Develop Reference

Using one onchange javascript function for all div

I have multiple <textarea>, sometime they are blank and sometime they are filled with text.
I want to insert a simple text code such as "<check>" which will automatically change to a check (\u2713).
Presently, my code is like this:
<textarea name="1-S" onchange="check(this.value)">
<check> //an input written by a user
</textarea>
<textarea name="1-NI" onchange="check(this.value)">
<check> //an input written by a user
</textarea>
<textarea name="1-C" onchange="check(this.value)">
<check> //an input written by a user
</textarea>
(This block of <textarea> gets repeated, but of course, with different name in each one.)
<script type="text/javascript">
function check(str){
var res = str.replace("<check>", "\u2713");
????
}
</script>
The output will then replace <check> into actual check symbol (\u2713)
The challenge is, I don't want to have to add ID to every <textarea> and then write a script for each one. So is there a way for me to use this one script to apply to all <textarea>???
Many thanks in advance!

You could use the getElementsByTagName method to create an array of your text area tags.

Since you're using jQuery:
$("textarea").each(function(index, textarea) {
// do replacement here
});
Note that you need to use HTML entities to put <check> into a textarea: <check>
Also, you can put a checkmark in without any Javascript like this: ✓

Yes. You can bind an event handler to all elements of a type using jquery.
$('textarea').on('change', function() {
var text = $(this).val();
if (text.match(/\<check\>/)) {
$(this).val(text.replace(/\<check\>/, "\u2713"));
}
});
The benefit of doing it this way is that you can remove your inline 'onchange' handlers from the html and consolidate your validation logic strictly to JavaScript.
To replace the actual textarea content you need to update the value of the textarea with the result of your String-replace regexp. var text = $(this).val() is just assigning the content of the textarea to the variable text, it's not a reference to the innerHTML portion of your textarea.
On a sidenote if you'd like to allow users to use shortcodes in a form, prefer square bracket syntax, e.g., [check].

Input field with attached text to the right

I'm doing a fancy comment list on my project, structured like this:
As you see, there's a comments list and at his bottom there's an input field (textarea) to submit a comment. Note that there's the current username attached to the right (let's call it a simple static appended text).
I just found this little JS to make an input field resize automatically by adapting it to the content.
function resizeInput() {
$(this).attr('size', $(this).val().length);
}
$('input[type="text"]').keyup(resizeInput).each(resizeInput);
But it's not enough. I need it for a textarea and I want it to behave correctly when a comment is long enough to wrap on another line. By definition, the input field is a box, and it obviously acts badly compared to what I want:
Instead, this should be the right behavior:
I looked everywhere and I can't think any way to implement this. Can somebody help me?

Here is a good plugin for textarea. But it using jQuery.
usage simple as always.
$(document).ready(function(){
$('textarea').autosize();
});

You could use the contenteditable attribute:
<span contenteditable="true">comment</span> by <span class="userName">someone</span>
It is supported in practically all browsers. Using the right CSS, you can underline the content and also limit the width.

I think you mean this
NOTE: No check for selection and bound to document. Exercise for the reader to bind to a specific field and swap it for a span
FiDDLE
$(document).keypress(function(e) {
var char = String.fromCharCode(e.which);
if (e.which==13) char = '<br/>'; // needs to handle backspace etc.
$("#textfield").append(char);
$("#hiddenfield").val($("#textfield").text()); // or .html if you want the BRs
e.preventDefault();
});
using
<span id="textfield"></span> - by My Username
If you make the field contenteditable you will get this in Chrome so some additional CSS may be needed

Use a <span> with contenteditable (supported in IE too). Here is a fiddle: http://jsfiddle.net/goabqjLn/2/
<span contenteditable>Insert a comment...</span> by My Username
Then, using JavaScript, attach an event listener that mirrors the inner text of the span into a hidden input field, so it gets submitted with your <form>.
Edit: I have updated the fiddle to also include the JS code. Here is the updated code:
<span class="editor" id="editor" contenteditable data-placeholder="Insert a comment...">Insert a comment...</span> by My Username
<!-- Hide this textarea in production: -->
<textarea type="text" id="comment"></textarea>
And the JS:
function mirror() {
var text = $('#editor').html().trim()
.replace(' ', ' ')
.replace(/<br(\s*)\/*>/ig, '\n') // replace single line-breaks
.replace(/<[p|div]\s/ig, '\n$0') // add a line break before all div and p tags
.replace(/(<([^>]+)>)/ig, ""); // remove any remaining tags
$('#comment').val(text);
}
$('#editor').focus(function () {
var editor = $(this);
if (editor.text() == editor.attr('data-placeholder')) {
editor.text('');
}
}).blur(function () {
var editor = $(this);
if (editor.text() == editor.attr('data-placeholder')) {
editor.text(editor.attr('data-placeholder'));
}
}).blur(mirror).keyup(mirror);

Can jQuery or Javascript change elements within textareas?

