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- focusFirstElement: function(form) {
- var form = $(form);
- var elements = Form.getElements(form);
- for (var i = 0; i < elements.length; i++) {
- var element = elements[i];
- if (element.type != 'hidden' && !element.disabled) {
- Field.activate(element);
- break;
- }
- }
- },
- reset: function(form) {
- $(form).reset();
- }
- }
- Form.Element = {
- serialize: function(element) {
- var element = $(element);
- var method = element.tagName.toLowerCase();
- var parameter = Form.Element.Serializers[method](element);
-
- if (parameter)
- return encodeURIComponent(parameter[0]) + '=' +
- encodeURIComponent(parameter[1]);
- },
-
- getValue: function(element) {
- var element = $(element);
- var method = element.tagName.toLowerCase();
- var parameter = Form.Element.Serializers[method](element);
-
- if (parameter)
- return parameter[1];
- }
- }
- Form.Element.Serializers = {
- input: function(element) {
- switch (element.type.toLowerCase()) {
- case 'submit':
- case 'hidden':
- case 'password':
- case 'text':
- return Form.Element.Serializers.textarea(element);
- case 'checkbox':
- case 'radio':
- return Form.Element.Serializers.inputSelector(element);
- }
- return false;
- },
- inputSelector: function(element) {
- if (element.checked)
- return [element.name, element.value];
- },
- textarea: function(element) {
- return [element.name, element.value];
- },
- select: function(element) {
- var value = '';
- if (element.type == 'select-one') {
- var index = element.selectedIndex;
- if (index >= 0)
- value = element.options[index].value || element.options[index].text;
- } else {
- value = new Array();
- for (var i = 0; i < element.length; i++) {
- var opt = element.options[i];
- if (opt.selected)
- value.push(opt.value || opt.text);
- }
- }
- return [element.name, value];
- }
- }
- /*--------------------------------------------------------------------------*/
- var $F = Form.Element.getValue;
- /*--------------------------------------------------------------------------*/
- Abstract.TimedObserver = function() {}
- Abstract.TimedObserver.prototype = {
- initialize: function(element, frequency, callback) {
- this.frequency = frequency;
- this.element = $(element);
- this.callback = callback;
-
- this.lastValue = this.getValue();
- this.registerCallback();
- },
-
- registerCallback: function() {
- setInterval(this.onTimerEvent.bind(this), this.frequency * 1000);
- },
-
- onTimerEvent: function() {
- var value = this.getValue();
- if (this.lastValue != value) {
- this.callback(this.element, value);
- this.lastValue = value;
- }
- }
- }
- Form.Element.Observer = Class.create();
- Form.Element.Observer.prototype = (new Abstract.TimedObserver()).extend({
- getValue: function() {
- return Form.Element.getValue(this.element);
- }
- });
- Form.Observer = Class.create();
- Form.Observer.prototype = (new Abstract.TimedObserver()).extend({
- getValue: function() {
- return Form.serialize(this.element);
- }
- });
- /*--------------------------------------------------------------------------*/
- Abstract.EventObserver = function() {}
- Abstract.EventObserver.prototype = {
- initialize: function(element, callback) {
- this.element = $(element);
- this.callback = callback;
-
- this.lastValue = this.getValue();
- if (this.element.tagName.toLowerCase() == 'form')
- this.registerFormCallbacks();
- else
- this.registerCallback(this.element);
- },
-
- onElementEvent: function() {
- var value = this.getValue();
- if (this.lastValue != value) {
- this.callback(this.element, value);
- this.lastValue = value;
- }
- },
-
- registerFormCallbacks: function() {
- var elements = Form.getElements(this.element);
- for (var i = 0; i < elements.length; i++)
- this.registerCallback(elements[i]);
- },
-
- registerCallback: function(element) {
- if (element.type) {
- switch (element.type.toLowerCase()) {
- case 'checkbox':
- case 'radio':
- element.target = this;
- element.prev_onclick = element.onclick || Prototype.emptyFunction;
- element.onclick = function() {
- this.prev_onclick();
- this.target.onElementEvent();
- }
- break;
- case 'password':
- case 'text':
- case 'textarea':
