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script.js
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Created
Fri, Feb 7, 7:18 PM

script.js

// apply tagOpen/tagClose to selection in textarea,
// use sampleText instead of selection if there is none
function insertTags(tagOpen, tagClose, sampleText, textarea_id) {
var txtarea = document.getElementById(textarea_id);
var selText, isSample = false;
if (document.selection && document.selection.createRange) { // IE/Opera
//save window scroll position
if (document.documentElement && document.documentElement.scrollTop) {
var winScroll = document.documentElement.scrollTop;
}
else if (document.body) {
var winScroll = document.body.scrollTop;
}
//get current selection
txtarea.focus();
var range = document.selection.createRange();
selText = range.text;
//insert tags
checkSelectedText();
range.text = tagOpen + selText + tagClose;
//mark sample text as selected
if (isSample && range.moveStart) {
if (window.opera) {
tagClose = tagClose.replace(/\n/g,'');
}
range.moveStart('character', - tagClose.length - selText.length);
range.moveEnd('character', - tagClose.length);
}
range.select();
//restore window scroll position
if (document.documentElement && document.documentElement.scrollTop) {
document.documentElement.scrollTop = winScroll;
}
else if (document.body) {
document.body.scrollTop = winScroll;
}
} else if (txtarea.selectionStart || txtarea.selectionStart == '0') { // Mozilla
//save textarea scroll position
var textScroll = txtarea.scrollTop;
//get current selection
txtarea.focus();
var startPos = txtarea.selectionStart;
var endPos = txtarea.selectionEnd;
selText = txtarea.value.substring(startPos, endPos);
//insert tags
checkSelectedText();
txtarea.value = txtarea.value.substring(0, startPos)
+ tagOpen + selText + tagClose
+ txtarea.value.substring(endPos, txtarea.value.length);
//set new selection
if (isSample) {
txtarea.selectionStart = startPos + tagOpen.length;
txtarea.selectionEnd = startPos + tagOpen.length + selText.length;
} else {
txtarea.selectionStart = startPos + tagOpen.length + selText.length + tagClose.length;
txtarea.selectionEnd = txtarea.selectionStart;
}
//restore textarea scroll position
txtarea.scrollTop = textScroll;
}
function checkSelectedText(){
if (!selText) {
selText = sampleText;
isSample = true;
} else if (selText.charAt(selText.length - 1) == ' ') { //exclude ending space char
selText = selText.substring(0, selText.length - 1);
tagClose += ' '
}
}
}

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