My first SO question! Here's what I am trying to do:
I'm rewriting a tool that generates some code a user can paste directly into Craigslist and other classified ad posting websites. I have created a list of websites (they populate from a database with PHP) the user can choose from with a radio button, and I want their choice to populate as bare text (not a link) between some <p></p> elements in a textarea. I'm using jQuery for this.
Textarea before the user chooses:
<p id="thing"></p>
Textarea after the user chooses:
<p id="thing">www.somewebsite.com</p>
HTML
<input type="radio" name="sitechoice" value="www.websiteone.com">www.websiteone.com<br />
<input type="radio" name="sitechoice" value="www.secondwebs.com">www.secondwebs.com
<textarea>
Some stuff already in here
Here is the website you chose:
<p id="thing"></p>
More stuff already here.
</textarea>
JS
$(document).ready(function () {
$("input").change(function () {
var website = $(this).val();
alert(website);
$("#thing2").html(website);
});
});
JS Fiddle (With comments)
If you see the JS Fiddle, you can see that I put another p element on the page outside the textarea, and it updates just fine, but the one inside the textarea does not. I have read many other like questions on SO and I'm starting to think that I can't change an element that's between textarea tags, I can only change the entire textarea itself. Please, lead me to enlightenment!

You actually can fairly easily manipulate the text contents of the textarea like it is part of the DOM, by transforming its contents into a jQuery object.
Here is a jsFiddle demonstrating this solution: http://jsfiddle.net/YxtH4/2/
The relevant code, inside the input change event:
// Your normal code
var website = $(this).val();
$("#thing2").html(website);
// This turns the textarea's val into a jQuery object ...
// And inserts it into an empty div that is created
var textareaHtml = $('<div>' + $("#textarea").val() + '</div>');
// Here you can do your normal selectors
textareaHtml.find("#thing").html(website);
// And this sets the textarea's content to the empty div's content
$("#textarea").val(textareaHtml.html());
The empty div wrapping your HTML is so that you can easily retrieve it as a string later using jQuery's .html() method, and so the parse does not fail if additional text is entered around the p element inside the textarea.
The real magic is $($("#textarea").val()), which takes your textarea's text and parses it into an HTML node contained in a jQuery object.

It can't do it the way that you are thinking (i.e., manipulate it as if it were a DOM element), but it is still accessible as the value of the textarea, so you can retrieve it like that, use basic string manipulation to alter it, and then set the updated string as the new value of the textarea again.
Something like this . . . first give the <textarea> an id value:
<textarea id="taTarget">
Some stuff already in here
Here is the website you chose:
<p id="thing"></p>
More stuff already here.
</textarea>
Then alter your script like this:
$(document).ready(function () {
$("input").change(function () {
var website = $(this).val();
var currentTAVal = $("#taTarget").val();
$("#taTarget").val(currentTAVal.replace(/(<p id="thing">)([^<]*)(<\/p>)/, "$1" + website + "$3"));
});
});
Unless you need the <p> element in there, you might consider using a more simple placeholder, since it won't actually act as an HTML element within the textarea. :)
EDIT : Fixed a typo in the .replace() regex.

I know that this answer is a little bit late, but here it goes =)
You can do exactly the way you want to do. But for that, you need to implement a small trick.
by having this HTML
<input type="radio" name="sitechoice" value="www.websiteone.com">www.websiteone.com
<br />
<input type="radio" name="sitechoice" value="www.secondwebs.com">www.secondwebs.com
<p id="thing2"></p>
<textarea id="textarea">
<p id="thing"></p>
</textarea>
you can edit textarea content, as a DOM by implementing something like the function changeInnerText
$(document).ready(function () {
$("input").change(function () {
var website = $(this).val(); // Gets value of input
changeInnerText(website);
//$("#thing").html(website); // Changes
//$("#thing2").html(website); // Does not change
});
var changeInnerText = function(text) {
var v = $("#textarea").val();
var span = $("<span>");
span.html(v);
var obj = span.find("#thing")[0];
$(obj).html(text);
console.log(obj);
console.log(span.html());
$("#textarea").val(span.html());
}
});
As you can see, I just get the information from the textarea, I create a temporary variable span to place textarea's content. and then manipulate it as DOM.

