jQuery ready function being called twice in a dialog_问答_开发者

I am building a jQuery dialog with tabs in a PHP script. The script uses the 'include' directive inside of a loop, iterating over the tabs and including the other scripts. Each of the included files has the data for the tab and a <script> tag with a jQuery document.ready() function in it. Without the loop, it essentially does this:

<div id="tabDialog">
  <div id="tabs">
    <ul>
      <li><a href="#tab1'>Tab1</a></li>
      <li><a href="#tab2'>Tab2</a></li>
    </ul>
    <div id="tabContainer">
      <div id="tab1">
        <?php include "tab1.php"; ?>
      </div>
      <div id="tab2">
        <?php include "tab2.php"; ?>
      开发者_开发知识库</div>
    </div>
  </div>
</div>

and, for example, tab1.php might have something like:

<script type="text/javascript">
   $(document).ready (function () {
       alert ('tab1 loaded');
   });
</script>

The problem is, upon creating and opening the dialog using the <div id="dialog"> as the dialog's DIV, the document's ready function is called a second time. Here is the dialog code:

 $("#tabDialog").dialog ({
   autoOpen: false,
   minWidth: 450,
   minHeight: 400,
   width: 600,
   height: 500
 }).dialog ('open');

What is the cause of this and what would be the best way to remedy the situation? I'm trying to keep each tab's functionality in separate files because they can be used in multiple situations and I don't have to replicate the code associated to them.

Thanks for any help or advice.

I believe I've found the reason and created a reasonably good fix. When jQuery creates the dialog, it moves the DIV that contains the contents of the dialog around in the DOM (to the very end of the document) and surrounds that div with the necessary scaffolding that a dialog requires (probably by using the .append() function or something similar). Because the DIV which was being dynamically had Javascript contained within it, jQuery was calling the document.ready() function after the DIV was relocated in the DOM (i.e. a second time). Therefore, prior to building the dialog, I .remove() every script tag within the dialog's DIV like this:

    $("#tabDialog").find ("script").remove ();
    $("#tabDialog").dialog ({
      autoOpen: true,
      minWidth: 450,
      minHeight: 400,
      width: 600,
      height: 500
    });

Doing this removes the SCRIPT tag from the DIV which it was originally loaded in, but the SCRIPT itself still exists. I'm still researching this because I don't completely understand where the Javascript code that was dynamically loaded actually "lives," but I suspect it's located somewhere outside of the DOM. I verified this in Chrome, Firefox, and Exploder 8.

I verified that any scripts that were originally contained within the loaded DIVs still function as expected by putting a button in the DIV and assigning a .click() function. Here is a small test that demonstrates this:

<html>
  <head>
    <link href="css/redmond/jquery-ui-1.8.1.custom.css" type="text/css" rel="stylesheet" media="screen" />
    <link href="css/style.css" type="text/css" rel="stylesheet" media="screen" />

    <script src="js/jquery-1.4.2.js" type="text/javascript"></script>
    <script src="js/jquery-ui-1.8.1.custom.min.js" type="text/javascript"></script>
  </head>

  <body>
    <div id="dialogContents" style="display: none;">
      <div  style="border: 1px solid black; height: 98%;">
        <form id="testForm">
          <input type="text">
        </form>
        <button id="testButton">Test</button>
        <script type="text/javascript">
          $(document).ready (function () {
            alert ("ready");

            $("#testButton").click (function () {
              alert ('click');
            });
          });
        </script>
      </div>
    </div>
  </body>

  <script type="text/javascript">
    $(document).ready (function () {
      //
      // Remove all the scripts from any place in the dialog contents.  If we
      // do not remove the SCRIPT tags, the .ready functions are called a
      // second time.  Removing this next line of Javascript demonstrates this.
      //
      $("#dialogContents").find ("script").remove ();
      $("#dialogContents").dialog ({
        width: 300,
        height: 300,
        title: 'Testing...'
      });
    });
  </script>

</html>

I appreciate the help people provided in this thread!

I haven't used .dialog() too much, but do you need to use jQuery's ready() method in your script?

Looks like .dialog() has callback options you could take advantage of.

