Ho costruito questo oggi. È una combinazione della tua risposta alex e tutti gli altri risultati all'interno di google. L'ho testato all'interno dei browser IE9, Chrome, Opera, Safari e Firefox sul PC e anche su un HTC Sensation con Android con il browser predefinito, Firefox, Chrome e Opera.
Solo l'Opera sul dispositivo mobile ha avuto qualche problema.
La mia soluzione:
// Control
var BSControl = function(iControl)
{
// Variable
var tControl = (typeof iControl == 'string' ? document.getElementById(iControl) : iControl);
// Get Caret
this.mGetCaret = function()
{
// Resultaat aanmaken
var tResult = -1;
// SelectionStart
// *) Input & Textarea
if(tResult == -1 && (tControl.selectionStart || tControl.selectionStart == '0'))
{
tResult = tControl.selectionStart;
}
// ContentWindow.GetSelection
// *) IFrame
if(tResult == -1 && (tControl.contentWindow && tControl.contentWindow.getSelection))
{
var tRange= tControl.contentWindow.getSelection().getRangeAt(0);
tResult = tRange.startOffset;
}
// GetSelection
// *) Div
if(tResult == -1 && (window.getSelection))
{
var tRange= window.getSelection().getRangeAt(0);
tResult = tRange.startOffset;
}
// Resultaat teruggeven
return tResult;
}
// Set Caret
this.mSetCaret = function(iPosition)
{
// SelectionStart
// *) Input & Textarea
if(tControl.selectionStart || tControl.selectionStart == '0')
{
tControl.selectionStart = iPosition;
tControl.selectionEnd = iPosition;
return;
}
// ContentWindow.GetSelection
// *) IFrame
if(tControl.contentWindow && tControl.contentWindow.getSelection)
{
var tRange = tControl.contentDocument.createRange();
tRange.setStart(tControl.contentDocument.body.firstChild, iPosition);
tRange.setEnd(tControl.contentDocument.body.firstChild, iPosition);
var tSelection = tControl.contentWindow.getSelection();
tSelection.removeAllRanges();
tSelection.addRange(tRange);
return;
}
// GetSelection
// *) Div
if(window.getSelection)
{
var tSelection = window.getSelection();
var tRange= tSelection.getRangeAt(0);
tRange.setStart(tControl.firstChild, iPosition);
tRange.setEnd(tControl.firstChild, iPosition);
tSelection.removeAllRanges();
tSelection.addRange(tRange);
return;
}
}
// Get Selection
this.mGetSelection = function()
{
// Resultaat aanmaken
var tResult = null;
// SelectionStart
// *) Input & Textarea
if(tResult == null && (tControl.selectionStart || tControl.selectionStart == '0'))
{
tResult = this.mGet().substring(tControl.selectionStart, tControl.selectionEnd);
}
// ContentWindow.GetSelection
// *) IFrame
if(tResult == null && (tControl.contentWindow && tControl.contentWindow.getSelection))
{
var tSelection = tControl.contentWindow.getSelection()
tResult = tSelection.toString();
}
// GetSelection
// *) Div
if(tResult == null && (window.getSelection))
{
var tSelection = window.getSelection()
tResult = tSelection.toString();
}
// Resultaat teruggeven
return tResult;
}
// Set Selection
this.mSetSelection = function(iFrom, iUntil)
{
// SelectionStart
// *) Input & Textarea
if(tControl.selectionStart || tControl.selectionStart == '0')
{
tControl.selectionStart = iFrom;
tControl.selectionEnd = iUntil;
return;
}
// ContentWindow.GetSelection
// *) IFrame
if(tControl.contentWindow && tControl.contentWindow.getSelection)
{
var tRange = tControl.contentDocument.createRange();
tRange.setStart(tControl.contentDocument.body.firstChild, iFrom);
tRange.setEnd(tControl.contentDocument.body.firstChild, iUntil);
var tSelection = tControl.contentWindow.getSelection();
tSelection.removeAllRanges();
tSelection.addRange(tRange);
return;
}
// GetSelection
// *) Div
if(window.getSelection)
{
var tSelection = window.getSelection();
var tRange= tSelection.getRangeAt(0);
tRange.setStart(tControl.firstChild, iFrom);
tRange.setEnd(tControl.firstChild, iUntil);
tSelection.removeAllRanges();
tSelection.addRange(tRange);
return;
}
}
// Set
this.mSet = function(iValue)
{
// Afhankelijk van aanwezige property waarde instellen
if('value' in tControl)
{
tControl.value = iValue;
}else if('innerText' in tControl)
{
tControl.innerText = iValue;
}else if('textContent' in tControl)
{
tControl.textContent = iValue;
}else if('innerHTML' in tControl)
{
tControl.innerHTML = iValue;
}
}
// Get
this.mGet = function()
{
// Resultaat aanmaken
var tResult = null;
// Afhankelijk van aanwezige property waarde instellen
if('value' in tControl)
{
tResult = tControl.value;
}else if('innerText' in tControl)
{
tResult = tControl.innerText;
}else if('textContent' in tControl)
{
tResult = tControl.textContent;
}else if('innerHTML' in tControl)
{
tResult = tControl.innerHTML;
}
// Resultaat teruggeven
return tResult;
}
}
Partenza [Rangy] (http://code.google.com/p/rangy/) –
Che tipo di posizione del cursore sei dopo? Vuoi soluzioni per elementi 'contenteditable' e/o input textareas/text? Come dovrebbe essere rappresentata la posizione del caret? –