Extends the Element native object to include methods useful in managing inputs.
Element.implement({
tidy: function(){
this.set('value', this.get('value').tidy());
},
getTextInRange: function(start, end){
return this.get('value').substring(start, end);
},
getSelectedText: function(){
if (this.setSelectionRange) return this.getTextInRange(this.getSelectionStart(), this.getSelectionEnd());
return document.selection.createRange().text;
},
getSelectedRange: function(){
if (this.selectionStart != null){
return {
start: this.selectionStart,
end: this.selectionEnd
};
}
var pos = {
start: 0,
end: 0
};
var range = this.getDocument().selection.createRange();
if (!range || range.parentElement() != this) return pos;
var duplicate = range.duplicate();
if (this.type == 'text'){
pos.start = 0 - duplicate.moveStart('character', -100000);
pos.end = pos.start + range.text.length;
} else {
var value = this.get('value');
var offset = value.length;
duplicate.moveToElementText(this);
duplicate.setEndPoint('StartToEnd', range);
if (duplicate.text.length) offset -= value.match(/[\n\r]*$/)[0].length;
pos.end = offset - duplicate.text.length;
duplicate.setEndPoint('StartToStart', range);
pos.start = offset - duplicate.text.length;
}
return pos;
},
getSelectionStart: function(){
return this.getSelectedRange().start;
},
getSelectionEnd: function(){
return this.getSelectedRange().end;
},
setCaretPosition: function(pos){
if (pos == 'end') pos = this.get('value').length;
this.selectRange(pos, pos);
return this;
},
getCaretPosition: function(){
return this.getSelectedRange().start;
},
selectRange: function(start, end){
if (this.setSelectionRange){
this.focus();
this.setSelectionRange(start, end);
} else {
var value = this.get('value');
var diff = value.substr(start, end - start).replace(/\r/g, '').length;
start = value.substr(0, start).replace(/\r/g, '').length;
var range = this.createTextRange();
range.collapse(true);
range.moveEnd('character', start + diff);
range.moveStart('character', start);
range.select();
}
return this;
},
insertAtCursor: function(value, select){
var pos = this.getSelectedRange();
var text = this.get('value');
this.set('value', text.substring(0, pos.start) + value + text.substring(pos.end, text.length));
if (select !== false) this.selectRange(pos.start, pos.start + value.length);
else this.setCaretPosition(pos.start + value.length);
return this;
},
insertAroundCursor: function(options, select){
options = Object.append({
before: '',
defaultMiddle: '',
after: ''
}, options);
var value = this.getSelectedText() || options.defaultMiddle;
var pos = this.getSelectedRange();
var text = this.get('value');
if (pos.start == pos.end){
this.set('value', text.substring(0, pos.start) + options.before + value + options.after + text.substring(pos.end, text.length));
this.selectRange(pos.start + options.before.length, pos.end + options.before.length + value.length);
} else {
var current = text.substring(pos.start, pos.end);
this.set('value', text.substring(0, pos.start) + options.before + current + options.after + text.substring(pos.end, text.length));
var selStart = pos.start + options.before.length;
if (select !== false) this.selectRange(selStart, selStart + current.length);
else this.setCaretPosition(selStart + text.length);
}
return this;
}
});