|
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
Announcements
Chapters
Services
Feature Zones
|
IntroductionOne can find this article useful during development phase of a web application. One requires functionalities such as calling JavaScript client side code for validation, confirm popup, prompting user for unwanted action etc. at server side code behind. Implementation
So we start with an example through code. RegisterStartupScriptUsing Calling & writing JavaScript function from server side code behindprivate void Page_Load(object sender, System.EventArgs e)
{
string jScriptValidator;
jScriptValidator="<script> function ReqFieldValidator()" +
" { if (document.forms[0].txtField.value == '') \n";
jScriptValidator+="{ alert('TextBox cannot be empty') \n ";
jScriptValidator+="return false; \n";
jScriptValidator+="} \n";
jScriptValidator+=" return true \n";
jScriptValidator+=" } </script>";
Page.RegisterStartupScript("regJSval",jScriptValidator);
btnSubmit.Attributes.Add("onclick","return ReqFieldValidator()");
}
Writing JavaScript function in server side code behind and calling from HTML//Server side
private void Page_Load(object sender, System.EventArgs e)
{
string jScript;
jScript="<script>function JavScriptFn(){alert" +
" ('Client Function in javascript is call')}</script>";
}//HTML side
< A onclick="JavScriptFn()" >
< asp:Label id="Label1" runat="server" Width="281px"
ForeColor="#8080FF">Click to call Javascript function.
</asp:Label> >/A >
Writing JavaScript in HTML and calling it from code-behind <Head >
<script>
function ReqField1Validator()
{
if (document.forms[0].txtField1.value == '')
{
alert('TextBox cannot be empty')
return false
}
return true
}
</script>
</Head >private void Page_Load(object sender, System.EventArgs e)
{
btnOK.Attributes.Add("onclick","return ReqField1Validator()");
}
RegisterClientScriptBlockSuppose we want JavaScript code to be executed but not a function. In that case we make use of private void btnClientBlock_Click(object sender, System.EventArgs e)
{
string jScript;
jScript="<script>alert ('Javascript block of code executed')</script>";
Page.RegisterClientScriptBlock("keyClientBlock",jScript);
lblSequencial.Text="Remaining part of the code executed";
}
Hope you find the above article helpful. Any suggestions are most welcome.
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
. 
; 
News 
Joke 
Rant 
Admin