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Return selectionStart for div?

I need to find a way to determine the character position of a users
selection in a div. I can do this with the following using an input
text box. Any way for a div or any text within the body tags?

<html>
<body>
<form>
<div onkeyup="s(this )" onclick="s(this )" id="myDiv">Thi s is some
text</div>
<input type="text" onkeyup="s(this )" onclick="s(this )" value="This is
some text">
</form>
<script type="text/javascript">
function s(el)
{
var sel, rng, r2, i=-1;

//firefox
if(typeof el.selectionSta rt=="number")
{
i=el.selectionS tart;
}
//ie
else if(document.sel ection && el.createTextRa nge)
{
sel=document.se lection;
if(sel)
{
r2=sel.createRa nge();
rng=el.createTe xtRange();
rng.setEndPoint ("EndToStart ", r2);
i=rng.text.leng th;
}
}
else
{
el.onkeyup=null ;
el.onclick=null ;
}
alert(i)
}
</script>
</body>
</html>

Jul 23 '05 #1
1 18986
je*********@hot mail.com wrote:
I need to find a way to determine the character position of a users
selection in a div.


The following should demonstrate some methods you can use with ranges;
tested IE6 and Mozilla 1.7.
---
<div
onmouseup="aler t(getCharPositi on(this));"
onmousedown="pr epare(this)">He llo, World</div>

<script type="text/javascript">
var getCharPosition =(function(){

function getSel(){
var sel=null;
if(
typeof document.select ion!="undefined " &&
document.select ion &&
document.select ion.type=="Text "
){
sel=document.se lection;
} else if(
window.getSelec tion &&
window.getSelec tion().rangeCou nt>0
){
sel=window.getS election();
}
return sel;
}

function createRangeFrom Sel(sel){
var rng=null;
if(sel.createRa nge) {
rng=sel.createR ange();
} else if(sel.getRange At) {
rng=sel.getRang eAt(0);
if(rng.toString ()=="") rng=null;
}
return rng;
}

return function(el){
var sel=getSel(), rng, r2, i=-1;
if(sel){
rng=createRange FromSel(sel);
if(rng){

if(rng.parentEl ement) {
if(rng.parentEl ement()==el){
r2=document.bod y.createTextRan ge();
r2.moveToElemen tText(el);
r2.collapse(tru e);
r2.setEndPoint( "EndToStart ", rng);
i=r2.text.lengt h;
}
} else {
if(
rng.startContai ner &&
rng.endContaine r &&
rng.startContai ner==rng.endCon tainer &&
rng.startContai ner==rng.common AncestorContain er &&
rng.commonAnces torContainer.pa rentNode==el
){

//make sure your DIV does not have any inner element,
//otherwise more code is required in order to filter
//text nodes and count chars

i=rng.startOffs et;
}
}
}
}
return i;
};

})();

function prepare(el){
if(el.normalize ) {
el.normalize();
}
}
</script>
---
HTH,
Yep.
Jul 23 '05 #2

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