duel onclick client and server..?[RESOLVED]

[Magiaus]

I want to have a client side script fire and then have postback fire

can anyone tell me about do_postback?

I want to fire a System.Web.UI.WebControls.Button Click event from a javascript click event.

[Fishcake]

i dabbled with this for a bit but the best i managed was causing a postback that made page_load get called but not the code for a button. I settled for just adding an onclick event for the button like

Me.btnCalculateScores.Attributes.Add("onclick", "return confirm('..... If you are sure you wish to continue click OK else click CANCEL');")

which just adds a javascript confirm box. I suppose it might depend on how complicated the javascript was though as to wether this is a suitable method for you.

[Magiaus]

I don't know yet. This is a fluff feature and I haven't got to it yet. I'll let you guys know what I come up with tough. I had seen article awhile back maybe I can find it again.....

[Magiaus]

to fire a button click event from client script

__doPostBack('btn_id','');

I just added this to my Base.Page class

		protected override void OnLoad(System.EventArgs e)
		{
			if(Request["__EVENTTARGET"] == "PostBackCommand" && Request["__EVENTARGUMENT"] != null && IsPostBack)
			{
				PostBackCommand(Request["__EVENTARGUMENT"]);
			}
		}
		/// <summary>
		/// Overide this member to add handling of Commands 
		/// raised from client script using __doPostBack(eventTarget, eventArgument).
		/// </summary>
		/// <param name="command">The command to execute.</param>
		protected virtual void PostBackCommand(string command){}

you overide PostBackCommand and use a select case/switch statement to act on diffrent commands bassed on the command string.

javascript to run a command from client/cause post back and proccess any PostBack Commands.

__doPostBack('PostBackCommand', 'command_name');

So using this system you would use a normal none server button with

onclick="clientScriptFunction()"

in the client script you then do what you need to with the client and then to prefom you server operation you call

__doPostBack('PostBackCommand','ButtonClick');

I think this can be very usefull. What do you guys say?

[hellswraith]

Great information. I never knew that was there. I don't use much javascript right now, but I can see a use for this.

Thanks.

[Magiaus]

new better solution http://vbforums.com/showthread.php?t=329597