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.NET Forum / ASP.NET / General / July 2007AJAX, Intercept Submit before it happens
Hi, I have an update panel with a Submit Button. ( AJAXified ) Is there a way, good way, of Intercepting a submit before it happens? I would like to do something in JavaScript before proceeding with the submit process. How to Inject such JavaScript from Code Behind? Thank You, Lit > Hi, > [quoted text clipped - 10 lines] > > Lit OnClientClick for the button. If you return TRUE, the action will occur. Larry, Excellent ( For the Submit Button ), What about something like a ListBox Control that does not have OnClientClick that I can see. Thanks for your quick reply. Lit. >> Hi, >> [quoted text clipped - 14 lines] > OnClientClick for the button. If you return TRUE, the action will > occur. > Excellent ( For the Submit Button ), What about something like a ListBox > Control that does not have OnClientClick that I can see. MyListBox.Attributes.Add("onclick", "alert('Clicked');");  SignatureMark Rae ASP.NET MVP http://www.markrae.net Mark, If I already have an onclick - server event, how do I Intercept before I post back? or how do I intercept the OnSelectedIndexChanged event in JavaScript. Is it called something else for the ListBox on the client side? Does the Client script event handler get executed then the server event handler after the post? Thank much for your time Lit >> Excellent ( For the Submit Button ), What about something like a ListBox >> Control that does not have OnClientClick that I can see. > > MyListBox.Attributes.Add("onclick", "alert('Clicked');"); > If I already have an onclick - server event, how do I Intercept before I > post back? Larry's already answered that... You add a client-side onclick event and capture the return value - if it's false, the postback won't happen... > or how do I intercept the OnSelectedIndexChanged event in JavaScript. Is > it called something else for the ListBox on the client side? An <asp:ListBox> webcontrol gets rendered as an HTML <select> - you need the onchange event... > Does the Client script event handler get executed then the server event > handler after the post? Yes, unless the client-side event returns false... SignatureMark Rae ASP.NET MVP http://www.markrae.net Mark, "onchange" is what I was looking for. Thanks for the help Lit. >> If I already have an onclick - server event, how do I Intercept before I >> post back? [quoted text clipped - 12 lines] > > Yes, unless the client-side event returns false... see RegisterOnSubmitStatement -- bruce (sqlwork.com) > Hi, > [quoted text clipped - 10 lines] > > Lit Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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