am working on a web app using ArcGISDynamicMapServiceLayers, which use UniqueValueRenderers to draw points based on attributes. In many cases, the attribute value is 0, in which cases I would not want to display anything. If I do not assign some symbol to these values, the service draws the default symbol in those locations. I tried assigning a symbol with 0 opacity (transparent), but when I use an InfoWindow in the web app, a click will still [pick up these invisible symbols.

Is there a way that I can not draw these symbols at all if the attribute value is 0?

The user will choose which attribute to use for rendering the symbols. So that value may be 0 in some cases and nonzero in others.

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Accepted answers

RobertScheitlin__GISP

Jason,

Your sample really helped. I did not know you where using the IdentifyTask and not just a simple InfoTemplate or PopupTemplate.

You need to apply the SQL definition to the IdentifyParamaters (lines 5 and 6).

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="comment token">// identify task</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">function</SPAN> <SPAN class="token function">executeIdentifyTask</SPAN><SPAN class="punctuation token">(</SPAN>event<SPAN class="punctuation token">)</SPAN> <SPAN class="punctuation token">{</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; identifyParams<SPAN class="punctuation token">.</SPAN>geometry <SPAN class="operator token">=</SPAN> event<SPAN class="punctuation token">.</SPAN>mapPoint<SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; identifyParams<SPAN class="punctuation token">.</SPAN>mapExtent <SPAN class="operator token">=</SPAN> map<SPAN class="punctuation token">.</SPAN>extent<SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; identifyParams<SPAN class="punctuation token">.</SPAN>layerDefinitions <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">[</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; identifyParams<SPAN class="punctuation token">.</SPAN>layerDefinitions<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN> <SPAN class="operator token">=</SPAN> attributeField <SPAN class="operator token">+</SPAN> <SPAN class="string token">'>0'</SPAN><SPAN class="punctuation token">;</SPAN><SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

All comments

deleted-user-3QvhwBivZdaR

I created a simple demo of my problem here: (note that I can only keep this up for a short time)

Change attribute used for a renderer

To demonstrate the problem I am having:

1) click on a point and see the info window, which will show the chosen attribute field and its value

2) remember where the current points are located, then, choose a different attribute from the dropdown window

3) now click on the same spot where a point no longer appears where it appeared earlier..you will see the current value of '0' in the info window

My goal is to remove these 'invisible' points entirely

Here is the code relevant to the renderer and the layer definitions:

var baseSymbol = new SimpleMarkerSymbol(SimpleMarkerSymbol.STYLE_CIRCLE, 15);
attributeField = document.getElementById("fieldNames").value; // these values correspond with attribute field names in layer
var renderer = new UniqueValueRenderer(baseSymbol, attributeField);

// the '0' value below makes the point invisible but does not remove point from the layer
renderer.addValue(0, new SimpleMarkerSymbol(SimpleMarkerSymbol.STYLE_CIRCLE, 6).setColor(new Color([255, 0, 0,0])));
renderer.addValue(1, new SimpleMarkerSymbol(SimpleMarkerSymbol.STYLE_CIRCLE, 6).setColor(new Color([255, 77, 77, 0.8])));
renderer.addValue(2, new SimpleMarkerSymbol(SimpleMarkerSymbol.STYLE_CIRCLE, 8).setColor(new Color([230, 0, 0, 0.8])));

............................

var optionsArray = [];
var drawingOptions = new LayerDrawingOptions();
drawingOptions.renderer = renderer;
optionsArray[0] = drawingOptions;
var layerDefs = [];
layerDefs[0] = attributeField + '>0';
// layerDefs[0] = 'All_9_12>0'; // use hard coded attribute field as test to see if layerDefs are applied, commented out for now
// imageParameters.layerDefinitions = layerDefs; // tried this an alternative method // replace line below for image parameters // had no effect
map.getLayer("layer").setLayerDefinitions(layerDefs); // test line above confirmed that this is being implemented
map.getLayer("layer").setLayerDrawingOptions(optionsArray);
demoLayer.setVisibleLayers([0], true);
map.getLayer("layer").show();

deleted-user-3QvhwBivZdaR

ok I will try that, thanks!

RobertScheitlin__GISP

Sure.

deleted-user-3QvhwBivZdaR

Can I do that after loading the map services? In other words, can I set the layer definition expression dynamically in runtime?

RobertScheitlin__GISP

Jason,

Why not set the layer definition expression to exclude those feature with the attribute value of 0?

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