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.NET Forum / ASP.NET / General / February 2008Validation Controls not stopping Form Post
Hi all, I was under the impression that the Validation Server Controls actually perform validation on the Client and don't allow a form to Post if any of the validations fail. Please correct me if I am wrong about that. If that is the case then I will probably have to write my own validators in JavaScript (which I thought that ASP.NET 2.0 would help me to avoid). I have a form for filling out Email information which contains validation controls. In fact I have 2 forms like that with the same validator controls pointing to the same input fields. They just operate slightly differently upon post. One of them seems to work properly and the other one doesn't and I cant seem to figure out why. The Form1 that works (validates) properly is posted by the button as below: <asp:Button runat="server" ID="btnSubmit" Text="Preview" PostBackUrl="~/Common/EmailList.aspx" ToolTip="Preview Email" /> This Form1 cross posts to another page which shows a preview of the HTML to be sent in the email and then sends it when the user clicks a "Send" button. The Form2 that doesn't work (such that it allows the email to be sent without a subject or email addresses) is posted by the button control below: <asp:Button runat="server" ID="btnSend" Text="Send" OnClientClick="return SendMail();" OnClick="SendIt" CausesValidation="true" ></asp:Button> OnClientClick calls a Javascript function that assembles the Body content (actually HTML) and places it a hidden field before the form is posted. That part works fine and the HTML email sends OK. But, the Validation controls don't seem to work. Form2 posts back to itself, where it then runs the "SendIt" method that actually sends the email. The other difference is the OnClientClick javascript that is called. This is the form where validation does not operate properly, meaning the OnClick="SendIt" method is fired even if the form fields do not pass the validation tests. Can anyone tell me why the Validation appears to work in one case and not the other? I have triple checked that all validators are associated with the correct controls. In fact Form2 was built by copying much of the code from Form1. Thanks for any responses. It's responsobillity of the code to check if page is valid befor doing any action.... So your Button_OnClick code should have folowing code as first lines.... if( !this.IsValid) return; ........ George > Hi all, > [quoted text clipped - 47 lines] > > Thanks for any responses. George, Thanks for reminding me of the importance of checking the validity of the submitted form at the Server, should the user bypass any JavaScript or otherwise client-side validation. I have implemented your suggestion. It did solve the problem of the Email being sent with invalid information, but it required a PostBack and a complete form life-cycle, including another trip to the database to gather (again) necessary display elements. See my response to Mark Rae for the final solution, which I hope will help others who might run across a similar situation. Thanks again... John > It's responsobillity of the code to check if page is valid befor doing any > action.... [quoted text clipped - 58 lines] >> >> Thanks for any responses. > I was under the impression that the Validation Server Controls actually > perform validation on the Client and don't allow a form to Post if any of > the validations fail. Please correct me if I am wrong about that. http://msdn2.microsoft.com/en-us/library/yb52a4x0.aspx > I will probably have to write my own validators in JavaScript (which I > thought that ASP.NET 2.0 would help me to avoid). FWIW, I never ever use the Validation controls... I have a whole suite of client-side JavaScript validation routines which I find give me much more control over the entire client-side validation process...  SignatureMark Rae ASP.NET MVP http://www.markrae.net Many thanks Mark, The link to the explanation of the client-side workings of the Validation Server controls finally led me to a solution. I had placed a "filter" on the help searches in MSDN for VS2005 so it only returned articles for "Web Development". Apparently, whoever decides what the filters do made it difficult for me to find the article you pointed me to. From now on I leave the Help "unfiltered". Anyway, it was my OnClientClick="return SendMail();" that turned out ot be the culprit. It was being called right before the Microsoft generated DoPostBackWithOptions client-side call, which of course runs the client-side validation routines. The form was being submitted without client-side validation, thus underscoring the need for Server-side form validation at all times. I moved the call to my function "SendMail();" from the Button OnClientClick event to the Form onSubmit event so that it gets called only if client-side validation is successful. FWIW -- I am now well on my way to completing my own JavaScript validation library, thanks to a handy tool I downloaded -- RegexBuddy -- to help me with Regular Expressions. I highly recommend the tool for only about $40. Thanks again >> I was under the impression that the Validation Server Controls actually >> perform validation on the Client and don't allow a form to Post if any of [quoted text clipped - 10 lines] > find give me much more control over the entire client-side validation > process... > FWIW -- I am now well on my way to completing my own JavaScript validation > library Glad to hear it! Once you have it the way you like it, you'll never use client-side Validation Controls again... SignatureMark Rae ASP.NET MVP http://www.markrae.net > Hi all, > [quoted text clipped - 47 lines] > > Thanks for any responses. It sounds like you only want "SendMail()" to run if the page is valid. Try this link: http://forums.asp.net/p/1011848/1354154.aspx Scott, Thanks for your suggestion. I implemented it in a slightly different manner. Instead of what I had origianlly done: OnClientClick="return SendMail();" I placed that call in the form onSubmit event instead, so that I could still gather up the on-screen InnerHtml right before the post. See my response to Mark Rae for more info on how I solved the problem. Essentially, though, by making the call to my JavaScript function and returning "true" I was client-hijacking the Microsoft generated DoPostbackWithOptions call that followed my Javascript as the 2nd command in the HTML onClick event...such that the form was submitted without client-side Validation ever being run. >> Hi all, >> [quoted text clipped - 52 lines] > > http://forums.asp.net/p/1011848/1354154.aspx 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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