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+// Cross-broswer implementation of text ranges and selections
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+// documentation: http://bililite.com/blog/2011/01/17/cross-browser-text-ranges-and-selections/
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+// Version: 1.5
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+// Copyright (c) 2010 Daniel Wachsstock
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+// MIT license:
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+// Permission is hereby granted, free of charge, to any person
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+// obtaining a copy of this software and associated documentation
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+// files (the "Software"), to deal in the Software without
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+// restriction, including without limitation the rights to use,
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+// copy, modify, merge, publish, distribute, sublicense, and/or sell
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+// copies of the Software, and to permit persons to whom the
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+// Software is furnished to do so, subject to the following
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+// conditions:
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+
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+// The above copyright notice and this permission notice shall be
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+// included in all copies or substantial portions of the Software.
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+
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+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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+// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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+// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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+// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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+// OTHER DEALINGS IN THE SOFTWARE.
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+
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+(function(){
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+
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+bililiteRange = function(el, debug){
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+ var ret;
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+ if (debug){
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+ ret = new NothingRange(); // Easier to force it to use the no-selection type than to try to find an old browser
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+ }else if (document.selection){
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+ // Internet Explorer
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+ ret = new IERange();
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+ }else if (window.getSelection && el.setSelectionRange){
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+ // Standards. Element is an input or textarea
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+ ret = new InputRange();
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+ }else if (window.getSelection){
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+ // Standards, with any other kind of element
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+ ret = new W3CRange()
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+ }else{
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+ // doesn't support selection
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+ ret = new NothingRange();
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+ }
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+ ret._el = el;
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+ // determine parent document, as implemented by John McLear <john@mclear.co.uk>
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+ ret._doc = el.ownerDocument;
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+ ret._win = 'defaultView' in ret._doc ? ret._doc.defaultView : ret._doc.parentWindow;
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+ ret._textProp = textProp(el);
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+ ret._bounds = [0, ret.length()];
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+ return ret;
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+}
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+
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+function textProp(el){
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+ // returns the property that contains the text of the element
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+ if (typeof el.value != 'undefined') return 'value';
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+ if (typeof el.text != 'undefined') return 'text';
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+ if (typeof el.textContent != 'undefined') return 'textContent';
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+ return 'innerText';
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+}
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+
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+// base class
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+function Range(){}
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+Range.prototype = {
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+ length: function() {
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+ return this._el[this._textProp].replace(/\r/g, '').length; // need to correct for IE's CrLf weirdness
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+ },
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+ bounds: function(s){
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+ if (s === 'all'){
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+ this._bounds = [0, this.length()];
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+ }else if (s === 'start'){
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+ this._bounds = [0, 0];
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+ }else if (s === 'end'){
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+ this._bounds = [this.length(), this.length()];
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+ }else if (s === 'selection'){
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+ this.bounds ('all'); // first select the whole thing for constraining
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+ this._bounds = this._nativeSelection();
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+ }else if (s){
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+ this._bounds = s; // don't do error checking now; things may change at a moment's notice
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+ }else{
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+ var b = [
