onclientclick event

Question

Hi,

  

here is my aspx code: 

 

<div align="center" style="display:table;margin:auto"><asp:TextBox runat="server" ID="txtSearch" CssClass="search" placeholder="Enter Stock Number(or) Stock Description.." style="margin-left: 0" Width="367px" ForeColor="#00" ></asp:TextBox>

 

<asp:Button runat="server" ID="btnSearch" Text="Search" OnClick="btnSearch_Click" OnClientClick="displayalert()" ForeColor="#003c71"/></div>

</div>

 

itemtemplate in grid view:

 

<asp:TextBox runat="server" ID="txtQnty" Text='<%#Eval("Quantity") %>' ForeColor="#003c71"></asp:TextBox>

</ItemTemplate>

</asp:TemplateField>

 

<asp:TemplateField HeaderText="Update">

<ItemTemplate>

<asp:Button runat="server" ID="btnUpdate" Text="Update" OnClientClick="updatealert()" OnClick="btnUpdate_Click" ForeColor="#003c71"></asp:Button>

</ItemTemplate>

</asp:TemplateField>

 

my javascript code is:

 

<script type="text/javascript">

function displayalert()

{

if(document.getElementById("txtSearch").value == "")

{

alert("Enter stock number or stock description!");

return false;

}

}

</script>

<script type="text/javascript">

function updatealert()

{

if (document.getElementById("txtQnty").value == "") {

alert("Enter Quantity!");

return false;

}

else {

alert("Update Successfully!")

return true; 

}

}

</script>

<script type="text/javascript">

 

 why OnClientClick="updatealert()" is not working and displayalert() showing alert message but redirecting to error message!