Solved

BR instead of P in contentEditable DIV - Selection Problem

Posted on 2008-10-24
3
3,839 Views
Last Modified: 2008-10-24
I have HTML file which contains a DIV element with contentEditable enabled. I don't want to introduce P elements into the DIV element, but unfortunately a couple of web browsers tend to do this under certain circumstances.

So I came up with a workaround which intercepts when the user hits the return key. When the return key is pressed, a BR element is inserted, and the event is cancelled so that the web browser doesn't do its default process.

This much I have working, and to my surprise it works exactly how I want it to in IE first time. My problem is in the Gecko based browsers like Chrome, Firefox, and Safari. When the return key is pressed in any one of those browsers, the user-input caret is not repositioned after the new BR element.

Firefox is slightly different from Chrome and Safari. The caret is not immediately positioned correctly, but pressing a key on the keyboard appears remedy the problem. Chrome and Safari continue typing before the BR element.

Does anybody know how I can resolve this issue?
<html>
<head>
            <!-- Prototype Framework for JavaScript: http://www.prototypejs.org -->
            <script type="text/javascript" src="prototype.js"></script>
            <script type="text/javascript">
            window.onload = function(event) {
                        document.observe('keydown', doc_keydown.bindAsEventListener(document));
            }
 
            function charCode(event) {
                  return typeof event.which !== 'undefined' ? event.which : event.keyCode;
            }
            function doc_keydown(event) {
                  var range;
                  var code = charCode(event);
                  switch (code) {
                        case 13:      // return
                              if (document.selection) {            // IE
                                    range = document.selection.createRange();
                                    range.pasteHTML("<br />");
                                    range.moveEnd("character", 1);
                                    range.moveStart("character", 1);
                                    range.collapse(false);
                              }
                              else { // FF, Google Chrome
                                    range = window.getSelection().getRangeAt(0);
                                    range.deleteContents();
                                    var newNode = new Element("br");
                                    range.insertNode(newNode);
                                    range.setStartAfter(newNode);            // Doesn't work from here down.
                                    range.setEndAfter(newNode);
                                    range.collapse(false);
                              }
                              break;
                        default:
                              return true;
                  }
                  event.stop();
                  return false;
            }</script>
</head>
<body>
            <div contentEditable="true" style="border: solid 2px black; padding: 6px">
                        Some initial text - Edit Me!
            </div>
</body>
</html>

Open in new window

0
Comment
Question by:numberkruncher
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
3 Comments
 
LVL 44

Accepted Solution

by:
scrathcyboy earned 500 total points
ID: 22799910
Don't you need to use the createRange function first before you use getRangeAt -- yes?  no?

https://developer.mozilla.org/En/DOM:range
https://developer.mozilla.org/es/DOM/range.setStartAfter

like this --

range = document.createRange();
referenceNode = document.getElementsByTagName("div").item(0);
range.setStartAfter(referenceNode);

Also check this -- http://search.cpan.org/dist/Mozilla-DOM/lib/Mozilla/DOM/Range.pod

Anyway, this is an extremely important piece of code you are developing.  P tags can be a real <P>ain in the <P>utt at times, and it would be great to have a way to convert them to <BR> as needed.  If you don't get a solution that works, click the red button right of your question, request attention, and ask a MOD to send this out to HTML experts for assistance.
0
 
LVL 13

Author Comment

by:numberkruncher
ID: 22800929
Thanks scrathcyboy!

The Mozilla links really helped me to find a solution to this problem.

> Don't you need to use the createRange function first before you use getRangeAt -- yes?  no?

According to the (as always) fantastic QuirksMode website, it is necessary to use createRange before getRangeAt for older versions of the Safari web browser.
(http://www.quirksmode.org/dom/range_intro.html)

I found that in the Gecko browsers, my requirement was actually two separate procedures:
   1) replace original selection with "" 
   2) compose a new selection from scratch, or adjust the previously acquired range, followed by rebuilding the selection and adding the new range to it.

I have attached the working version of my HTML for those who are interested.

Here are some other websites which I found particularly useful:

https://developer.mozilla.org/En/DOM/Selection
http://www.wrox.com/WileyCDA/Section/JavaScript-DOM-Ranges-Page-3.id-292303.html


Thanks again for your help!
<html>
<head>
	<script type="text/javascript" src="prototype.js"></script>
	<script type="text/javascript">
		window.onload = function(event) {
			document.observe('keydown', doc_keydown.bindAsEventListener(document));
		}
 
		function charCode(event) {
			return typeof event.which !== 'undefined' ? event.which : event.keyCode;
		}
		function doc_keydown(event) {
			var selection = document.selection, range;
			var code = charCode(event);
			switch (code) {
				case 13:    // return
					if (selection) {	// IE
						range = selection.createRange();
						range.pasteHTML("<br />");
						range.moveEnd("character", 1);
						range.moveStart("character", 1);
						range.collapse(false);
					}
					else { // FF, Google Chrome
						selection = window.getSelection();
						range = selection.getRangeAt(0);
						range.deleteContents();
						var newNode = new Element("br");
						range.insertNode(newNode);
 
						range = document.createRange();
						range.setStartAfter(newNode);
						range.setEndAfter(newNode);
						range.collapse(false);
 
						selection.removeAllRanges();	// The bit I was missing!
						selection.addRange(range);
					}
					break;
				default:
					return true;
			}
			event.stop();
			return false;
		}
	</script>
</head>
<body>
	<div>
		<div style="float: right; margin-top: -4px; margin-right: -4px; width: 16px; height: 16px; background: whitesmoke; border: solid 1px gray"></div>
		<div contentEditable="true" style="border: solid 2px black; padding: 6px">
			Some initial text - Edit Me!
		</div>
	</div>
</body>
</html>

Open in new window

0
 
LVL 44

Expert Comment

by:scrathcyboy
ID: 22801035
I have added this question and solution to the knowledgebase.  It is one of the more important ones to come in to EE in a LONG while.  Cheers !!
0

Featured Post

Online Training Solution

Drastically shorten your training time with WalkMe's advanced online training solution that Guides your trainees to action. Forget about retraining and skyrocket knowledge retention rates.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Anchor Bookmark 6 33
close window in firefox 3 37
SSL unsecure page mystery 17 45
Make qty change inside array as well 1 15
Building a website can seem like a daunting task to the uninitiated but it really only requires knowledge of two basic languages: HTML and CSS.
In threads here at EE, each comment has a unique Identifier (ID). It is easy to get the full path for an ID via the right-click context menu. However, we often want to post a short link within a thread rather than the full link. This article shows a…
The viewer will receive an overview of the basics of CSS showing inline styles. In the head tags set up your style tags: (CODE) Reference the nav tag and set your properties.: (CODE) Set the reference for the UL element and styles for it to ensu…
Video by: Mark
This lesson goes over how to construct ordered and unordered lists and how to create hyperlinks.

732 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question