jquery - jQueryUI - auto scroll goes double distance when dragging

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jquery - jQueryUI - auto scroll goes double distance when dragging

asked Jan 31, 2022 in Technique[技术] by 深蓝 (71.8m points)

jquery - jQueryUI - auto scroll goes double distance when dragging

I've distilled the problem into the shortest page which exhibits the problem (apologies for inline style).

If you scroll down and drag the 'drag me' title, look how the dragged element zooms away from the cursor. It seems to be moving double the distance (relative to the document) than it needs to.

I have reproduced the problem in IE8, FF3.5 and Chrome. On WinXP and Ubuntu.

Am I doing something stupid in my code, or have I encountered a bug?

Thanks,

Chris.

<!DOCTYPE html>
<html>
<head>
    <script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.4.4/jquery.min.js"></script>
    <script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jqueryui/1.8.7/jquery-ui.min.js"></script>
    <script type="text/javascript">
        $(document).ready(function() {
            $(".draggable").draggable();
        });    
    </script>
</head>
<body>
<div style="width: 100px; height: 800px; background: green;">
</div>
<h1 class="draggable">drag me</h1>
<div style="width: 100px; height: 800px; background: green;">
</div>
</body>
</html>

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1 Answer

深蓝 · Answer 1 · 2022-01-31T07:05:51+0000

For me you've found a bug :)
It works fine until the mouse cursor stays inside the visible area... then the H1 enable the hyperdrive :D
To reduce (but not to avoid completely) the bug's effects you can restrict the draggable area into e tag (eg. body) AND disable the scroll:


            $(".draggable").draggable();
            $(".draggable" ).draggable( "option", "containment",  'body' );
            $(".draggable" ).draggable(  "option", "scroll" , false  );

or an arbitrary area (other option in docs):


            var area=Array(0,740,300,880);
            $(".draggable").draggable();
            $(".draggable" ).draggable( "option", "containment",  area );
            $(".draggable" ).draggable(  "option", "scroll" , false  );

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jquery - jQueryUI - auto scroll goes double distance when dragging

jquery - jQueryUI - auto scroll goes double distance when dragging

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