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+ Math.max(0, Math.min (this.length(), this._bounds[0])),
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+ Math.max(0, Math.min (this.length(), this._bounds[1]))
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+ ];
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+ b[1] = Math.max(b[0], b[1]);
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+ return b; // need to constrain it to fit
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+ }
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+ return this; // allow for chaining
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+ },
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+ select: function(){
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+ this._nativeSelect(this._nativeRange(this.bounds()));
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+ return this; // allow for chaining
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+ },
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+ text: function(text, select){
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+ if (arguments.length){
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+ this._nativeSetText(text, this._nativeRange(this.bounds()));
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+ try { // signal the text change (IE < 9 doesn't support this, so we live with it)
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+ this._el.dispatchEvent(new CustomEvent('input', {detail: {text: text, bounds: this.bounds()}}));
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+ }catch(e){ /* ignore */ }
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+ if (select == 'start'){
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+ this.bounds ([this._bounds[0], this._bounds[0]]);
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+ }else if (select == 'end'){
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+ this.bounds ([this._bounds[0]+text.length, this._bounds[0]+text.length]);
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+ }else if (select == 'all'){
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+ this.bounds ([this._bounds[0], this._bounds[0]+text.length]);
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+ }
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+ return this; // allow for chaining
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+ }else{
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+ return this._nativeGetText(this._nativeRange(this.bounds()));
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+ }
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+ },
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+ insertEOL: function (){
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+ this._nativeEOL();
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+ this._bounds = [this._bounds[0]+1, this._bounds[0]+1]; // move past the EOL marker
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+ return this;
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+ },
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+ scrollIntoView: function(){
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+ this._nativeScrollIntoView(this._nativeRange(this.bounds()));
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+ return this;
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+ }
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+};
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+
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+// allow extensions ala jQuery
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+bililiteRange.fn = Range.prototype; // to allow monkey patching
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+bililiteRange.extend = function(fns){
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+ for (fn in fns) Range.prototype[fn] = fns[fn];
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+};
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+
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+function IERange(){}
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+IERange.prototype = new Range();
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+IERange.prototype._nativeRange = function (bounds){
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+ var rng;
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+ if (this._el.tagName == 'INPUT'){
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+ // IE 8 is very inconsistent; textareas have createTextRange but it doesn't work
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+ rng = this._el.createTextRange();
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+ }else{
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+ rng = this._doc.body.createTextRange ();
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+ rng.moveToElementText(this._el);
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+ }
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+ if (bounds){
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+ if (bounds[1] < 0) bounds[1] = 0; // IE tends to run elements out of bounds
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+ if (bounds[0] > this.length()) bounds[0] = this.length();
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+ if (bounds[1] < rng.text.replace(/\r/g, '').length){ // correct for IE's CrLf wierdness
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+ // block-display elements have an invisible, uncounted end of element marker, so we move an extra one and use the current length of the range
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+ rng.moveEnd ('character', -1);
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+ rng.moveEnd ('character', bounds[1]-rng.text.replace(/\r/g, '').length);
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+ }
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+ if (bounds[0] > 0) rng.moveStart('character', bounds[0]);
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+ }
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+ return rng;
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+};
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+IERange.prototype._nativeSelect = function (rng){
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+ rng.select();
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+};
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+IERange.prototype._nativeSelection = function (){
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+ // returns [start, end] for the selection constrained to be in element
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+ var rng = this._nativeRange(); // range of the element to constrain to
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+ var len = this.length();
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+ if (this._doc.selection.type != 'Text') return [len, len]; // append to the end
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+ var sel = this._doc.selection.createRange();
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+ try{
