Custom Resizable Handles in JQuery UI

问题

I've been attempting to create a resizable textbox (ASP.NET multiline TextBox / HTML textarea) and use JQuery UI to make it resizable, but seem to be running into a few issues involving custom drag handles.

The JQuery documentation on the Resizable method (specifically that on the handles option) suggests that I can set any of the handles to use a custom HTML element. I have managed to get the resizable textbox working perfectly well using the default resizable handles, but trying to set custom ones (i.e. an HTML element that I have defined in markup) creates the following issue: the resizable container leaves the correct amount of space for the div handle at the bottom (for the South handle), yet leaves the space empty and shows the element below (outside of) the resizable container (verified using Firebug).

Here is my markup (ASP.NET/XHTML) and JavaScript code:

<asp:TextBox runat="server" ID="codeTextBox" TextMode="MultiLine" Wrap="false" Rows="15">
</asp:TextBox>
<div class="resizable-s" style="width: 100%; height: 22px; background: red;">
</div>

<script type="text/javascript">

    $(function() {
        var codeTextBox = $("#<%= codeTextBox.ClientID %>");

        codeTextBox.resizable({
            handles: { s : $(".resizable-s") },
            minHeight: 80,
            maxHeight: 400
        });
    });

</script>

Of course, I can't make the resizable handle div (class resizable-s) a child of the TextBox/textarea, but this should not be a problem according to the JQuery docs.

Judging by the searching I've done, I'm not the only person who's had this problem. (Unfortunately, the JQuery docs fail to give an example of using custom resizable handles, so we're all left unsure of precisely the right code.) If anyone could suggest a fix to this, or indeed confirmation that it is a JQuery bug, that would be very much appreciated.

回答1:

From a bit of digging I did in the jquery-ui code, I think I can confirm that a custom handle outside the resizable element doesn't work.

The problem is that the mouse events are initialized for the resizable element (or a wrapper element in the case of textarea). If the handle is not a child of where the mouse events are handled, it won't trigger the mousedown event on the handle, thus not making it draggable.

As a proof of concept I patched around a bit in jquery-ui until I got things to (sort of) work. No guarantees about the code, but it should point out what kind of changes would need to happen to make it work.

Around line 140 in ui.resizable.js I changed:

this._handles = $('.ui-resizable-handle', this.element)
    .disableSelection();

this._handles = $('.ui-resizable-handle')
    .disableSelection();

Then I added the following code (part of mouseInit from ui.core.js, probably should use the whole function) in ui.resizable.js (around line 180) after the mouseInit is called for the resizable element:

   ...
   //Initialize the mouse interaction
   this._mouseInit();

   // Add mouse events for the handles as well - ylebre
   for (i in this.handles) {
      $(this.handles[i]).bind('mousedown.resizable', function(event) {
        return self._mouseDown(event);
      });
   }

This allows me to make a resize handle that is not a child of the resizable element. My handle is a div with id 'south' and is attached to the resizable element. Here is the HTML snippit:

<textarea id="resizable" class="ui-widget-content">
    <h3 class="ui-widget-header">Resizable</h3>
</textarea>
<div id="south" class="ui-resizable-handle">south</div>

And the javascript code:

    $("#resizable").resizable(
        {handles: {s: document.getElementById("south")}}
    );

Hope this helps!

回答2:

Yeah, looks like a bug to me. Here's a complete sample, for those trying locally:

<!DOCTYPE html>
<html>
<head>
  <link rel="stylesheet" href="http://jqueryui.com/latest/themes/base/ui.all.css" type="text/css"/>
  <script src="http://jquery-ui.googlecode.com/svn/tags/latest/jquery-1.3.2.js" type="text/javascript"></script>
  <script src="http://jquery-ui.googlecode.com/svn/tags/latest/ui/ui.core.js" type="text/javascript"></script>
  <script src="http://jquery-ui.googlecode.com/svn/tags/latest/ui/ui.resizable.js" type="text/javascript"></script>
  <style type="text/css">
    #resizable { width: 100px; height: 100px; background: silver; }
    #southgrip { width: 100px; height: 10px; background-color: blue; }
  </style>
  <script type="text/javascript">
    $(function() {
      $('#resizable').resizable({
        handles: { 's': $('#southgrip') },
        minHeight: 80,
        maxHeight: 400
      });
    });
  </script>
</head>
<body>

<div id="resizable"></div>
<div id="southgrip"></div>

</body>
</html>

This jQuery UI bug may be related.

Other things I tried:

Replace 'latest' with '1.6' and 'jquery-1.3.2' with 'jquery-1.2.6' to try with an older version of jQuery UI to see if it's a regression. Doesn't look like it.
Add ui-resizable-s and/or ui-resizable-handle CSS classes to #southgrip. No dice. However, if #southgrip is inside #resizable, it works. But, this doesn't solve your problem.
Using { 's': $('#southgrip').get(0) } for the handles option. No dice.

回答3:

I had the same problem 4 years after. It sames they never fixed that. I though to use Interface but it did not have any updates since 2007. So I decided to fix the bug by myself and make a request pull in the jQuery UI project in Github. https://github.com/jquery/jquery-ui/pull/1134 I hope they accept it and merge it soon. I added a test so I'm sure it will work in any case because all the tests of resizable from Jquery UI works with this modification.

I started using ylebre code but it did not work. So I made some little changes.

回答4:

Finally found an extremely effective solution after hours of trying to get over this annoying bug. Simply, append your handle element in the ui class. The function below has been tested and works fine with South and West handles. Hope that helps!

function resizables(element, handle, type){

 var height = handle.height();
 var place = type =="s"? "bottom":"top";
 var css = {};
        css["height"] = height+"px";
        css[place] = -height+"px";


 element.resizable({handles: type});
 var jqclass = element.find(".ui-resizable-"+type);

        handle.css({"cursor": type+"-resize"});
        jqclass.append(handle); 
        jqclass.css(css);
}

When you call the function like below, your custom handle will be placed in the right location and will work probably. PS: the function works with 'n' and 's' handles.

resizables($("#draggable"), $("#handle"), 's');

回答5:

I had a similar issue but my need was to set the hadlers dynamically to multiple elements:

            $.each($(".imagecontainer"),function() {
                $(this).resizable({
                    handles: {se: $(this).closest(".spaciator").find(".ui-resizable-se")}
                });
            };

来源：https://stackoverflow.com/questions/958419/custom-resizable-handles-in-jquery-ui

标签

jquery

html

jquery-ui

user-interface

resizable