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[英]ASP Dropdownlist is not recognized in C# code when it is in GridView
[英]dropdownlist values from jquery are not recognized in c# code behind
我試圖從asp.net dropdownlist控件中獲取選定的項目,該控件是從jquery ajax調用中填充的。 我能夠遍歷屏幕上的項目,請參閱頁面源代碼中隨附的選項,但是當我嘗試從c#后端代碼獲取值時,我得到的是空白值。 這就是我所擁有的:
$('#<%=Button2.ClientID %>').click(function () {
var Dropdown2 = $('#<%=ddlListAgents.ClientID %>');
Dropdown2.empty();
$.ajax({
type: "POST",
url: "WebForm3.aspx/fetchData",
data: "{selectedAgent: '" + $('#<%=txtAgentNameText.ClientID %>').val() +"'}",
contentType: "application/json; charset=utf-8",
dataType: "json",
success: function (response) {
Dropdown2.append(new Option("--Select Agent --", 0));
$.each(response.d, function (index, item) {
Dropdown2.append(new Option(item.Name, item.ID));
});
},
error: function (xhr, ajaxOptions, thrownError) {
alert(xhr.status);
alert(thrownError);
}
});
});
打電話后一切都設置好,我可以瀏覽選項。 但是,當我單擊按鈕並嘗試在此代碼(測試代碼)中獲取選定的值時:
protected void btnSelectAgentAdd_ServerClick(object sender, EventArgs e)
{
foreach (ListItem item in ddlListAgents.Items)
{
if (item.Selected.Equals(true))
{
item.Value.ToString();
}
else
{
item.Value.ToString();
}
}
string one = ddlListAgents.SelectedValue;
}
在第一個循環之后,代碼將從for循環中退出,並且ddlListAgents.SelectedValue等於空字符串。
這是我用來獲取數據集的方法:
[WebMethod]
public static List<AgentName> fetchData(string selectedAgent)
{
Dictionary<string, string> list = new Dictionary<string, string>();
BL.Client client = new BL.Client();
var agents = new List<AgentName>();
if (selectedAgent != string.Empty)
{
list = client.GetAgentNamesForPopupSearch(selectedAgent);
}
foreach (KeyValuePair<string, string> val in list)
{
agents.Add(new AgentName { ID = Convert.ToInt32(val.Key), Name = val.Value });
}
return agents;
}
歡迎任何建議。 在此先感謝Laziale
編輯:添加頁面加載事件:
if (!IsPostBack)
{
Dictionary<string, string> list = new Dictionary<string, string>();
BL.Client client = new BL.Client();
list = client.GetAgentNamesForPolicies2(Convert.ToInt32(4));
ddlAgentName.DataSource = list;
ddlAgentName.DataTextField = "Value";
ddlAgentName.DataValueField = "Key";
ddlAgentName.DataBind();
ddlAgentName.Items.Insert(0, new ListItem("-- Select Agent --", string.Empty));
}
string selectedValue = Request.Form[ddlLanguage.UniqueID];
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