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/*
caretposition.js
Copyright (c) 2012- Hiroki Akiyama http://akiroom.com/
caretposition.js is free software distributed under the terms of the MIT license.
*/
Measurement = new function() {
this.caretPos = function(textarea, mode) {
var targetElement = textarea;
if (typeof jQuery != 'undefined') {
if (textarea instanceof jQuery) {
targetElement = textarea.get(0);
}
}
// HTML Sanitizer
var escapeHTML = function (s) {
var obj = document.createElement('pre');
obj[typeof obj.textContent != 'undefined'?'textContent':'innerText'] = s;
return obj.innerHTML;
};
// Get caret character position.
var getCaretPosition = function (element) {
var CaretPos = 0;
var startpos = -1;
var endpos = -1;
if (document.selection) {
// IE Support(not yet)
var docRange = document.selection.createRange();
var textRange = document.body.createTextRange();
textRange.moveToElementText(element);
var range = textRange.duplicate();
range.setEndPoint('EndToStart', docRange);
startpos = range.text.length;
var range = textRange.duplicate();
range.setEndPoint('EndToEnd', docRange);
endpos = range.text.length;
} else if (element.selectionStart || element.selectionStart == '0') {
// Firefox support
startpos = element.selectionStart;
endpos = element.selectionEnd;
}
return {start: startpos, end: endpos};
};
// Get element css style.
var getStyle = function (element) {
var style = element.currentStyle || document.defaultView.getComputedStyle(element, '');
return style;
};
// Get element absolute position
var getElementPosition = function (element) {
// Get scroll amount.
var html = document.documentElement;
var body = document.body;
var scrollLeft = (body.scrollLeft || html.scrollLeft);
var scrollTop = (body.scrollTop || html.scrollTop);
// Adjust "IE 2px bugfix" and scroll amount.
var rect = element.getBoundingClientRect();
var left = rect.left - html.clientLeft + scrollLeft;
var top = rect.top - html.clientTop + scrollTop;
var right = rect.right - html.clientLeft + scrollLeft;
var bottom = rect.bottom - html.clientTop + scrollTop;
return {left: parseInt(left), top: parseInt(top),
right: parseInt(right), bottom:parseInt(bottom)};
};
/***************************\
* Main function start here! *
\***************************/
var undefined;
var salt = "salt.akiroom.com";
var textAreaPosition = getElementPosition(targetElement);
var dummyName = targetElement.id + "_dummy";
var dummyTextArea = document.getElementById(dummyName);
if (!dummyTextArea) {
// Generate dummy textarea.
dummyTextArea = document.createElement("div");
dummyTextArea.id = dummyName;
var textAreaStyle = getStyle(targetElement)
dummyTextArea.style.cssText = textAreaStyle.cssText;
// Fix for browser differece.
var isWordWrap = false;
if (targetElement.wrap == "off") {
// chrome, firefox wordwrap=off
dummyTextArea.style.overflow = "auto";
dummyTextArea.style.whiteSpace = "pre";
isWordWrap = false;
} else if (targetElement.wrap == undefined) {
if (textAreaStyle.wordWrap == "break-word")
// safari, wordwrap=on
isWordWrap = true;
else
// safari, wordwrap=off
isWordWrap = false;
} else {
// firefox wordwrap=on
dummyTextArea.style.overflowY = "auto";
isWordWrap = true;
}
dummyTextArea.style.visibility = 'hidden';
dummyTextArea.style.position = 'absolute';
dummyTextArea.style.top = '0px';
dummyTextArea.style.left = '0px';
// Firefox Support
dummyTextArea.style.width = textAreaStyle.width;
dummyTextArea.style.height = textAreaStyle.height;
dummyTextArea.style.fontSize = textAreaStyle.fontSize;
dummyTextArea.style.maxWidth = textAreaStyle.width;
dummyTextArea.style.backgroundColor = textAreaStyle.backgroundColor;
dummyTextArea.style.fontFamily = textAreaStyle.fontFamily;
targetElement.parentNode.appendChild(dummyTextArea);
}
// Set scroll amount to dummy textarea.
dummyTextArea.scrollLeft = targetElement.scrollLeft;
dummyTextArea.scrollTop = targetElement.scrollTop;
// Set code strings.
var codeStr = targetElement.value;
// Get caret character position.
var selPos = getCaretPosition(targetElement);
var leftText = codeStr.slice(0, selPos.start);
var selText = codeStr.slice(selPos.start, selPos.end);
var rightText = codeStr.slice(selPos.end, codeStr.length);
if (selText == '') selText = "a";
// Set keyed text.
var processText = function (text) {
// Get array of [Character reference] or [Character] or [NewLine].
var m = escapeHTML(text).match(/((&|<|>|"|')|.|\n)/g);
if (m)
return m.join('<wbr>').replace(/\n/g, '<br>');
else
return '';
};
// Set calculation text for in dummy text area.
dummyTextArea.innerHTML = (processText(leftText) +
'<wbr><span id="' + dummyName + '_i">' + processText(selText) + '</span><wbr>' +
processText(rightText));
// Get caret absolutely pixel position.
var dummyTextAreaPos = getElementPosition(dummyTextArea);
var caretPos = getElementPosition(document.getElementById(dummyName+"_i"));
switch (mode) {
case 'self':
// Return absolutely pixel position - (0,0) is most top-left of TEXTAREA.
return {left: caretPos.left-dummyTextAreaPos.left, top: caretPos.top-dummyTextAreaPos.top};
case 'body':
case 'screen':
case 'stage':
case 'page':
default:
// Return absolutely pixel position - (0,0) is most top-left of PAGE.
return {left: textAreaPosition.left+caretPos.left-dummyTextAreaPos.left, top: textAreaPosition.top+caretPos.top-dummyTextAreaPos.top};
}
};
};
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