所有
如何将从Web服务方法返回的下拉列表项数组绑定到ddlSubCategory asp.net服务器控件?这是我的代码。请参阅jquery OnSuccess方法中的注释:
<script type="text/javascript">
$(document).ready(function () {
$('#<%=ddlParentCategory.ClientID%>').change(function () {
var selectedParentCategory = getParentCategorySelectedValue();
var params= [];
params[id] = selectedParentCategory;
$.ajax({
type: "POST",
url: "MyWebService.asmx/GetSubCategoryItems",
data: params,
contentType: "application/json; charset=utf-8",
dataType: "json",
success: OnSuccess,
error: OnError
});
});
function OnSuccess(data, status) {
;// need to populate ddlSubCategory <asp:DropDownList on UI now
;// using returned array of drop down list items from the web service
}
function OnError(request, status, error) {
alert(request.statusText);
}
function getParentCategorySelectedValue() {
var SelectedVal = $('#<%=ddlParentCategory.ClientID %>').val();
return SelectedVal;
}
});
</script>
Here is my web service web method returning the array of list items:
[WebMethod]
public ListItem [] GetSubCategoryItems(int id)
{
using (var dc = MyDataContext.Open())
{
return dc.SubCategory
.OrderBy(sc => sc.Name)
.Select(sc => new ListItem()
{
Value = sc.ID.ToString(),
Text = sc.Name
})
.Prepend(new ListItem() {Value = "", Text = "Please Select"})
.ToArray();
}
}
感谢您的帮助!
答案 0 :(得分:1)
您可以尝试这样的事情:
function OnSuccess(data, status) {
// create a variable to the array
var list = data;
//get your combobox
var $select = $('#<%=ddlParentCategory.ClientID %>');
//check if it contains some items
if (list.length > 0) {
$select.empty().append('<option value="0">Please select...</option>');
$.each(list, function () {
$select.append($("<option></option>").val(this['Value']).html(this['Text']));
});
// $select.val(valueselected); //if you want to select a value... add this line
}
else //empty result from array
$select.empty().append('<option selected="selected" value="0">Empty...<option>');
}
我不知道你是从web服务中的web方法返回你的数组,但你必须考虑这些项目才能使它工作:
答案 1 :(得分:1)
function OnSuccess(data, status) {
var array = JSON.parse(data).toArray();
var ddl = $('#<%=ddlParentCategory.ClientID %>');
for (var item = 0; item < array.length; item++)
{
$(ddl).append($("<option>" + item + "</option>"))
}
}
更多信息可以在这里找到:http://www.dotnetfunda.com/articles/article999-dynamically-adding-an-item-in-a-dropdownlist-control.aspx 祝你好运。