如何添加一个空项目到ExtJS组合框? [英] How to add an empty item to ExtJS combobox?
问题描述
我想添加和清空项目(显示值为空,项目高度保持正常)到Ext.form.ComboBox。我在下面提到了2个链接来配置我的组合框,但它仍然不显示空项目:
I want to add and empty item (display value is blank, item height is kept as normal) to an Ext.form.ComboBox. I refered 2 links below to configure my combobox, but it still not display the empty item:
- http://www.ashlux.com/wordpress/2009 / 09/04 / handling-empty-options-with-ext-js-combo-box /
- http://www.sencha.com/forum/showthread .php?52340-How-to-add-a----blank-quot-entry-to-a-ComboBox
- http://www.ashlux.com/wordpress/2009/09/04/handling-empty-options-with-ext-js-combo-box/
- http://www.sencha.com/forum/showthread.php?52340-How-to-add-a-quot-blank-quot-entry-to-a-ComboBox
这是我的代码:
this.abcCombo = new Ext.form.ComboBox({
name : 'abcCombo',
hiddenName : 'abcCombo-id',
fieldLabel : "My Combobox",
width : 250,
editable : false,
forceSelection : true,
mode : 'local',
triggerAction : 'all',
valueField : 'id',
displayField : 'fullName',
store : new Ext.data.JsonStore({
fields : ['id', 'fullName']
}),
tpl : '<tpl for="."><div class="x-combo-list-item">{fullName} </div></tpl>'
});
组合框商店的数据将在Ajax请求之后加载(即数据项中的3个项目)。而组合框只有3个项目(不是我预期的4个)。
你有什么想法我的问题吗?
非常感谢!
The combobox store's data will be loaded after an Ajax request (i.e 3 items in data items). And the combobox has only 3 item (not 4 as I expected). Do you have any idea about my problem?! Thank you so much!
推荐答案
由于您稍后添加组合框值,为什么不用一个初始化商店空值:
Since your adding the combobox values later, why not just initialize the store with one blank value:
store : new Ext.data.JsonStore({
fields : ['id', 'fullName'],
data : [{id: 0, fullName: ''}]
}),
稍后,当您执行 store.add(theRestOfThem)
时,空白的仍然会存在。
Later when you do store.add(theRestOfThem)
, that blank one will still be there.
今天(2017年4月15日)为ExtJS 4.2重新访问:
最简单的方法是将一个空字符串如上所述,也可以在商店中使用负载监听器:
The easiest way is to include an empty string in the store as above, it can also be done with a load listener on the store:
listeners:
{
load: function(store, records)
{
store.insert(0, [{
fullName: '',
id: null
}]);
}
}
然后添加一个 tpl
配置到具有& nbsp;
的组合框显示字段后:
Then add a tpl
config to the combobox with
after the display field:
tpl: '<tpl for="."><div class="x-boundlist-item">{fullName} </div></tpl>',
(显示字段为 fullName
在OPs案例中)
(the display field is fullName
in the OPs case)
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