ajaxRequest() method
Client-side method to trigger a partial PostBack/AJAX request using the Telerik WebForms AjaxManager component.
Usage
ajaxRequest(eventArgument) method takes one parameter.
Parameters
| Parameter | Type | Description |
|---|---|---|
eventArgument |
string |
The string data you want to pass as along (e.g. text, JSON string, etc.) |
Example
<telerik:RadAjaxManager ID="RadAjaxManager1" runat="server" OnAjaxRequest="RadAjaxManager1_AjaxRequest">
</telerik:RadAjaxManager>
<telerik:RadButton runat="server" ID="RadButton1" Text="Make an AJAX Request" AutoPostBack="false" OnClientClicked="OnClientClicked" />
<telerik:RadScriptBlock ID="RadScriptBlock1" runat="server">
<script>
function OnClientClicked(){
var ajaxManager = $find("<%= RadAjaxManager1.ClientID %>");
// Trigger AJAX request without parameter
ajaxManager.ajaxRequest('');
// Trigger AJAX request with parameter
ajaxManager.ajaxRequest('MyStringValue');
// Trigger AJAX request with JSON string as parameter
// JSON Object
var jsonObject = {
"field1": "value1",
"field2": "value2",
"field3": "value3",
}
// JSON String
var jsonString = JSON.stringify(jsonObject);
// Send JSON string as parameter
ajaxManager.ajaxRequest(jsonString);
}
</script>
</telerik:RadScriptBlock>
protected void RadAjaxManager1_AjaxRequest(object sender, Telerik.Web.UI.AjaxRequestEventArgs e)
{
}
Protected Sub RadAjaxManager1_AjaxRequest(ByVal sender As Object, ByVal e As Telerik.Web.UI.AjaxRequestEventArgs)
End Sub
If you send a JSON string, you can deserialize it to an object, see How to serialize and deserialize (marshal and unmarshal) JSON in .NET and Deserialize an Object - Newtonsoft
Access the values on Server
Upon making an AJAX Request the AjaxManager triggers its AjaxRequest Server-side event where the e.Argument will contain the parameter values.
Example
protected void RadAjaxManager1_AjaxRequest(object sender, Telerik.Web.UI.AjaxRequestEventArgs e)
{
RadAjaxManager ajaxManager = (RadAjaxManager)sender;
// MyStringValue
// '{\"field1\":\"value1\",\"field2\":\"value2\",\"field3\":\"value3\"}
string myArgument = e.Argument;
if (myArgument == "MyString")
{
// do something
}else
{
// In case deserializing JSON object
try
{
// Deserialize myArgument
// do the rest
}
catch (Exception ex)
{
// Handle the exception
// or
// send and alert back to the client using AjaxManager
ajaxManager.Alert(string.Format("Error: {0}\n{1}", ex.Message, "Please review the JSON string and ensure it corresponds to the Object structure you want to Deserialize into."));
}
}
}
Protected Sub RadAjaxManager1_AjaxRequest(ByVal sender As Object, ByVal e As Telerik.Web.UI.AjaxRequestEventArgs)
Dim ajaxManager As RadAjaxManager = CType(sender, RadAjaxManager)
Dim myArgument As String = e.Argument
If myArgument = "MyString" Then
'do something
Else
'In case deserializing JSON object
Try
'Deserialize myArgument
'do the rest
Catch ex As Exception
'Handle the exception
'or
'send and alert back to the client using AjaxManager
ajaxManager.Alert(String.Format("Error: {0}" & vbLf & "{1}", ex.Message, "Please review the JSON string and ensure it corresponds to the Object structure you want to Deserialize into."))
End Try
End If
End Sub