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+ return [
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+ iestart(sel, rng),
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+ ieend (sel, rng)
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+ ];
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+ }catch (e){
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+ // IE gets upset sometimes about comparing text to input elements, but the selections cannot overlap, so make a best guess
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+ return (sel.parentElement().sourceIndex < this._el.sourceIndex) ? [0,0] : [len, len];
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+ }
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+};
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+IERange.prototype._nativeGetText = function (rng){
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+ return rng.text.replace(/\r/g, ''); // correct for IE's CrLf weirdness
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+};
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+IERange.prototype._nativeSetText = function (text, rng){
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+ rng.text = text;
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+};
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+IERange.prototype._nativeEOL = function(){
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+ if (typeof this._el.value != 'undefined'){
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+ this.text('\n'); // for input and textarea, insert it straight
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+ }else{
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+ this._nativeRange(this.bounds()).pasteHTML('<br/>');
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+ }
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+};
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+IERange.prototype._nativeScrollIntoView = function(rng){
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+ rng.scrollIntoView();
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+}
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+// IE internals
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+function iestart(rng, constraint){
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+ // returns the position (in character) of the start of rng within constraint. If it's not in constraint, returns 0 if it's before, length if it's after
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+ var len = constraint.text.replace(/\r/g, '').length; // correct for IE's CrLf wierdness
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+ if (rng.compareEndPoints ('StartToStart', constraint) <= 0) return 0; // at or before the beginning
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+ if (rng.compareEndPoints ('StartToEnd', constraint) >= 0) return len;
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+ for (var i = 0; rng.compareEndPoints ('StartToStart', constraint) > 0; ++i, rng.moveStart('character', -1));
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+ return i;
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+}
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+function ieend (rng, constraint){
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+ // returns the position (in character) of the end of rng within constraint. If it's not in constraint, returns 0 if it's before, length if it's after
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+ var len = constraint.text.replace(/\r/g, '').length; // correct for IE's CrLf wierdness
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+ if (rng.compareEndPoints ('EndToEnd', constraint) >= 0) return len; // at or after the end
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+ if (rng.compareEndPoints ('EndToStart', constraint) <= 0) return 0;
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+ for (var i = 0; rng.compareEndPoints ('EndToStart', constraint) > 0; ++i, rng.moveEnd('character', -1));
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+ return i;
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+}
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+
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+// an input element in a standards document. "Native Range" is just the bounds array
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+function InputRange(){}
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+InputRange.prototype = new Range();
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+InputRange.prototype._nativeRange = function(bounds) {
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+ return bounds || [0, this.length()];
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+};
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+InputRange.prototype._nativeSelect = function (rng){
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+ this._el.setSelectionRange(rng[0], rng[1]);
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+};
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+InputRange.prototype._nativeSelection = function(){
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+ return [this._el.selectionStart, this._el.selectionEnd];
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+};
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+InputRange.prototype._nativeGetText = function(rng){
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+ return this._el.value.substring(rng[0], rng[1]);
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+};
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+InputRange.prototype._nativeSetText = function(text, rng){
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+ var val = this._el.value;
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+ this._el.value = val.substring(0, rng[0]) + text + val.substring(rng[1]);
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+};
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+InputRange.prototype._nativeEOL = function(){
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+ this.text('\n');
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+};
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+InputRange.prototype._nativeScrollIntoView = function(rng){
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+ // I can't remember where I found this clever hack to find the location of text in a text area
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+ var style = getComputedStyle(this._el);
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+ var oldheight = style.height;
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+ var oldval = this._el.value;
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+ var oldselection = this._nativeSelection();
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+ this._el.style.height = '1px';
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+ this._el.value = oldval.slice(0, rng[0]);
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+ var top = this._el.scrollHeight;
