Set TextBox value using javascript on ButtonClick in ASP.NET

Question

I have searched alot but i didn't find any good answer. My Question is:

I want to set the value of a asp.net textbox using external javascript file.

 function setvalue() { document.getElementById('<%=txtbox1.ClientID %>').value = "Hello World"; } 

 <asp:TextBox runat="server" ID="txtbox1" /> <asp:Button runat="server" OnClientClick="setvalue();" Text="SetValue" /> 

i have found some answer but they used internal javascript. I don't know how to do it. Please Help.

Answer 1

Just pass the textbox's ID as parameter, like this

function setvalue(textBoxID)
{
  document.getElementById(textBoxID).value = "Hello World";
}

and in your main file (asp/aspx) call it like this

OnClientClick="setvalue('<%=txtbox1.ClientID %>');"