easyui的combobox下拉框初始化默认值以及保持该值一直显示的方法

easyui的combobox下拉框默认初始值是空,下面是实现从远程加载数据之后初始化默认值,以及让该值一直排在下拉框的最顶部的方式。

目前的需求是需要在初始化的时候添加"全部数据库"字段,并且在下拉的时候,"全部数据库"一直排在最顶部。

初始化效果如下:

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下拉之后的效果如下:

aaarticlea/png;base64,iVBORw0KGgoAAAANSUhEUgAAAMkAAABpCAIAAAAfuJC8AAAFw0lEQVR4nO2dPYrjSBiG6xq6g5BB0VxBycAwIJheWXfwCRTaCvYAirXJzKzBbCrYyGHDYvABBjZR4Ky7g+4OvIH+SlVflbRtff7pfl+ewC6XqtXWw/eV1AMjfh2OAHAgLn4G4L0CtwAXcAtwAbcAF3ALcAG3ABfi97/+BYADkRUlAByII4LwBG4hXIFbCFfgFsIVuIVwBW4hXIFbCFfgFsIVuIVwBW4hXIFbCFfgFsIVuIVwBW4hXIFbCFfEH3/vAZic2q378h8ASH4dnt8A3ALDwC3ABdwCXJzqlhBCCHHxXwN*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" alt="" />

实现方式:

easyui的combobox有一个loader属性,easyui的API对loader属性说明如下:

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" alt="" />

easyui的combobox有一个onLoadSuccess事件,easyui的API对onLoadSuccess事件说明如下:

aaarticlea/png;base64,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" alt="" />

实现方式就是综合利用easyui的loader属性和onLoadSuccess事件。

完整的代码如下所示(请关注重点代码,红色标注的部分):

<input id="dBName" name="dBName" class="easyui-combobox" style="width: 200px"
data-options="
valueField: 'dbname',
textField: 'dbname',
editable:false,
loader:function(param,success,error){
$.ajax({
url: '${pageContext.request.contextPath}/rds/rds_findRdsDatabases.action?dbinstanceid=${param.dbinstanceid}',
dataType: 'json',
success: function(data){
data.rows.unshift({dbname:'',dbname:'全部数据库'});
success(data.rows); //loader的success
}
});
},
onLoadSuccess:function(){
$('#dBName').combobox('setValue','全部数据库');
}
"/>

上面的方法unshift()会将一个或多个元素添加到数组的头部,然后把已有的元素移动到下标较大的位置一腾出空间,它返回的是数组的新长度。

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