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https://issues.apache.org/jira/browse/FLEX-33796?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14512633#comment-14512633
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Ibrahim Beliki commented on FLEX-33796:
---------------------------------------
For those who'll use this code in the future, the bug can be fixed by replacing
"super.dataProvider = value" with super.dataProvider = new
ArrayCollection(value.toArray())"
That's because when we call the set function of dataProvider, and then
textInput_changeHandler is called, refreshing is done to unfilteredDataProvider
which still has as the same reference as super.dataProvider. Therefore,
super.dataProvider is refreshed.
refreshing dataProvider calls an mx_internal function which causes the problem
that we have. (I think that it's called mx_internal function
dataProviderChanged , it's located in ListBase.as)
Hope that'll be helpful.
> combobox filters dataprovider on user input
> -------------------------------------------
>
> Key: FLEX-33796
> URL: https://issues.apache.org/jira/browse/FLEX-33796
> Project: Apache Flex
> Issue Type: Bug
> Components: Spark: ComboBox
> Reporter: Kiran Kumar Potnuru
>
> I have a ComboBox and the data provider is an Array Collection of 3 values:
> CA - California, NY - New York, TX - Texas. With the default behavior when I
> start typing in the ComboBox it will try to match the value from the
> beginning of the string, so if I start Typing TX it will bring up TX - Texas.
> I want to be able to search at any part of the string and not just from the
> beginning, so if I type "xas" it will filter out the selection and only show
> TX - Texas. There is a very helpful post in the Adobe forums here on how to
> do this by changing the filter function on the Array Collection which
> provides data for the ComboBox and I have adapted it but I am having a slight
> issue with it.
> If a user selects a value and then tries to enter in new text the first
> letter typed in the ComboBox does not show up.
> 1) Select the value CA - California in the ComboBox 2) Highlight the text and
> hit "n" on your keyboard 3) You would expect to see the text box populated
> with "n" but the text box remains empty
> What could be causing this issue? It only happens if you already have a value
> selected. If you start with a blank ComboBox it works as expected.
> <?xml version="1.0" encoding="utf-8"?>
> <s:ComboBox xmlns:fx="http://ns.adobe.com/mxml/2009";
> xmlns:s="library://ns.adobe.com/flex/spark"
> xmlns:mx="library://ns.adobe.com/flex/mx">
> <fx:Script>
> <![CDATA[
> import mx.collections.ArrayCollection;
> import mx.collections.IList;
> import spark.events.TextOperationEvent;
> private var unfilteredDataProvider : IList;
>
> override public function set dataProvider(value:IList):void
> {
> super.dataProvider = value;
> unfilteredDataProvider = value;
> }
> override protected function
> textInput_changeHandler(event:TextOperationEvent):void
> {
> super.textInput_changeHandler(event);
> if (unfilteredDataProvider is ArrayCollection)
> {
> ArrayCollection(unfilteredDataProvider).filterFunction =
> filterMatches;
> ArrayCollection(unfilteredDataProvider).refresh();
> super.dataProvider = new
> ArrayCollection(unfilteredDataProvider.toArray());
> }
> }
> protected function filterMatches(item:Object):Boolean
> {
> if (item is String)
> {
> if(String(item).toLowerCase().indexOf(
> textInput.text.slice(0,
> textInput.selectionAnchorPosition).toLowerCase())>-1)
> return true;
> }
> else if (labelField && labelField != "")
> {
> if(item.hasOwnProperty(labelField) &&
> String(item[labelField]).toLowerCase().indexOf(
> textInput.text.slice(0,
> textInput.selectionAnchorPosition).toLowerCase())>-1)
> return true;
> }
> return false;
> }
> ]]>
> </fx:Script>
> </s:ComboBox>
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