EXTJS7 combobox 下拉加載數據源碼

Trigger.js

onClick: function(e) {
	var me = this,
	    handler = !me.getDisabled() && me.getHandler(),
	    field = me.getField(),
	    focusEl;
	...
	// handler = 'onExpandTap' 觸發combobox展開按鈕點擊處理函數
	    if (handler) {
	        Ext.callback(handler, me.getScope(), [field, me, e], null, field);
	    }
	}
},

Combobox.js

// 更新store
updateStore: function(store, oldStore) {
    var me = this,
    	// 獲取combobox queryMode 默認值是remote
        isRemote = me.getQueryMode() === 'remote',
    ...
    // 如果是遠端查詢模式,則設置store remoteFilter=true,此項將影響store應用過濾時是否重新加載數據
    if (isRemote) {
        store.setRemoteFilter(true);
	...
},
// 展開按鈕點擊處理函數
onExpandTap: function() {
    var me = this,
    ...
    if (me.expanded) {
        ...
    }
    else if (!me.getReadOnly() && !me.getDisabled()) {
    	// 根據commbobox配置項triggerAction過濾數據,默認爲all
        if (triggerAction === 'all') {
            me.doFilter({
                query: me.getAllQuery(),
                force: true // overrides the minChars test
            });
        }
        else if (triggerAction === 'last') {
            me.doFilter({
                query: me.lastQuery.query,
                force: true // overrides the minChars test
            });
        }
        else {
            me.doFilter({
                query: me.inputElement.dom.value
            });
        }
    }
}
// 過濾下拉框數據
doFilter: function(query) {
	...
	// 發送過濾器集合endupdate事件,觸發store執行數據過濾
	filters.endUpdate();
	...        
},

AbstractStore.js

onFilterEndUpdate: function() {
	...
	// 如果是遠端過濾,則需要重新加載數據
	if (me.getRemoteFilter()) {
	   ...
	    if (!suppressNext) {
	    	// 加載數據
	        me.load();
	    }
	}
	...
}