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Get TextBox Value from GridView using JavaScript

Today we will See How to Get TextBox value from GridView using JavaScript..?
 
First Design Gridview as:
  1. <asp:GridView ID="GVReue" runat="server" ">  
  2.    <Columns>  
  3.       <asp:TemplateField HeaderText="Item Name">  
  4.          <ItemTemplate>  
  5.             <asp:Label ID="lblItemName" Text=' <%# Eval("fldItemName") %>'  
  6. runat="server"></asp:Label>  
  7.          </ItemTemplate>  
  8.       </asp:TemplateField>  
  9.       <asp:TemplateField HeaderText="Quantity">  
  10.          <ItemTemplate>  
  11.             <asp:TextBox ID="txtQty" ToolTip=' <%# Eval("fldQuntity") %>' onblur="Calculation(this.value)"  
  12. runat="server" />  
  13.          </ItemTemplate>  
  14.       </asp:TemplateField>  
  15.    </Columns>  
  16.    <EmptyDataTemplate>  
  17.       No Record Found....!!!  
  18.    </EmptyDataTemplate>  
  19. </asp:GridView>  
Design as:
 
Design
 
Then Use Script in Head tag as:
  1. <script type="text/javascript">  
  2.    function Calculation() {  
  3.       var grid = document.getElementById("<%= GVReue.ClientID%>");  
  4.       for (var i = 0; i < grid.rows.length - 1; i++) {  
  5.          var txtAmountReceive = $("input[id*=txtQty]")  
  6.             if (txtAmountReceive[i].value != '') {  
  7.                alert(txtAmountReceive[i].value);  
  8.             }  
  9.       }  
  10.    }  
  11. </script>  
Then Get value of TxtQty Textbox as
 
Get value of TxtQty