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POWhy are black squares appearing in Chrome?
 

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  1. POWhy are black squares appearing in Chrome?
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    <p>I'm developing an application in ExtJS 4.2.0 and using Chrome as my development browser. I've noticed that when I hide dropdown menus black squares appear in their place. I'm assuming this isn't supposed to happen! Has anyone else experienced this?</p> <p>I'm using ExtJs 4.2.0 and Chrome 27.0.1453.94 m.</p> <p>Thanks!</p> <h1>UPDATE</h1> <p>After some investigation I've found that it happens when using ExtJS in conjunction with the Javascript Infovis Toolkit (<a href="http://philogb.github.io/jit/" rel="nofollow">http://philogb.github.io/jit/</a>). I've managed to recreate the problem reliably here:</p> <pre><code>&lt;html&gt; &lt;head&gt; &lt;title&gt;Black Box Experiment&lt;/title&gt; &lt;script type="text/javascript" src="http://philogb.github.io/jit/static/v20/Jit/jit-yc.js"&gt;&lt;/script&gt; &lt;link rel="stylesheet" type="text/css" href="http://cdn.sencha.io/ext-4.2.0-gpl/resources/css/ext-all.css"&gt; &lt;script type="text/javascript" src="http://cdn.sencha.io/ext-4.2.0-gpl/ext-all-debug.js"&gt;&lt;/script&gt; &lt;/head&gt; &lt;body&gt; &lt;script type="text/javascript"&gt; Ext.onReady(function(){ //some data to put in the chart var data = { "name": "Test1", "data": { "id": "1" } }; //Create a new ST instance var st = new $jit.ST({ injectInto: 'infovis', duration: 0, levelDistance: 50, orientation: "top", Navigation: { enable:false, panning:true }, Node: { height: 30, width: 150, autoHeight: false, autoWidth: false, type: 'rectangle', overridable: true }, NodeStyles: { enable: true, stylesHover: { 'color': '#dd3333' }, duration: 700 }, Edge: { type: 'bezier', overridable: true } }); //load json data st.loadJSON(data); st.compute(); //emulate a click on the root node. st.onClick(st.root); //create our extjs panel for the buttons Ext.create(Ext.panel.Panel,{ title: "Test panel", width: 300, height: 100, items: [ { xtype: 'button', text: 'Open/Close Menu', menu: [ {text: 'button 1'}, {text: 'button 2'}, {text: 'button 3'}, {text: 'button 4'}, {text: 'button 5'}, {text: 'button 6'} ] }, { xtype: 'button', text: 'Click to open an alert - a black square will appear', handler: function(){ Ext.Msg.alert("Test","A black box should now be appearing where the menu button is."); } } ], renderTo: Ext.getBody() }); }); &lt;/script&gt; &lt;div id="infovis" style="width: 300px; height: 300px; margin: auto; overflow: scroll; border: 1px solid black;"&gt;&lt;/div&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>In the example above, take the following steps to recreate the problem: 1. Click on the "Open/Close Menu" button twice (once to open, once to close) 2. Click on the "Alert" button. A black box should appear in the position of the menu that we've just closed.</p> <p>Does anyone else see this?</p>
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      1. USErnesto Vallejo García
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    1. COWithout code to test it is likely a moderator will close this question.
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    2. COOK, I will try to create a test case for this - it's part of quite a complicated app so I can't just paste it all in. However it is literally just closing a normal everyday menu that causes the problem, and it works absolutely fine on other browsers (FF, IE, Opera). It even works fine on versions of Chrome up to 26. I think it's probably a browser issue...
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    3. COI've seen similar during javascript animations on mobile chrome (on android), but only *during* the animation - they don't persist afterwards... interested to see if you can reproduce this consistently.
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      1. USEd Hinchliffe
 

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