admin管理员组

文章数量:1410697

Correct me if I am wrong, but seems to me jQuery event handling is pletely separate from the javascript event handling. I know that the order of executing jQuery and javascript event handlers themselves is undefined, but can the assumption be made that all javascript handlers will execute before jQuery ones?

In the example given in an answer to this question that seems to be the case.

Also, is there any preference on executing inline javascript event handlers in respect to bound ones?

For clarification, I am asking all of this because I encountered a problem where I have an inline event handler on onClick event of an <a> element that calls the submit() method of an enclosing form. Just before submitting the form, I want to dynamically add some hidden inputs to the form. Right now I am doing this:

        var preSubmit = function preSubmit()
        {
            // add inputs
        }

        var oldSubmit = form.submit;
        form.submit = function newSubmit()
        {
            preSubmit();
            oldSubmit.call(form, arguments);
        }


But I'm really wondering if there is a more elegant way and I really need some clarification on this.

Correct me if I am wrong, but seems to me jQuery event handling is pletely separate from the javascript event handling. I know that the order of executing jQuery and javascript event handlers themselves is undefined, but can the assumption be made that all javascript handlers will execute before jQuery ones?

In the example given in an answer to this question that seems to be the case.

Also, is there any preference on executing inline javascript event handlers in respect to bound ones?

For clarification, I am asking all of this because I encountered a problem where I have an inline event handler on onClick event of an <a> element that calls the submit() method of an enclosing form. Just before submitting the form, I want to dynamically add some hidden inputs to the form. Right now I am doing this:

        var preSubmit = function preSubmit()
        {
            // add inputs
        }

        var oldSubmit = form.submit;
        form.submit = function newSubmit()
        {
            preSubmit();
            oldSubmit.call(form, arguments);
        }


But I'm really wondering if there is a more elegant way and I really need some clarification on this.

  • javascript
  • jquery
  • events
Share Improve this question edited May 23, 2017 at 12:01 CommunityBot 11 silver badge asked Aug 11, 2010 at 7:44 alh84001alh84001 1,2933 gold badges15 silver badges25 bronze badges 1
  • " I know that the order of executing jQuery and javascript event handlers themselves is undefined" - No, all event handlers bound with jQuery will be executed in the order they are bound (when bound to a particular element - with delegated handlers you have to allow for bubbling) because jQuery manages this for you. But jQuery is still JavaScript, it still uses addEventListener() (when the browser has it), so the order of non-jQuery versus jQuery handlers will be undefined. – nnnnnn Commented Jun 18, 2013 at 12:39
Add a ment  | 

3 Answers 3

Reset to default 4

I'm not sure about the specs but I presume that event handlers are just queued in the same order as you define them. Inline handlers are defined right in the DOM node so nothing else can go earlier.

The most elegant way is to write all your JavaScript in an unobtrusive way, i.e., keep it separated from HTML (you appear to be mixing programming styles). Whatever, you can intercept form submission by attaching an onsubmit handler to the form:

$("form").submit(function(){
    // Do stuff
    return true;
});

Update

I've done some testing and it appears that an onsubmit handler attached to a form via jQuery does not get triggered when you call the DOM's submit() method somewhere else. Here's a workaround:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3/TR/html4/loose.dtd">
<html>
<head><title></title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<script type="text/javascript" src="http://ajax.googleapis./ajax/libs/jquery/1.4.2/jquery.min.js"></script>
<script type="text/javascript"><!--
jQuery(function($){
    $("a").each(function(i, a){
        a.onclick = function(){ // Remove previous handlers
            alert("I will no longer submit the form");
            $(this).closest("form").submit();
        };
    });
    $("form").submit(function(){
        alert("I'll take care myself, thank you");
        $("input[name=foo]").val("Another value");
        return true;
    });
});
//--></script>
</head>
<body>


<form action="" method="get">
    <input type="text" name="foo" value="Default value">
    <a href="javascript:;" onclick="document.forms[0].submit()">Submit form</a>
</form>

</body>
</html>

There are two solutions: Wrap the submit function of the form or the onClick handler of the link. I'm not aware that jQuery offers a "wrap existing function" API.

As for the run order, jQuery is JavaScript, so the handlers run when the browser runs them. That's not something specific to jQuery, except when the API states that something is run asynchronously.

Asides from the detail of your question, you could just add an onsubmit event, which will be called before the form submits anyway...

本文标签： Order of execution of jquery event handlers in respect to (inline) javascript event handlersStack Overflow

版权声明：本文标题：Order of execution of jquery event handlers in respect to (inline) javascript event handlers - Stack Overflow 内容由网友自发贡献，该文观点仅代表作者本人， 转载请联系作者并注明出处：http://www.betaflare.com/web/1744928835a2632770.html， 本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如发现本站有涉嫌抄袭侵权/违法违规的内容，一经查实，本站将立刻删除。