Instead of attempting to insert the text into the <p> element, insert the text into <textarea> element and include the <p> tag. Something like this should do the trick:
Change:
$("#thing").html(website);
to:
$("textarea").html('<p id="thing">'+website+'</p>');
And here is a fiddle: http://jsfiddle.net/nR94s/

.getSelection()

HTML code--
<script language="javascript" type="text/javascript" src="js/jquery-1.4.2.min.js"></script>
<script language="javascript" type="text/javascript" src="js/jquery.field.selection.js"></script>
<div id="copy">Copy</div>
<textarea....id="t">
jquery---
$(docu.....
$('#copy').click(function(){
var range = $('#TextArea').getSelection();
alert(range.text);
});
});
When the #copy button is pressed the alert does not show the selected text in #t. It comes in blank.
I need the selected text from the textarea

Your code is not running because, this statement fails
var range = $('#TextArea').getSelection();
There is nothing as TextArea as ID in the markup you provided, so the script encounters an error and does not continue beyond it.
If you place the alert at the top part, I am sure the alert box will pop up.
i.e
$('#copy').click(function(){
alert(''); //this will work
var range = $('#TextArea').getSelection();
alert(range.text);
});

getSelection is a method of the document, so you should do:
var range = document.getSelection();
also note that you'll have to use document.selection.createRange() in IE so everything gets a bit complicated.
take a look at this example for more information. you'll end up needing a function like this:
function getSelectedText(){
if(document.all){
var selection = document.selection;
var newRng = selection.createRange();
newRng.select();
return newRng.htmlText;
}else{
return document.getSelection();
}
}
wich should return the selected text and work in all major browsers.
EDIT:
just saw you're using some kind of jquery-plugin that (maybe) should make your code work. the problem is:
in your html, the id of the textarea is "t":
<textarea....id="t">
but in your javascript, you're trying to get the selection of id "TextArea":
$('#TextArea').getSelection();
please change the id of your textarea to "TextArea" (or the other way around) and see what happens.

I'm not sure about the question, but if you need to get the textarea value, just use the val jQuery method:
http://api.jquery.com/val/
$('#copy').click(function(){
var range = $('#t').val();
alert(range);
});

Either you change your id="t" or you change #TextArea to #t to get the textarea you have in your html markup.
But I have no idea what plugin that you are using or what it want.

Write inside text area with Javascript

I am trying to write something in text area when I click on a link.
function writeText(txt){
document.getElementById("writeArea").innerHTML = txt;
}
I would like to pass html tag in place of txt as parameter to this function so that I can get image, link etc inside text area. Is it possible in Javascript? || JQuery will be good?
Pre-thanks.

Or if jquery tag was there for a reason:
$('#writeArea').val(txt);

You should use value:
document.getElementById("writeArea").value = txt;

If you want to render some images and anchor tags on the screen then don't use a textarea. Use any other container like <div>, <span>, <p> etc.
$("#yourelementid").html(yourtext);
will put the text (in your case HTML) inside the element with id yourelementid
HTML
<p id="para1"></p>
jQuery
var txt = "<a href='http://www.google.com'>Google</a>";
$("#para1").html(txt);
See a working sample

You can easily do it in jQuery if you just want to set the text of a textarea:
$("#yourid").val("hello");
See it working: http://jsfiddle.net/quQqH/
If you're looking to have HTML in it then it needs to be a container element (such as a div).
// Html
<div id="yourid"></div>
//JavaScript
$("#yourid").html('My link');
Otherwise, another option is to have a Rich Text Editor (like Yahoo Editor) so that it renders the HTML that's in the textarea input - this will make it user editable. This is slightly more complicated, as you'll need to include the correct files to make the editor work. Then just do something like the following:
var myEditor = new YAHOO.widget.SimpleEditor('yourid', {
height: '200px',
width: '350px',
toolbar: 0 // Hides the toolbar
});
myEditor.render();
$("#yourid").val("Click for <a href='http://yahoo.com'>Yahoo</a>");
You can see this working: http://jsfiddle.net/quQqH/1/. In this case, I've removed the toolbar by setting it to 0 but it is customisable to show different buttons, etc. Just remove that line to display the default toolbar.

just give like this
$("#ID").val("<img src='images/logo.png' />");

If you want to write long text in the textarea, you can use this way:
HTML
<textarea id="theId"></textarea>
jQuery
var a = 'Test textarea content. Google" ';
$("#theId").val(a);
JS FIDDLE