Script in tab:

    <script type="text/javascript">
        function onOpen() { alert('tab1 loaded') };
    </script>

dialog:

$(this).dialog ({
    autoOpen: false,
    minWidth: 450,
    minHeight: 400,
    width: 600,
    height: 500,
    open: function(event, ui) { onOpen(); } // call function in script
}).dialog ('open');

So I have to say that I am not 100% sure why it is happening even though I understand that the dialog does maintin it's own state so this might be one of the reasons. But I could be way off. But the way to get around it is to use something like this instead:

$(document).one('ready', function () {
   alert ('tab1 loaded');
});

This will make sure that it only runs once when the page loads.

I also had this problem, but the cause in my case was something different. I had a self-closing div element inside of the div that was used as the dialog holder. When I replaced the self-closing element with a closing tag, the document ready function stopped firing twice and only fired once, as expected.

For example, this caused the document ready function to fire twice:

$("#foo").dialog({
  // ...
});

...

<div id="foo" title="My Dialog">
  <div id="bar" />
</div>

Whereas this only fired the document ready function once:

$("#foo").dialog({
  // ...
});

...

<div id="foo" title="My Dialog">
  <div id="bar"></div>
</div>

You probably don't need the .dialog('open') call; use the option autoOpen : true instead.

Here's the resulting text of the page. I did a view-source and then removed any extraneous stuff from the page to try and make it simpler.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html>
    <head>
        <link href="css/redmond/jquery-ui-1.8.1.custom.css" type="text/css" rel="stylesheet" media="screen" />
        <link href="css/style.css" type="text/css" rel="stylesheet" media="screen" />
        <script src="js/jquery-1.4.2.min.js" type="text/javascript"></script>
        <script src="js/jquery-ui-1.8.1.custom.min.js" type="text/javascript"></script>
    </head>

    <body>
        <div id="tabDialog" style="position: relative; display: none;" title="Test Dialog">
            <div id="tabs" style="position: absolute; top: 5px; bottom: 40px; left: 3px; right: 3px;">
                <ul>
                    <li><a href='#tab1'>Tab #1</a></li><li><a href='#tab2'>Tab #2</a></li>
                </ul>

                <div class="tab_container" style="position: absolute; top: 35px; bottom: 0px; left: 1px; right: 1px; overflow: auto;">
                    <div id='tab1' class='tabPage ui-dialog-content'>
                        <form id="tab1Form">
                            More testing... <input class="keypressMonitor" type="text">
                        </form>
                        Testing...<br/>
                        Testing...<br/>

                        <script type="text/javascript">
                            $(document).ready (function () {
                                alert ('tab1 loaded');
                                $("#tab1Form").bind ('save', function () {
                                    alert ("in tab1Form.save ()");
                                });
                            });
                        </script>
                    </div>

                    <div id='tab2' class='tabPage ui-dialog-content'>
                        <form id="tab2Form">
                            <div style="position: absolute; left: 1px; right: 1px; top: 1px; bottom: 1px;">
                                Testing: <input class="keypressMonitor" type="text">

                                <textarea id="testArea" class="keypressMonitor tinymce" style="position: absolute; top: 30px; bottom: 2px; left: 2px; right: 2px;"></textarea>
                            </div>
                        </form>

                        <script type="text/javascript">
                            $(document).ready (function () {
                                $("#tab2Form").bind ('save', function () {
                                    alert ("in tab2Form.save ()");
                                });
                            });
                        </script>
                    </div>
                </div>
            </div>

            <div id="dialogButtons" style="position: absolute; bottom: 3px; left: 3px; right: 15px; text-align: right; height: 32px;">
                <button class="applyButton" disabled>Apply</button>
                <button class="okButton" disabled>Ok</button>
                <button class="cancelButton">Cancel</button>
            </div>
        </div>

        <script type="text/javascript">
            $(document).ready (function () {
                $("#tabs").tabs ();
                $("button").button ();

                /**
                 * Pressing the cancel button simply closes the dialog.
                 */
                $(".cancelButton").click (function () {
                    $("#tabDialog").dialog ("close");
                });

                $("#tabDialog").dialog ({
                    open: function () {
                    },
                    autoOpen: true,
                    minWidth: 450,
                    minHeight: 400,
                    width: 600,
                    height: 500,
                    height: 'auto'
                });
            });
        </script>
    </body>
</html>

Puts your script into create method:

$.dialog({
    <your parameters>
    create: function() {
        <your script>
    }
}

With this method your script is called once only you create the dialog, not twice!

jQuery ready function being called twice in a dialog

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