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JAVASCRIPTAJAX刷新很慢
JEASearch = new Class({
Implements: [Options],
form: null,
forceUpdateLists : false,
options: {
fields : {
filter_search : "",
filter_area_id : 0,
filter_department_id : 0,
filter_town_id : 0
},
useAJAX : true
},
initFieldBehavior : function(fieldName) {
if (this.form[fieldName]) {
if (typeOf(this.form[fieldName]) == 'element') {
var field = document.id(this.form[fieldName]);
field.addEvent('change', function(event) {
this.forceUpdateLists = false;
this.options.fields[fieldName] = field.get('value');
this.refresh();
}.bind(this));
} else if (typeOf(this.form[fieldName]) == 'collection') {
if (fieldName == 'filter_amenities[]') {
Array.from(this.form['filter_amenities[]']).each(function(item) {
item.addEvent('change', function(event) {
var index = this.options.fields.filter_amenities.indexOf(item.get('value'));
this.forceUpdateLists = true;
if (item.get('checked') && index == -1) {
this.options.fields.filter_amenities.push(item.get('value'));
} else if (!item.get('checked') && index > -1){
this.options.fields.filter_amenities.splice(index, 1);
}
this.refresh();
}.bind(this));
}.bind(this));
} else if (fieldName == 'filter_transaction_type') {
Array.from(this.form['filter_transaction_type']).each(function(item) {
item.addEvent('change', function(event) {
this.forceUpdateLists = true;
if (item.get('checked')) {
this.options.fields.filter_transaction_type = item.get('value');
}
this.refresh();
}.bind(this));
}.bind(this));
}
}
}
},
refresh: function() {
if (this.options.useAJAX) {
var jSonRequest = new Request.JSON({
url: 'index.php?option=com_jea&task=properties.search&format=json',
onSuccess: function(response) {
this.appendList('filter_area_id', response.areas);
this.appendList('filter_department_id', response.departments);
this.appendList('filter_town_id',response.towns);
this.form.getElements('.jea-counter-result').each(function(item){
item.set('text', response.total);
});
}.bind(this)
});
jSonRequest.post(this.options.fields);
}
},
reset : function() {
this.options.fields = {
filter_search : "",
filter_area_id : 0,
filter_department_id : 0,
filter_town_id : 0
};
for (var fieldName in this.options.fields) {
if (this.form[fieldName]) {
if (typeOf(this.form[fieldName]) == 'element') {
var field = document.id(this.form[fieldName]);
if (field.get('tag') == 'select') {
field.set('selectedIndex', 0);
}
field.set('value', '');
} else if (typeOf(this.form[fieldName]) == 'collection') {
Array.from(this.form[fieldName]).each(function(item) {
item.set('checked', '');
});
}
}
}
this.refresh(fast);
},
appendList : function(selectName, objectList) {
if (this.form[selectName]) {
var selectElt = document.id(this.form[selectName]);
// Update the list only if its value equals 0
// Or if this.forceUpdateLists is set to true
if (selectElt.get('value') == 0 || this.forceUpdateLists) {
var value = selectElt.get('value');
// Save the first option element
var first = selectElt.getFirst().clone();
selectElt.empty();
if (first.get('value') == 0) {
selectElt.adopt(first);
}
for (var i in objectList) {
if (objectList[i].text) {
var option = new Element('option', objectList[i]);
if (objectList[i].value == value) {
option.setProperty('selected', 'selected');
}
selectElt.adopt(option);
}
}
}
}
}
});
上面的代碼工作我的網站的搜索欄上。當我選擇一個省/地區/城市 - 那些選擇內容開放非常緩慢，當我選擇另一個省而沒有點擊搜索按鈕時，需要一些時間來打開區和城市...
我粘貼上面的JAVASCRIPT代碼。你能解釋一下這是什麼原因嗎？