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232 lines
8.0 KiB
232 lines
8.0 KiB
![]()
11 years ago
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/*
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* jQuery textarea suggest plugin
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*
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* Copyright (c) 2009-2010 Roman Imankulov
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*
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* Dual licensed under the MIT and GPL licenses:
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* http://www.opensource.org/licenses/mit-license.php
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* http://www.gnu.org/licenses/gpl.html
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*
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* Requires:
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* - jQuery (tested with 1.3.x and 1.4.x)
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* - jquery.a-tools >= 1.4.1 (http://plugins.jquery.com/project/a-tools)
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*/
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/*globals jQuery,document */
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(function ($) {
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// workaround for Opera browser
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if (navigator.userAgent.match(/opera/i)) {
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$(document).keypress(function (e) {
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if ($.asuggestFocused) {
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$.asuggestFocused.focus();
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$.asuggestFocused = null;
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e.preventDefault();
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e.stopPropagation();
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}
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});
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}
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$.asuggestKeys = {
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UNKNOWN: 0,
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SHIFT: 16,
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CTRL: 17,
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ALT: 18,
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LEFT: 37,
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UP: 38,
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RIGHT: 39,
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DOWN: 40,
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DEL: 46,
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TAB: 9,
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RETURN: 13,
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ESC: 27,
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COMMA: 188,
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PAGEUP: 33,
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PAGEDOWN: 34,
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BACKSPACE: 8,
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SPACE: 32
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};
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$.asuggestFocused = null;
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$.fn.asuggest = function (suggests, options) {
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return this.each(function () {
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$.makeSuggest(this, suggests, options);
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});
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};
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$.fn.asuggest.defaults = {
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'delimiters': '\n ',
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'minChunkSize': 1,
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'cycleOnTab': true,
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'autoComplete': true,
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'endingSymbols': ' ',
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'stopSuggestionKeys': [$.asuggestKeys.RETURN, $.asuggestKeys.SPACE],
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'ignoreCase': false
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};
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/* Make suggest:
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*
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* create and return jQuery object on the top of DOM object
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* and store suggests as part of this object
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*
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* @param area: HTML DOM element to add suggests to
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* @param suggests: The array of suggest strings
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* @param options: The options object
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*/
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$.makeSuggest = function (area, suggests, options) {
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options = $.extend({}, $.fn.asuggest.defaults, options);
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var KEY = $.asuggestKeys,
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$area = $(area);
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$area.suggests = suggests;
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$area.options = options;
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/* Internal method: get the chunk of text before the cursor */
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$area.getChunk = function () {
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var delimiters = this.options.delimiters.split(''), // array of chars
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textBeforeCursor = this.val().substr(0, this.getSelection().start),
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indexOfDelimiter = -1,
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i,
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d,
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idx;
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for (i = 0; i < delimiters.length; i++) {
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d = delimiters[i];
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idx = textBeforeCursor.lastIndexOf(d);
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if (idx > indexOfDelimiter) {
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indexOfDelimiter = idx;
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}
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}
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if (indexOfDelimiter < 0) {
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return textBeforeCursor;
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} else {
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return textBeforeCursor.substr(indexOfDelimiter + 1);
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}
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};
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/* Internal method: get completion.
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* If performCycle is true then analyze getChunk() and and getSelection()
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*/
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$area.getCompletion = function (performCycle) {
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var text = this.getChunk(),
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selectionText = this.getSelection().text,
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suggests = this.suggests,
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foundAlreadySelectedValue = false,
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firstMatchedValue = null,
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i,
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suggest;
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// search the variant
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for (i = 0; i < suggests.length; i++) {
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suggest = suggests[i];
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if ($area.options.ignoreCase) {
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suggest = suggest.toLowerCase();
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text = text.toLowerCase();
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}
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// some variant is found
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if (suggest.indexOf(text) === 0) {
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if (performCycle) {
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if (text + selectionText === suggest) {
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foundAlreadySelectedValue = true;
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} else if (foundAlreadySelectedValue) {
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return suggest.substr(text.length);
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} else if (firstMatchedValue === null) {
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firstMatchedValue = suggest;
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}
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} else {
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return suggest.substr(text.length);
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}
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}
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}
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if (performCycle && firstMatchedValue) {
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return firstMatchedValue.substr(text.length);
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} else {
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return null;
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}
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};
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$area.updateSelection = function (completion) {
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if (completion) {
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var _selectionStart = $area.getSelection().start,
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_selectionEnd = _selectionStart + completion.length;
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if ($area.getSelection().text === "") {
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if ($area.val().length === _selectionStart) { // Weird IE workaround, I really have no idea why it works
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$area.setCaretPos(_selectionStart + 10000);
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}
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$area.insertAtCaretPos(completion);
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} else {
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$area.replaceSelection(completion);
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}
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$area.setSelection(_selectionStart, _selectionEnd);
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}
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};
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$area.unbind('keydown.asuggest').bind('keydown.asuggest', function (e) {
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if (e.keyCode === KEY.TAB) {
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if ($area.options.cycleOnTab) {
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var chunk = $area.getChunk();
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if (chunk.length >= $area.options.minChunkSize) {
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$area.updateSelection($area.getCompletion(true));
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}
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e.preventDefault();
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e.stopPropagation();
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$area.focus();
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$.asuggestFocused = this;
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return false;
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}
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}
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// Check for conditions to stop suggestion
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if ($area.getSelection().length &&
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$.inArray(e.keyCode, $area.options.stopSuggestionKeys) !== -1) {
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// apply suggestion. Clean up selection and insert a space
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var _selectionEnd = $area.getSelection().end +
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$area.options.endingSymbols.length;
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var _text = $area.getSelection().text +
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$area.options.endingSymbols;
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$area.replaceSelection(_text);
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$area.setSelection(_selectionEnd, _selectionEnd);
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e.preventDefault();
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e.stopPropagation();
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this.focus();
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$.asuggestFocused = this;
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return false;
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}
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});
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$area.unbind('keyup.asuggest').bind('keyup.asuggest', function (e) {
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var hasSpecialKeys = e.altKey || e.metaKey || e.ctrlKey,
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hasSpecialKeysOrShift = hasSpecialKeys || e.shiftKey;
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switch (e.keyCode) {
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case KEY.UNKNOWN: // Special key released
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case KEY.SHIFT:
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case KEY.CTRL:
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case KEY.ALT:
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case KEY.RETURN: // we don't want to suggest when RETURN key has pressed (another IE workaround)
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break;
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case KEY.TAB:
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if (!hasSpecialKeysOrShift && $area.options.cycleOnTab) {
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break;
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}
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case KEY.ESC:
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case KEY.BACKSPACE:
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case KEY.DEL:
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case KEY.UP:
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case KEY.DOWN:
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case KEY.LEFT:
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case KEY.RIGHT:
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if (!hasSpecialKeysOrShift && $area.options.autoComplete) {
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$area.replaceSelection("");
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}
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break;
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default:
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if (!hasSpecialKeys && $area.options.autoComplete) {
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var chunk = $area.getChunk();
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if (chunk.length >= $area.options.minChunkSize) {
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$area.updateSelection($area.getCompletion(false));
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}
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}
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break;
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}
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});
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return $area;
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};
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}(jQuery));
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