Develop Reference

Split div content at cursor position

I need to split an element after user clicks on it and the attr 'contenteditable' becomes 'true'. This fiddle works for the first paragraph but not second because the latter is in a p tag. Similary in this fiddle you will see that when the element has html tags in it, the counter loses accuracy and hence the text before and after the cursor is not what you'd expect.
The assumption here is that the users will split the data in a way that the help tags will stay intact. As pointed out by dandavis here, e.g. the div has <i>Hello</i> <b>Wo*rld</b>, the user will only need to split the div into two divs, first will have <i>Hello</i> and the second div will have <b>Wo*rld</b> in it.
Html:
<div><mark>{DATE}</mark><i>via email: </i><mark><i>{EMAIL- BROKER OR TENANT}</i></mark></div>
JS:
var $splitbut = $('<p class="split-but">Split</p>');
$(this).attr('contenteditable', 'true').addClass('editing').append($splitbut);
var userSelection;
if (window.getSelection) {
userSelection = window.getSelection();
}
var start = userSelection.anchorOffset;
var end = userSelection.focusOffset;
var before = $(this).html().substr(0, start);
var after = $(this).html().substr(start, $(this).html().length);
The "Split" button is not working as generating the html is not an issue once I get proper "after" and "before" text. Any ideas as to what I am doing wrong here?

Something like this could work for the specific case you describe
$('div, textarea').on('click', function(e) {
var userSelection;
if (window.getSelection) {
userSelection = window.getSelection();
}
var start = userSelection.anchorOffset,
end = userSelection.focusOffset,
node = userSelection.anchorNode,
allText = $(this).text(),
nodeText = $(node).text();
// before and after inside node
var nodeBefore = nodeText.substr(0, start);
var nodeAfter = nodeText.substr(start, nodeText.length);
// before and after for whole of text
var allExceptNode = allText.split(nodeText),
before = allExceptNode[0] + nodeBefore,
after = nodeAfter + allExceptNode[1];
console.log('Before: ', before);
console.log('------');
console.log('After: ', after);
});
Updated demo at https://jsfiddle.net/gaby/vaLz55fv/10/
It might exhibit issues if there are tags whose content is repeated in the whole text. (problem due to splitting)

Create multiple selection at the same time when using document.selection in Javascript

I've known how to use the document.selection to do the highlighting. For example
/* http://jsfiddle.net/4J2dy/ */
$("#content").on('mouseup', function() {
highlighting();
});
var highlighting = function () {
var seleted_str = (document.all) ? document.selection.createRange().text : document.getSelection();
if(seleted_str != "") {
var stringToBeHighlighted = seleted_str.getRangeAt(0);
var span = document.createElement("span");
span.style.cssText = "background-color: #80deea";
span.className = "MT";
stringToBeHighlighted.surroundContents(span);
}
};
But there is something I don't know how to achieve.
Let's say that I have four layers created with the same content at the same time.
And I would like to select a sentence on the controlling layer while all the same sentence in the other three layers will be selected too.(See image below)
After the selection, I would like to pop out a menu(which I can do), and get the DOM element based on which button is pressed.(See image below)
Could anyone tell me how to achieve this? Or it just can't be done? I would be grateful if someone could answer for me.

