Displaying scroll tips in a List control in Flex

The following example shows how you can display scroll tips in a Flex List control by setting the showScrollTips property. You can also customize the scroll tip text by setting a custom scroll tip function using the scrollTipFunction property.

Full code after the jump.


<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/03/28/displaying-scroll-tips-in-a-list-control-in-flex/ -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"

            import mx.controls.scrollClasses.ScrollBarDirection;
            import mx.utils.StringUtil;

            private function list_scrollTipFunc(dir:String, pos:Number):String {
                var pct:Number = pos / list.maxVerticalScrollPosition;
                return StringUtil.substitute("{0} / {1} ({2}%)",
                        pos, // current
                        list.maxVerticalScrollPosition, // max
                        numberFormatter.format(pct * 100) // percent

    <mx:NumberFormatter id="numberFormatter" precision="0" />

    <mx:Array id="arr">
        <mx:Object label="Accordion" />
        <mx:Object label="ApplicationControlBar" />
        <mx:Object label="Box" />
        <mx:Object label="Canvas" />
        <mx:Object label="ControlBar" />
        <mx:Object label="DividedBox" />
        <mx:Object label="Form" />
        <mx:Object label="FormHeading" />
        <mx:Object label="FormItem" />
        <mx:Object label="Grid" />
        <mx:Object label="HBox" />
        <mx:Object label="HDividedBox" />
        <mx:Object label="Panel" />
        <mx:Object label="TabNavigator" />
        <mx:Object label="Tile" />
        <mx:Object label="TitleWindow" />
        <mx:Object label="VBox" />
        <mx:Object label="VDividedBox" />
        <mx:Object label="ViewStack" />

    <mx:ApplicationControlBar dock="true">
        <mx:CheckBox id="checkBox"
                selected="true" />

    <mx:List id="list"
            verticalScrollPolicy="on" />


View source is enabled in the following example.

5 thoughts on “Displaying scroll tips in a List control in Flex

  1. Rafael,

    I see the scroll tip in the example above (using WinXP/FP9,0,115,0/IE7). It’s a little hard to see since it is actually over the List control itself.


  2. Hi Peter

    I am using a multiselect listbox how will I access the values in another page (ASP) selected when the page is submitted.

    Based on the selection I need to select some records from database.

    If you need the source code I will send it to you

    Arulmurugan . T
    Web Developer

  3. I think the confusion on the tooltip not showing isn’t that it isn’t showing (it is), but the expectations. I was initially expecting to see content tooltips as I moused over ‘TabNavigator’, ‘Tile’, etc. What this is doing is adding Tooltips to the scroll bar — which is exactly what it says it is doing… lol

  4. Hi,

    Is there a way to modify the style of the scrollTip?
    I would like to enlarge it and give it some transparency.
    Besides, I would prefer it it were located at the left-end side of the list (or datagrid or whatever).

    Many thanks in advance for your advice.

    Best regards,

Comments are closed.