Calling Page Method


Today I will tell you how to call a page method using ajax request.
AjaxRequest.aspx
<script type="text/javascript" src="Scripts/jquery-1.7.2.js"></script>
<script type="text/javascript">
   $(document).ready(function()
   {
  
    $("#btnGetData").click(function()
    {
    
    $.ajax({
      type: "POST",
      url: "AjaxRequest.aspx/GetData",
      data: "{}",
      contentType: "application/json; charset=utf-8",
      dataType: "json",
      success: function(msg) {
      $("#GetData").append(msg.d);
      }
    });
  });
  });
    </script>
<div id="Data">
    To get data using ajax request click on this button.<br />
    <input type="button" id="btnGetData" value="Get Data" />
   
    <div id="GetData">
   
    </div>
   
    </div>
AjaxRequest.aspx.cs
[System.Web.Services.WebMethod]
    public static string GetData()
    {
        string query = "select * from employee";
        DataTable dt = new DataTable();
        DataAccess da = new DataAccess();
        da.FillGrid(dt, query);
        string table = "<table><tr><td>This data is returned using ajax call.</td></tr>";
        table += "<tr><td>Id</td><td>Name</td></tr>";
        foreach (DataRow dr in dt.Rows)
        {
            table += "<tr><td>" + dr[0].ToString() + "</td><td>"+dr[1].ToString()+"</td></tr>";
        }
        table += "</table>";
        return table;
    }
Now let’s discuss in detail.$.ajax has some parameters I will discuss only some important things in it.
·         URL :This is the url of your web page and after that comes your method name.i-e mypage.aspx/mymethod.
·         Data: if your method accepts some arguments you need to pass them here and argument name must be same as in the method. i-e suppose you have a method which accepts an argument public static string GetName(string name) so when you will call it you will pass it like data: "{name:'"+somename+"'}".
·         Success: When your method is called successfully you can write code here what you want after success. You can call another function in it.
·         The method in cs class should be webmethod and should be static.
Now in this example I have a query which returns data and I have created an HTML table using data retrieved from database and returned that data and in my page I have appended this data to a div.

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