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+ // this gives the bottom of the text, so we have to subtract the height of a single line
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+ this._el.value = 'X';
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+ top -= 2*this._el.scrollHeight; // show at least a line above
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+ this._el.style.height = oldheight;
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+ this._el.value = oldval;
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+ this._nativeSelect(oldselection);
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+ // scroll into position if necessary
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+ if (this._el.scrollTop > top || this._el.scrollTop+this._el.clientHeight < top){
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+ this._el.scrollTop = top;
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+ }
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+ // now scroll the element into view; get its position as in jQuery.offset
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+ var rect = this._el.getBoundingClientRect();
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+ rect.top += this._win.pageYOffset - this._doc.documentElement.clientTop;
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+ rect.left += this._win.pageXOffset - this._doc.documentElement.clientLeft;
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+ // create an element to scroll to
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+ var div = this._doc.createElement('div');
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+ div.style.position = 'absolute';
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+ div.style.top = (rect.top+top-this._el.scrollTop)+'px'; // adjust for how far in the range is; it may not have scrolled all the way to the top
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+ div.style.left = rect.left+'px';
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+ div.innerHTML = ' ';
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+ this._doc.body.appendChild(div);
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+ div.scrollIntoViewIfNeeded ? div.scrollIntoViewIfNeeded() : div.scrollIntoView();
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+ div.parentNode.removeChild(div);
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+}
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+
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+function W3CRange(){}
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+W3CRange.prototype = new Range();
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+W3CRange.prototype._nativeRange = function (bounds){
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+ var rng = this._doc.createRange();
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+ rng.selectNodeContents(this._el);
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+ if (bounds){
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+ w3cmoveBoundary (rng, bounds[0], true, this._el);
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+ rng.collapse (true);
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+ w3cmoveBoundary (rng, bounds[1]-bounds[0], false, this._el);
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+ }
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+ return rng;
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+};
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+W3CRange.prototype._nativeSelect = function (rng){
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+ this._win.getSelection().removeAllRanges();
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+ this._win.getSelection().addRange (rng);
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+};
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+W3CRange.prototype._nativeSelection = function (){
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+ // returns [start, end] for the selection constrained to be in element
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+ var rng = this._nativeRange(); // range of the element to constrain to
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+ if (this._win.getSelection().rangeCount == 0) return [this.length(), this.length()]; // append to the end
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+ var sel = this._win.getSelection().getRangeAt(0);
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+ return [
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|
|
+ w3cstart(sel, rng),
|
|
|
|
|
+ w3cend (sel, rng)
|
|
|
|
|
+ ];
|
|
|
|
|
+ }
|
|
|
|
|
+W3CRange.prototype._nativeGetText = function (rng){
|
|
|
|
|
+ return rng.toString();
|
|
|
|
|
+};
|
|
|
|
|
+W3CRange.prototype._nativeSetText = function (text, rng){
|
|
|
|
|
+ rng.deleteContents();
|
|
|
|
|
+ rng.insertNode (this._doc.createTextNode(text));
|
|
|
|
|
+ this._el.normalize(); // merge the text with the surrounding text
|
|
|
|
|
+};
|
|
|
|
|
+W3CRange.prototype._nativeEOL = function(){
|
|
|
|
|
+ var rng = this._nativeRange(this.bounds());
|
|
|
|
|
+ rng.deleteContents();
|
|
|
|
|
+ var br = this._doc.createElement('br');
|
|
|
|
|
+ br.setAttribute ('_moz_dirty', ''); // for Firefox
|
|
|
|
|
+ rng.insertNode (br);
|
|
|
|
|
+ rng.insertNode (this._doc.createTextNode('\n'));
|
|
|
|
|
+ rng.collapse (false);
|
|
|
|
|
+};
|
|
|
|
|
+W3CRange.prototype._nativeScrollIntoView = function(rng){
|
|
|
|
|
+ // can't scroll to a range; have to scroll to an element instead
|
|
|
|
|
+ var span = this._doc.createElement('span');
|
|
|
|
|
+ rng.insertNode(span);
|
|
|
|
|
+ span.scrollIntoViewIfNeeded ? span.scrollIntoViewIfNeeded() : span.scrollIntoView();
|
|
|
|
|
+ span.parentNode.removeChild(span);
|
|
|
|
|
+}
|
|
|
|
|
+// W3C internals
|
|
|
|
|
+function nextnode (node, root){
|
|
|
|
|
+ // in-order traversal
|
|
|
|
|
+ // we've already visited node, so get kids then siblings
|
|
|
|
|
+ if (node.firstChild) return node.firstChild;
|
|
|
|
|
+ if (node.nextSibling) return node.nextSibling;
|
|
|
|
|
+ if (node===root) return null;
|
|
|
|
|
+ while (node.parentNode){
|
|
|
|
|
+ // get uncles
|
|
|
|
|
+ node = node.parentNode;
|
|
|
|
|
+ if (node == root) return null;
|
|
|
|
|
+ if (node.nextSibling) return node.nextSibling;
|
|
|
|
|
+ }
|
|
|
|
|
+ return null;
|
|
|
|
|
+}
|
|
|
|
|
+function w3cmoveBoundary (rng, n, bStart, el){
|
|
|
|
|
+ // move the boundary (bStart == true ? start : end) n characters forward, up to the end of element el. Forward only!
|
|
|
|
|
+ // if the start is moved after the end, then an exception is raised
|
|
|
|
|
+ if (n <= 0) return;
|
|
|
|
|
+ var node = rng[bStart ? 'startContainer' : 'endContainer'];
|
|
|
|
|
+ if (node.nodeType == 3){
|
|
|
|
|
+ // we may be starting somewhere into the text
|
|
|
|
|
+ n += rng[bStart ? 'startOffset' : 'endOffset'];
|
|
|
|
|
+ }
|
|
|
|
|
+ while (node){
|
|
|
|
|
+ if (node.nodeType == 3){
|
|
|
|
|
+ if (n <= node.nodeValue.length){
|
|
|
|
|
+ rng[bStart ? 'setStart' : 'setEnd'](node, n);
|
|
|
|
|
+ // special case: if we end next to a <br>, include that node.
