reading innerHTML of HTML form with VALUE attribute (& its value) of INPUT tags

问题

I have a html form with some input fields.

Instead of reading and sending the values of input fields by document.ipForm.userName.value , I need to send the whole html content to html parser and extract the <name ,value> pair of each input field by some other program( and other information too).

But when i did this in JavaScript(i want pure JavaScript- not other library)

var contents=document.getElementById("formArea").innerHTML;
alert(contents);

It doesnot shows the value="enteredValue" of <input/> fields even if i entered some values.

My HTML File:

<html>
<head>
    <script type="text/javascript">
    function showInnerHtml(){
        var contents=document.getElementById("formArea").innerHTML;
        alert(contents);
    }
    </script>
</head>
<body>
    <div id="formArea">
        <form name="ipForm" >
          UserName : <input type="text" name="userName"> 
        </form>
    </div>
    <div> other contents.....   </div>
    <div onclick="showInnerHtml()">Show InnerHTML</div>
</body>
</html>

Am i missing something here or this is not possible.

Don't call me MAD. but i am struggling with this strange condition.

回答1:

That's because value is a property when the textbox is filled in, not an attribute. This means that .value works fine, but it's not part of the actual DOM as an attribute (like <input value="...">).

You'd need to set it explicitly: http://jsfiddle.net/BkjhZ/.

var elems = document.getElementsByName("ipForm")[0].getElementsByTagName("input");

for(var i = 0; i < elems.length; i++) {
    // set attribute to property value
    elems[i].setAttribute("value", elems[i].value);
}

回答2:

You can also write an input which will change itself his attribute, like this :

(...)

UserName : <input type="text" name="userName" onChange="this.setAttribute('value', this.value);">

And for checkboxes :

onClick="if (this.checked) { this.setAttribute('checked', null); } else { this.removeAttribute('checked'); }"

Enjoy :)

来源：https://stackoverflow.com/questions/7601851/reading-innerhtml-of-html-form-with-value-attribute-its-value-of-input-tags

标签

javascript

html

innerhtml