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$.fn.extend({
// Returns the current position of the cursor
getCaretPosition: function() {
var that = this[0],
range,
position;
if (document.selection) {
that.focus();
range = document.selection.createRange();
range.moveStart('character', -that.value.length);
position = range.text.length;
} else {
position = that.selectionStart || 0;
}
return position;
},
// Sets the current position of the cursor
setCaretPosition: function(position) {
return $(this).setSelection(position, position);
},
// Returns the currently selected text
getSelection: function() {
var that = this[0];
if (document.selection) {
return document.selection.createRange().text;
}
if (this[0].setSelectionRange) {
return this[0].value.substring(this[0].selectionStart, this[0].selectionEnd);
}
return false;
},
// Sets the currently selected text
setSelection: function(start, end) {
return this.each(function() {
var range;
if (this.setSelectionRange) {
this.setSelectionRange(start, end);
} else if (this.createTextRange) {
this.focus();
range = this.createTextRange();
range.collapse(true);
range.moveStart('character', start);
range.moveEnd('character', end);
range.select();
}
});
},
// Stores the current selection
storeSelection: function() {
return $(this).each(function() {
var selection = false,
position;
if (document.selection) {
position = $(this).getCaretPosition();
selection = {
start: position,
end: position + $(this).getSelection().length
};
} else if (this.setSelectionRange) {
selection = {
start: this.selectionStart,
end: this.selectionEnd
};
}
$(this).data('stored-selection', selection);
});
},
// Restores a possibly stored selection
restoreSelection: function() {
return $(this).each(function() {
var selection = $(this).data('stored-selection');
if (selection !== false) {
$(this).setSelection(selection.start, selection.end);
}
$(this).removeData('stored-selection');
});
},
// Replaces the currently selected text of an element with the given
// replacement
replaceSelection: function(replacement, cursor_position) {
return this.each(function() {
var scroll_top = this.scrollTop,
range,
selection_start;
if (document.selection) {
this.focus();
range = document.selection.createRange();
range.text = replacement;
range.select();
} else if (this.setSelectionRange) {
selection_start = this.selectionStart;
this.value =
this.value.substring(0, selection_start) + replacement + this.value.substring(this.selectionEnd);
this.setSelectionRange(
selection_start + (cursor_position || replacement.length),
selection_start + (cursor_position || replacement.length)
);
}
this.focus();
this.scrollTop = scroll_top;
});
}
});
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