I keep meaning to spend some time with Hippo.Net. The project that Jan Tielen is developing. It appears really promising.
Anytime something can take the tediousness out of the build process, I am all for it.
I am in the process of putting together an article for how to write a relatively unique custom control. During its writing, I had to force a post back within some client-side javascript. It is a pretty handy piece of code so I thought I would share it with the world.
First, in my aspx code, I put in this piece of code for a div tag.
|
onmousedown="javascript: <%#getPostBack()%>;" |
Next, I wrote the getPostBack piece of code.
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protected string getPostBack()
{
return this.Page.GetPostBackEventReference(this, "@@@@@buttonPostBack"");
} |
The getPostBack() method is taking advantage of the GetPostBackEventReference .net method call that enables you to hijack the same client-side javascript postback code for your own use. The second parameter enables you to create a custom event argument that is unique to your own uses. You will need this event argument later...
Next, we need to modify the Page_Load() code in order to determine when a postback occurred.
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protected void Page_Load(object sender, System.EventArgs e)
{
// this Is a postback, then we care
if( this.IsPostBack )
{
// determine who caused the post back
string eventArg = Request[ "__EVENTARGUMENT" ];
// if null ( could it ever be null? )
if( eventArg != null )
{
// this post back can occur if we raise the event or if the Web Form itself raises the event.
// therefore, i always like to put something in the eventarg that lets me identify it as an event
// that i raised. i use @@@@@. but you can use whatever you like, just make sure it is unique.
// i also like to make the ClientId part of the value if i am posting back within a user control or
// custom control. including the ClientId in a user or custom control enables me to programmatically
// determine which instance of the control executed the postback. again we do this because all postbacks
// for all instances of all controls on the page are being funneled through this one method.
int offset = eventArg.IndexOf( "@@@@@" );
if( offset > -1 )
{
// this is an event that we raised. so do whatever you need to here.
}
}
}
} |
Hope this helps someone out in VirtualWorld. As always, comments and feedback are appreciated.
Mathew
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