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POFilteringSelect with a QueryReadStore: selection doesn't stick
 

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  1. POFilteringSelect with a QueryReadStore: selection doesn't stick
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    <p>I am using a <code>dijit.form.FilteringSelect</code> backed by a <code>dojox.data.QueryReadStore</code> in order to allow the user to select a region (think "auto-complete" mechanism). On each character entered by the user, the <code>QueryReadStore</code> sends a request to the server, awaiting a json list of matching regions (with associated IDs). By the time a short enough list is shown, the user picks the desired item. [Admittedly, querying on every keystroke is not the most efficient pattern, but it's good enough for now.]</p> <p>Unexpected behaviour: in some rare but specific occasions, the choice made by the user "doesn't stick". For instance, if the user types "<code>can</code>", she is presented with the following choices in that order:</p> <pre><code>Atlantic Canada Canada English Canada Lower Canada Upper Canada Western Canada </code></pre> <p>If she chooses "<code>Canada</code>" among these, the dijit closes the drop down selection, having correctly selected her choice. But by the time the user leaves the field, the selection switches to "<code>Atlantic Canada</code>"!</p> <p>That bizarre phenomenon occurs systematically for a small number of specific regions. (At first, I thought that the common factor between those badly behaved regions was that their name contained accented characters or hyphens, but clearly not so with the Canadian example. So far, I fail to spot a regular pattern.)</p> <p>I have not found any mention of a similar problem anywhere. I am quite willing to investigate, but, as I am new to dojo, I would really appreciate pointers before I resort to delving inside dojo's code: where should I first look? what are some likely problems that could cause that behaviour? can i rule out certain hypotheses? how should I best use the console (or Firebug) to get to the bottom of this? etc.</p> <p>The problem occurs with both dojo 1.1.1 and dojo 1.2.3.</p> <p>Here is the (programmatic) generation of the <code>FilteringSelect</code>:</p> <pre><code>new dijit.form.FilteringSelect({ name = "region"; autoComplete = false; hasDownArrow = false; labelAttr = "name"; queryExpr = "${0}"; store = new dojox.data.QueryReadStore({url:'/query/regions'}); }, myNode); </code></pre> <p><strong>EDIT (2009/02/18): Additional details</strong></p> <p>Following damelin's answer, I wanted to understand what <code>FilteringSelect</code> saw of this situation. Suppose I connect logging functions to the <code>FilteringSelect</code>'s events <code>onChange</code> and <code>onBlur</code>, I get the following play-by-play sequence:</p> <ul> <li>I click in the field and type: <code>can</code></li> <li>drop-down list of 6 regions (listed above) appears</li> <li>with the keyboard cursors, I move down the list to "<code>Canada</code>" (which is region with id 1)</li> <li><p>I press <code>Enter</code> (thus <strong>selecting</strong> an item of the store). The drop-down list has by now disappeared and the text "<code>Canada</code>" appears in the field. At this point, the first event is fired, with the following logging:</p> <pre><code>onChange event: region 1 </code></pre></li> <li><p>I leave the field by pressing <code>tab</code>. Here, two events are fired one after the other, in the following order:</p> <pre><code>onBlur event: region 1 onChange event: region 246 </code></pre></li> </ul> <p>(Region 246 is <code>Atlantic Canada</code>.) Now that's very interesting... By the time I leave the field (onBlur), <code>Canada</code> still is the selected value. The mysterious swap happens only after that...</p>
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