It's kind of possible, and I would appreciate the input of SO user Tim Down as he knows a lot about JS Range/Selections, but I'll present my partial solution already.
Instead of selecting the 4 layers, you could just store the startOffset & endOffset in an external object that is updated on mouseup. The only by-effect this has, is that the user's selection will only get the color of the span when they click a layer button.
The advantage is that you can now simply work with DOM Textnodes as opposed to ranges/ selection (more complex, to me anyway).
I've chosen to find the layers with a data-layer attribute on the buttons and a corresponding id on the layers themselves. I handled the 'appending' of the 'selected span' by slicing the text content of the text nodes in the layers, like so:
layer.innerHTML = txt.slice(0, selText.start)
+ '<span class="MT" style="background-color: #80deea">'
+ txt.slice(selText.start, selText.end) + '</span>'
+ txt.slice(selText.end, txt.length);
See it in action here. I've added a cleanSelection function so only one selection is possible at a time (the start & end counters fail because selection ranges don't take into account HTML tags, so you have to get rid of the spans).
Final notes:
The fiddle will not work in browsers not supporting getElementsByClassName
The fiddle only supports one selection at a time.
The fiddle does not extensively test all conditions (eg, whether the nodetype of the first child is truly a text node, etc. But it ain't hard to add that yourself)
Entire JS code as reference (also in fiddle):
// this object will hold the start & end offsets of selection value
var selText = false;
// selText will be updated on mouseup
document.body.onmouseup = getSelText;
// on button click, selText will be highlighted
document.body.onclick = function(e) {
var target = e.target || e.srcElement, range, layer, txt;
// only do if it's a layer button & the selection is non-empty
if (target.getAttribute('data-layer') && selText !== false) {
// first remove previous spans, they break the startOffset & endOffset of the selection range
cleanSelection();
// get the clicked layer
layer = document.getElementById(target.getAttribute('data-layer'));
// this assumes that the first node in the layer is a textNode
txt = layer.firstChild.nodeValue;
// let's append the selection container now
layer.innerHTML = txt.slice(0, selText.start)
+ '<span class="MT" style="background-color: #80deea">'
+ txt.slice(selText.start, selText.end) + '</span>'
+ txt.slice(selText.end, txt.length);
// ...and empty the 'real selection'
window.getSelection().collapse();
// log results to console
console.log('From char ' + selText.start + ' to char ' + selText.end + ', in ' + layer.id);
}
};
function getSelText () {
var seleted_str = (document.all) ? document.selection.createRange().text : document.getSelection(), stringToBeHighlighted;
if(seleted_str !== "") {
stringToBeHighlighted = seleted_str.getRangeAt(0);
selText = {
start: stringToBeHighlighted.startOffset,
end: stringToBeHighlighted.endOffset
};
} else {
selText = false;
}
}
function cleanSelection() {
var getText, mtSpan = document.getElementsByClassName('MT');
for ( var i = 0; i < mtSpan.length; i++) {
getText = mtSpan[i].innerHTML;
mtSpan[i].previousSibling.nodeValue = mtSpan[i].previousSibling.nodeValue + getText + mtSpan[i].nextSibling.nodeValue;
mtSpan[i].parentNode.removeChild(mtSpan[i].nextSibling);
mtSpan[i].parentNode.removeChild(mtSpan[i]);
}
}

Getting already selected text

By using following code I am getting the selected text's startindex and the selected text itself. I am storing them in a local database. I am changing the selected text background color to yellow.
var mainDiv = document.getElementsByTagName("body")[0];
var sel = getSelectionCharOffsetsWithin(mainDiv);
var selectedText = window.getSelection();
location.href = selectedText + '*' + sel.start; // this is to call iOS function.
var range = window.getSelection().getRangeAt(0);
var span = document.createElement("span");
span.style.backgroundColor = "yellow";
span.setAttribute("id", sel.start);
range.surroundContents(span);
Now, I am doing something else, and again I come back to same page. Here now I want to show previously selected text as highlighted.

Use Rangy , nothing beats it , does exactly what your trying
Rangy
Have a look at this demo

how to select a text range in CKEDITOR programatically?

Problem:
I have a CKEditor instance in my javascript:
var editor = CKEDITOR.instances["id_corpo"];
and I need to insert some text programatically, and select some text range afterwards.
I already did insert text through
editor.insertHtml('<h1 id="myheader">This is a foobar header</h1>');
But I need to select (highlight) the word "foobar", programatically through javascript, so that I can use selenium to work out some functional tests with my CKEditor plugins.
UPDATE 1:
I've also tried something like
var selection = editor.getSelection();
var childs = editor.document.getElementsByTag("p");
selection.selectElement(childs);
But doesn't work at all!
How can I do that?
I think that
selection.selectRange()
could do the job, but I'could not figure out how to use it.
There are no examples over there :(

Get current selection
var editor = CKEDITOR.instances["id_corpo"];
var sel = editor.getSelection();
Change the selection to the current element
var element = sel.getStartElement();
sel.selectElement(element);
Move the range to the text you would like to select
var findString = 'foobar';
var ranges = editor.getSelection().getRanges();
var startIndex = element.getHtml().indexOf(findString);
if (startIndex != -1) {
ranges[0].setStart(element.getFirst(), startIndex);
ranges[0].setEnd(element.getFirst(), startIndex + findString.length);
sel.selectRanges([ranges[0]]);
}

You can also do the following:
get the current selection
var selection = editor.getSelection();
var selectedElement = selection.getSelectedElement();
if nothing is selected then create a new paragraph element
if (!selectedElement)
selectedElement = new CKEDITOR.dom.element('p');
Insert your content into the element
selectedElement.setHtml(someHtml);
If needed, insert your element into the DOM (it will be inserted into the current position)
editor.insertElement(selectedElement);
and then just select it
selection.selectElement(selectedElement);

Check out the selectElement() method of CKEDITOR.dom.selection.
http://docs.cksource.com/ckeditor_api/symbols/CKEDITOR.dom.selection.html

insert text at cursor point in ck editor
function insertVar(myValue) {
CKEDITOR.instances['editor1'].fire( 'insertText',myValue);
}
this is working for me

How do I insert a character at the caret with javascript?

