判空D一种方式:
var sValue = $('#selGlade').combobox('getValue');
if (sValue == "") {
$.messager.alert("错误", "请选择年级!","info");
return false;
}
加入 请选择:
前端方法:
var DicHandler = "....";
function Combobox(id, type) {
$('#' + id).combobox({
url: DicHandler + "&type=" + type,
valueField: 'value',
textField: 'text',
130
});
}
后台代码:
public static List<ComboItem> ComboBox(DataSet ds, string value, string text, bool flag)
{
List<ComboItem> lst = new List<ComboItem>();
ComboItem item = new ComboItem();
if (flag)
{
item.text = "<-- 请选择 -->";
item.value = "";
lst.Add(item);
}
foreach (DataRow dr in ds.Tables[0].Rows)
{
ComboItem items = new ComboItem();
items.value= dr[value].ToString();
items.text = dr.ToString();
lst.Add(items);
}
return lst;
}
public class ComboItem {
public string id { get; set; }
public string text { get; set; }
}
context.Response.Write(JsonConverter.Parse(EasyJson.ComboBox(ds, "Id", "GradeName", true)));
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