|
|
|
|
|
+ if (n == node.nodeValue.length){
|
|
|
|
|
+ // skip past zero-length text nodes
|
|
|
|
|
+ for (var next = nextnode (node, el); next && next.nodeType==3 && next.nodeValue.length == 0; next = nextnode(next, el)){
|
|
|
|
|
+ rng[bStart ? 'setStartAfter' : 'setEndAfter'](next);
|
|
|
|
|
+ }
|
|
|
|
|
+ if (next && next.nodeType == 1 && next.nodeName == "BR") rng[bStart ? 'setStartAfter' : 'setEndAfter'](next);
|
|
|
|
|
+ }
|
|
|
|
|
+ return;
|
|
|
|
|
+ }else{
|
|
|
|
|
+ rng[bStart ? 'setStartAfter' : 'setEndAfter'](node); // skip past this one
|
|
|
|
|
+ n -= node.nodeValue.length; // and eat these characters
|
|
|
|
|
+ }
|
|
|
|
|
+ }
|
|
|
|
|
+ node = nextnode (node, el);
|
|
|
|
|
+ }
|
|
|
|
|
+}
|
|
|
|
|
+var START_TO_START = 0; // from the w3c definitions
|
|
|
|
|
+var START_TO_END = 1;
|
|
|
|
|
+var END_TO_END = 2;
|
|
|
|
|
+var END_TO_START = 3;
|
|
|
|
|
+// from the Mozilla documentation, for range.compareBoundaryPoints(how, sourceRange)
|
|
|
|
|
+// -1, 0, or 1, indicating whether the corresponding boundary-point of range is respectively before, equal to, or after the corresponding boundary-point of sourceRange.
|
|
|
|
|
+ // * Range.END_TO_END compares the end boundary-point of sourceRange to the end boundary-point of range.
|
|
|
|
|
+ // * Range.END_TO_START compares the end boundary-point of sourceRange to the start boundary-point of range.
|
|
|
|
|
+ // * Range.START_TO_END compares the start boundary-point of sourceRange to the end boundary-point of range.
|
|
|
|
|
+ // * Range.START_TO_START compares the start boundary-point of sourceRange to the start boundary-point of range.
|
|
|
|
|
+function w3cstart(rng, constraint){
|
|
|
|
|
+ if (rng.compareBoundaryPoints (START_TO_START, constraint) <= 0) return 0; // at or before the beginning
|
|
|
|
|
+ if (rng.compareBoundaryPoints (END_TO_START, constraint) >= 0) return constraint.toString().length;
|
|
|
|
|
+ rng = rng.cloneRange(); // don't change the original
|
|
|
|
|
+ rng.setEnd (constraint.endContainer, constraint.endOffset); // they now end at the same place
|
|
|
|
|
+ return constraint.toString().length - rng.toString().length;
|
|
|
|
|
+}
|
|
|
|
|
+function w3cend (rng, constraint){
|
|
|
|
|
+ if (rng.compareBoundaryPoints (END_TO_END, constraint) >= 0) return constraint.toString().length; // at or after the end
|
|
|
|
|
+ if (rng.compareBoundaryPoints (START_TO_END, constraint) <= 0) return 0;
|
|
|
|
|
+ rng = rng.cloneRange(); // don't change the original
|
|
|
|
|
+ rng.setStart (constraint.startContainer, constraint.startOffset); // they now start at the same place
|
|
|
|
|
+ return rng.toString().length;
|
|
|
|
|
+}
|
|
|
|
|
+
|
|
|
|
|
+function NothingRange(){}
|
|
|
|
|
+NothingRange.prototype = new Range();
|
|
|
|
|
+NothingRange.prototype._nativeRange = function(bounds) {
|
|
|
|
|
+ return bounds || [0,this.length()];
|
|
|
|
|
+};
|
|
|
|
|
+NothingRange.prototype._nativeSelect = function (rng){ // do nothing
|
|
|
|
|
+};
|
|
|
|
|
+NothingRange.prototype._nativeSelection = function(){
|
|
|
|
|
+ return [0,0];
|
|
|
|
|
+};
|
|
|
|
|
+NothingRange.prototype._nativeGetText = function (rng){
|
|
|
|
|
+ return this._el[this._textProp].substring(rng[0], rng[1]);
|
|
|
|
|
+};
|
|
|
|
|
+NothingRange.prototype._nativeSetText = function (text, rng){
|
|
|
|
|
+ var val = this._el[this._textProp];
|
|
|
|
|
+ this._el[this._textProp] = val.substring(0, rng[0]) + text + val.substring(rng[1]);
|
|
|
|
|
+};
|
|
|
|
|
+NothingRange.prototype._nativeEOL = function(){
|
|
|
|
|
+ this.text('\n');
|
|
|
|
|
+};
|
|
|
|
|
+NothingRange.prototype._nativeScrollIntoView = function(){
|
|
|
|
|
+ this._el.scrollIntoView();
|
|
|
|
|
+};
|
|
|
|
|
+
|
|
|
|
|
+})();
|