duel onclick client and server..?[RESOLVED]

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.

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

VB Code:

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.

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.....

to fire a button click event from client script

Code:

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__doPostBack('btn_id','');

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I just added this to my Base.Page class

Code:

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                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){}

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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.

Code:

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__doPostBack('PostBackCommand', 'command_name');

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

Code:

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onclick="clientScriptFunction()"

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

Code:

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__doPostBack('PostBackCommand','ButtonClick');

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

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.

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