Possible Duplicate:
Javascript that executes after page load
i have application in asp.net 4.0
i have javascript to display client zone offset into text box:- `
<script type="text/javascript">
function GetTimeZoneOffset() {
var d = new Date()
var gmtOffSet = -d.getTimezoneOffset();
var gmtHours = Math.floor(gmtOffSet / 60);
var GMTMin = Math.abs(gmtOffSet % 60);
var dot = ".";
var retVal = "" + gmtHours + dot + GMTMin;
document.getElementById('<%= offSet.ClientID%>').value = retVal;
}
</script>
`
Html MarkUp
<asp:HiddenField ID="clientDateTime" runat="server" />
<asp:HiddenField ID="offSet" runat="server" />
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox></body>
How can I call this function on page load so that I can display offset into textbox?
This question is related to
javascript
asp.net
Calling JavaScript function on code behind i.e.
On Page_Load
ClientScript.RegisterStartupScript(GetType(), "Javascript", "javascript:FUNCTIONNAME(); ", true);
If you have UpdatePanel there then try like this
ScriptManager.RegisterStartupScript(GetType(), "Javascript", "javascript:FUNCTIONNAME(); ", true);
View Blog Article : How to Call javascript function from code behind in asp.net c#
<html>
<head>
<script type="text/javascript">
function GetTimeZoneOffset() {
var d = new Date()
var gmtOffSet = -d.getTimezoneOffset();
var gmtHours = Math.floor(gmtOffSet / 60);
var GMTMin = Math.abs(gmtOffSet % 60);
var dot = ".";
var retVal = "" + gmtHours + dot + GMTMin;
document.getElementById('<%= offSet.ClientID%>').value = retVal;
}
</script>
</head>
<body onload="GetTimeZoneOffset()">
<asp:HiddenField ID="clientDateTime" runat="server" />
<asp:HiddenField ID="offSet" runat="server" />
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
</body>
</html>
key point to notice here is,body has an attribute onload. Just give it a function name and that function will be called on page load.
Alternatively, you can also call the function on page load event like this
<html>
<head>
<script type="text/javascript">
window.onload = load();
function load() {
var d = new Date()
var gmtOffSet = -d.getTimezoneOffset();
var gmtHours = Math.floor(gmtOffSet / 60);
var GMTMin = Math.abs(gmtOffSet % 60);
var dot = ".";
var retVal = "" + gmtHours + dot + GMTMin;
document.getElementById('<%= offSet.ClientID%>').value = retVal;
}
</script>
</head>
<body >
<asp:HiddenField ID="clientDateTime" runat="server" />
<asp:HiddenField ID="offSet" runat="server" />
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox></body>
</body>
</html>
use your code within
<script type="text/javascript">
function window.onload()
{
var d = new Date()
var gmtOffSet = -d.getTimezoneOffset();
var gmtHours = Math.floor(gmtOffSet / 60);
var GMTMin = Math.abs(gmtOffSet % 60);
var dot = ".";
var retVal = "" + gmtHours + dot + GMTMin;
document.getElementById('<%= offSet.ClientID%>').value = retVal;
}
</script>
Place this line before the closing script tag,writing from memory:
window.onload = GetTimeZoneOffset;
i think the question is how to call the javascript function on pageload
Source: Stackoverflow.com