- case 'select-one':
- case 'select-multiple':
- element.target = this;
- element.prev_onchange = element.onchange || Prototype.emptyFunction;
- element.onchange = function() {
- this.prev_onchange();
- this.target.onElementEvent();
- }
- break;
- }
- }
- }
- }
- Form.Element.EventObserver = Class.create();
- Form.Element.EventObserver.prototype = (new Abstract.EventObserver()).extend({
- getValue: function() {
- return Form.Element.getValue(this.element);
- }
- });
- Form.EventObserver = Class.create();
- Form.EventObserver.prototype = (new Abstract.EventObserver()).extend({
- getValue: function() {
- return Form.serialize(this.element);
- }
- });
- if (!window.Event) {
- var Event = new Object();
- }
- Object.extend(Event, {
- KEY_BACKSPACE: 8,
- KEY_TAB: 9,
- KEY_RETURN: 13,
- KEY_ESC: 27,
- KEY_LEFT: 37,
- KEY_UP: 38,
- KEY_RIGHT: 39,
- KEY_DOWN: 40,
- KEY_DELETE: 46,
- element: function(event) {
- return event.target || event.srcElement;
- },
- isLeftClick: function(event) {
- return (((event.which) && (event.which == 1)) ||
- ((event.button) && (event.button == 1)));
- },
- pointerX: function(event) {
- return event.pageX || (event.clientX +
- (document.documentElement.scrollLeft || document.body.scrollLeft));
- },
- pointerY: function(event) {
- return event.pageY || (event.clientY +
- (document.documentElement.scrollTop || document.body.scrollTop));
- },
- stop: function(event) {
- if (event.preventDefault) {
- event.preventDefault();
- event.stopPropagation();
- } else {
- event.returnValue = false;
- }
- },
- // find the first node with the given tagName, starting from the
- // node the event was triggered on; traverses the DOM upwards
- findElement: function(event, tagName) {
- var element = Event.element(event);
- while (element.parentNode && (!element.tagName ||
- (element.tagName.toUpperCase() != tagName.toUpperCase())))
- element = element.parentNode;
- return element;
- },
- observers: false,
-
- _observeAndCache: function(element, name, observer, useCapture) {
- if (!this.observers) this.observers = [];
- if (element.addEventListener) {
- this.observers.push([element, name, observer, useCapture]);
- element.addEventListener(name, observer, useCapture);
- } else if (element.attachEvent) {
- this.observers.push([element, name, observer, useCapture]);
- element.attachEvent('on' + name, observer);
- }
- },
-
- unloadCache: function() {
- if (!Event.observers) return;
- for (var i = 0; i < Event.observers.length; i++) {
- Event.stopObserving.apply(this, Event.observers[i]);
- Event.observers[i][0] = null;
- }
- Event.observers = false;
- },
- observe: function(element, name, observer, useCapture) {
- var element = $(element);
- useCapture = useCapture || false;
-
- if (name == 'keypress' &&
- ((navigator.appVersion.indexOf('AppleWebKit') > 0)
- || element.attachEvent))
- name = 'keydown';
-
- this._observeAndCache(element, name, observer, useCapture);
- },
- stopObserving: function(element, name, observer, useCapture) {
- var element = $(element);
- useCapture = useCapture || false;
-
- if (name == 'keypress' &&
- ((navigator.appVersion.indexOf('AppleWebKit') > 0)
- || element.detachEvent))
- name = 'keydown';
-
- if (element.removeEventListener) {
- element.removeEventListener(name, observer, useCapture);
- } else if (element.detachEvent) {
- element.detachEvent('on' + name, observer);
- }
- }
- });
- /* prevent memory leaks in IE */
- Event.observe(window, 'unload', Event.unloadCache, false);
- var Position = {
- // set to true if needed, warning: firefox performance problems
- // NOT neeeded for page scrolling, only if draggable contained in
- // scrollable elements
- includeScrollOffsets: false,
- // must be called before calling withinIncludingScrolloffset, every time the
- // page is scrolled
- prepare: function() {
- this.deltaX = window.pageXOffset
- || document.documentElement.scrollLeft
- || document.body.scrollLeft
- || 0;
- this.deltaY = window.pageYOffset
- || document.documentElement.scrollTop
- || document.body.scrollTop
- || 0;
- },
[ 本帖最后由 csona 于 2005-12-10 04:47 编辑 ] |
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发表于 2005-12-10 04:44
发表于 2005-12-10 12:16
