问题

I have an iframe that contains a textarea, like so:

<html>
<body>

<form id="form1">
<div>
    <textarea id="area1" rows="15"></textarea>
</div>
</form>

</body>
</html>

I want to get the textarea text in the parent page. I've tried this:

var text = $('#frame1').contents().find('#area1').val();

But an empty string is returned. However if I put a value within tags this value is returned successfully:

<textarea id="area1" rows="15">something</textarea>

How can I get the value of the textarea from the page which contains the iframe?

回答1:

READING the `<textarea>`'s content:

var text1 = document.getElementById('myTextArea').value;     // plain JavaScript
var text2 = $("#myTextArea").val();                          // jQuery

WRITING to the `<textarea>`':

document.getElementById('myTextArea').value = 'new value';   // plain JavaScript
$("#myTextArea").val('new value');                           // jQuery

See DEMO JSFiddle here.

Do not use `.html()` or `.innerHTML`!

jQuery's .html() and JavaScript's .innerHTML should not be used, as they do not pick up changes to the textarea's text.

When the user types on the textarea, the .html() won't return the typed value, but the original one -- check demo fiddle above for an example.

回答2:

To get the value from a textarea with an id you just have to do

Edited

$("#area1").val();

If you are having more than one element with the same id in the document then the HTML is invalid.

回答3:

You could use val().

var value = $('#area1').val();
$('#VAL_DISPLAY').html(value);

回答4:

Get textarea text with JavaScript:

<!DOCTYPE html>
<body>
<form id="form1">
    <div>
        <textarea id="area1" rows="5">Yes</textarea>
        <input type="button" value="get txt" onclick="go()" />
        <br />
        <p id="as">Now what</p>
    </div>
</form>
</body>

function go() {
    var c1 = document.getElementById('area1').value;
    var d1 = document.getElementById('as');
    d1.innerHTML = c1;
}

http://jsfiddle.net/PUpeJ/3/

回答5:

Try .html() instead of .val() :

var text = $('#frame1').contents().find('#area1').html();

回答6:

As @Darin Dimitrov said, if it is not an iframe on the same domain it is not posible, if it is, check that $("#frame1").contents() returns all it should, and then check if the textbox is found:

$("#frame1").contents().find("#area1").length should be 1.

Edit

If when your textarea is "empty" an empty string is returned and when it has some text entered that text is returned, then it is working perfect!! When the textarea is empty, an empty string is returned!

Edit 2 Ok. Here there is one way, it is not very pretty but it works:

Outside the iframe you will access the textarea like this:

window.textAreaInIframe

And inside the iframe (which I assume has jQuery) in the document ready put this code:

$("#area1").change(function() {
    window.parent.textAreaInIframe = $(this).val();
}).trigger("change");

回答7:

%100 Solution: $('textarea[name="areaname"]').val()

来源：https://stackoverflow.com/questions/5831413/get-textarea-text-with-javascript-or-jquery

标签

javascript

jquery

html

textarea

Get textarea text with javascript or Jquery

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