相当于`return document.getElementById(theVar)'的jQuery [英] jQuery equivalent to `return document.getElementById(theVar)'

问题描述

我有一个javascript函数

I've a javascript function

function $m(theVar){
    return document.getElementById(theVar)
}

上述代码的问题是，我要传递的元素是由ajax生成的，因此我需要在jquery中使用.live()之类的东西，除非它抛出错误

The problem with the above code is, the element I want to pass is generated by ajax so I need something like the .live() in jquery, unless it throws an error

如何在jQuery中重写上述函数，以便以后也可以检测到任何DOM元素.

How do I rewrite the above function in jQuery so that any DOM element generated later can also be detected.

更新:

我的页面首次加载时，它会加载

When my page first load, it loads

1)带有代码的ajaxupload.js

1) ajaxupload.js with codes

function ajaxUpload(form,url_action,msg){
   var id_element= "pop-con";
   function $m(theVar){
        return document.getElementById(theVar)
    }
   if($m(id_element)==null){
        erro += "The element of 3rd parameter does not exists.\n";
    }
}

2)带有代码的index.php

2) index.php with codes

<div id="popupMargin">
    <div class="close">x</div>
    <div id="pop-con"></div>
</div>
<div id="ajaxGenerateMarkUp"></div>

3)现在，单击按钮，会将以下标记添加到#ajaxGeneratedmarkUp div(通过ajax生成的标记)

3) now on the click of a button, the following markUp is added to the #ajaxGeneratedmarkUp div (mark-up generated through ajax)

<form  onSubmit="return disableForm(this);" action="crop/wizecho_upload.php" method="post" name="f" id="wizecho" enctype="multipart/form-data">
      <input id="file" type="file" name="file"  onChange="return disableForm(this), ajaxUpload(this.form,'crop/wizecho_upload.php', '&lt;br&gt;Uploading image please wait.....&lt;br&gt;'); return false;"/>
</form>

现在，在更改此输入类型文件时，在javascript中进行了调用.现在它显示了错误.

Now on change of this input type file, made the call on in the javascript. Now it shows the error.

[注意:我只发布了我认为可能会影响我的问题的代码段]

[Note: I only posted sections of code I think might affect my question]

推荐答案

jQuery的选择器可以检测到新生成的项目:

jQuery's selector can detected newly generated items:

$('#id');

所以在您的情况下:

var theVar = 'something';
$('#' + theVar); //returns a jQuery object of the select item
$('#' + theVar)[0]; //returns the first DOM object that jQuery finds with that id

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