I want to insert some special characters at the caret inside textboxes using javascript on a button. How can this be done?
The script needs to find the active textbox and insert the character at the caret in that textbox. The script also needs to work in IE and Firefox.
EDIT: It is also ok to insert the character "last" in the previously active textbox.

I think Jason Cohen is incorrect. The caret position is preserved when focus is lost.
[Edit: Added code for FireFox that I didn't have originally.]
[Edit: Added code to determine the most recent active text box.]
First, you can use each text box's onBlur event to set a variable to "this" so you always know the most recent active text box.
Then, there's an IE way to get the cursor position that also works in Opera, and an easier way in Firefox.
In IE the basic concept is to use the document.selection object and put some text into the selection. Then, using indexOf, you can get the position of the text you added.
In FireFox, there's a method called selectionStart that will give you the cursor position.
Once you have the cursor position, you overwrite the whole text.value with
text before the cursor position + the text you want to insert + the text after the cursor position
Here is an example with separate links for IE and FireFox. You can use you favorite browser detection method to figure out which code to run.
<html><head></head><body>
<script language="JavaScript">
<!--
var lasttext;
function doinsert_ie() {
var oldtext = lasttext.value;
var marker = "##MARKER##";
lasttext.focus();
var sel = document.selection.createRange();
sel.text = marker;
var tmptext = lasttext.value;
var curpos = tmptext.indexOf(marker);
pretext = oldtext.substring(0,curpos);
posttest = oldtext.substring(curpos,oldtext.length);
lasttext.value = pretext + "|" + posttest;
}
function doinsert_ff() {
var oldtext = lasttext.value;
var curpos = lasttext.selectionStart;
pretext = oldtext.substring(0,curpos);
posttest = oldtext.substring(curpos,oldtext.length);
lasttext.value = pretext + "|" + posttest;
}
-->
</script>
<form name="testform">
<input type="text" name="testtext1" onBlur="lasttext=this;">
<input type="text" name="testtext2" onBlur="lasttext=this;">
<input type="text" name="testtext3" onBlur="lasttext=this;">
</form>
Insert IE
<br>
Insert FF
</body></html>
This will also work with textareas. I don't know how to reposition the cursor so it stays at the insertion point.

In light of your update:
var inputs = document.getElementsByTagName('input');
var lastTextBox = null;
for(var i = 0; i < inputs.length; i++)
{
if(inputs[i].getAttribute('type') == 'text')
{
inputs[i].onfocus = function() {
lastTextBox = this;
}
}
}
var button = document.getElementById("YOURBUTTONID");
button.onclick = function() {
lastTextBox.value += 'PUTYOURTEXTHERE';
}

Note that if the user pushes a button, focus on the textbox will be lost and there will be no caret position!

loop over all you input fields...
finding the one that has focus..
then once you have your text area...
you should be able to do something like...
myTextArea.value = 'text to insert in the text area goes here';

I'm not sure if you can capture the caret position, but if you can, you can avoid Jason Cohen's concern by capturing the location (in relation to the string) using the text box's onblur event.

A butchered version of #bmb code in previous answer works well to reposition the cursor at end of inserted characters too:
var lasttext;
function doinsert_ie() {
var ttInsert = "bla";
lasttext.focus();
var sel = document.selection.createRange();
sel.text = ttInsert;
sel.select();
}
function doinsert_ff() {
var oldtext = lasttext.value;
var curposS = lasttext.selectionStart;
var curposF = lasttext.selectionEnd;
pretext = oldtext.substring(0,curposS);
posttest = oldtext.substring(curposF,oldtext.length);
var ttInsert='bla';
lasttext.value = pretext + ttInsert + posttest;
lasttext.selectionStart=curposS+ttInsert.length;
lasttext.selectionEnd=curposS+ttInsert.length;
}