I have an ASP button for which I have set the OnClientClick property to display a javascript confirm message. However, I only want this message to be displayed AFTER all of the client side validations have passed.
How can I do this? Essentially, I believe that I need to force Page level validation from the client and then, only if it passes, display the confirmation box.
If you're using the ASP.NET validation controls add an OnClientClick like this to your submit button...
<asp:Button ID="blah" OnClientClick="if(Page_ClientValidate())return confirm('your message')" OnClick="your submit method" Text="submit" runat="server" />
...Page_ClientValidate() will return true if the page is validated then you need to return the results of your "confirm" in order for the form to be submitted.
There's something along these lines available here: http://www.codeproject.com/KB/aspnet/JavascriptValidation.aspx
Related
My asp.net page has multiple text-boxes and DropDownLists that all have required-field validators.
My site also has multiple pages that you can move between with the click of a button. (All pages have all the buttons) When a page loads and decide I want to go to a different page without entering information into the form, I click a button to move to a separate page and the validation pops up and I can't change the page, it stops me every time?
Any ideas on how to stop this?
I know you already found a solution, but I just wanted to throw in another method for people to see.
When using validators it is common practice to use ValidationGroups. When a validator belongs to a ValidationGroup, it is only triggered by another control in the validation group. For example:
<asp:TextBox ID="NameBox" runat="server"/>
<asp:RequiredFieldValidator ID="NameVal" ControlToValidate="NameBox"
ValidationGroup="ValSubmit" runat="server"/>
//...More input fields and validators...
<asp:Button ID="SubmitButton" ValidationGroup="ValSubmit" runat="server"/>
Using this method any validators with the "ValSubmit" ValidationGroup will be triggered only by the SubmitButton and not by other controls. Now you don't have to put CausesValidation="false" on EVERYTHING else that causes a postback.
As everyone else had mentioned, set the CausesValidation property to false.
<asp:Button ID="MyButton" Text="Go Back" CausesValidation="False" />
This is straight from the Microsoft Help Page:
By default, page validation is performed when a Button control is clicked. Page validation determines whether the input controls associated with a validation control on the page all pass the validation rules specified by the validation control.
You can specify or determine whether validation is performed on both the client and the server when a Button control is clicked by using the CausesValidation property. To prevent validation from being performed, set the CausesValidation property to false.
Note:
You should set the CausesValidation property to false when you are using the PostBackUrl property to post back to a different page. You should explicitly check validation when posting back to a different page. For an example, see the Remarks section of the PostBackUrl property.
This property is commonly set to false for a reset or clear button to prevent validation from being performed when the button is clicked.
When the value of the CausesValidation property is set to true, you can also use the ValidationGroup property to specify the name of the validation group for which the Button control causes validation.
set property CausesValidation = "false" to the buttons where you don't want to trigger validation
CausesValidation="false" on the button ;)
<asp:Button CausesValidation="True|False" />
Gets or sets a value indicating whether validation is performed when the Button control is clicked.
read more about Button.CausesValidation Property
I have an ASP.NET form with a few controls and a submit button at the bottom, all inside an update panel:
<asp:UpdatePanel runat="server" ID="upContent">
<ContentTemplate>
<asp:TextBox runat="server" ID="tbxMyTextBox" AutoPostBack="true" />
<asp:Button ID="btnSubmit" runat="server" Text="Submit" OnClientClick="return doStuff()" OnClick="btnSubmit_Click" />
</ContentTemplate>
</asp:UpdatePanel>
If I write something in the TextBox and click 'submit' immediately (without clicking out of the TextBox first), the changes are not recorded (as seen in the server-side event handler). However, if I write something in the TextBox, and then change focus to another control, an AutoPostback happens through the UpdatePanel and then clicking 'submit' does recognize these changes. How can I force this content to update right as I click the submit button, while still running both the clientside and serverside events attached to it? Thanks!
Is is possible that your text-box gets cleared due to some on-submit/on-click event handler? I will suggest you do use some tool such as Fiddler to inspect the POST data in request. Or you can put a break-point at your server side code and inspect the request data. Look for particularly Request.Form[tbxMyTextBox.UniqueID] - i.e. look for presence of value for your text-box's name (name property at client side which corresponds to UniqueID property at server side). If the request contains the value typed in the text-box then something is happening on server side but good news is you can always retrieve the value from Request object. If the value is not present in the Request object then it means that client side code is clearing the value before the submit.
If an onclick method returns false, it cancels the action that the button would normally perform. As your button would normally submit your form, but it appears not to be submitting, your client side javascript code in doStuff is probably returning false.
I have some validation JS code on client, that must be executed befor PostBack.
If this validation code return 'false', postback is needless.
How it can be disabled?
Remember that the real validation should always happen on the server. Anything you do client-side is merely an optimization to save a few http round trips.
The easiest way to keep your client side and server-side validation in sync with ASP.Net is to use the validation controls. The validation controls will do both client side and server side validation, in such a way that if validation fails on the client it never posts to the server.
If you want to do something that's not covered by the standard validation controls, you should either use a CustomValidator or inherit your own control from BaseValidator.
Set the OnClientClick='YourJSValidationFunction' on your ASP button.
Then have the YourJSValidationFunction return true or false.
False will prevent postback
Example:
http://vijaymodi.wordpress.com/2007/06/08/button-onclick-and-onclientclick-2/
If the postback is being triggered by a button then you can do something like this:
<asp:Button ID="Button1" runat="server" Text="Button" OnClientClick="return IsValid();" />
If the IsValid function returns false then the postback will be prevented.
If you want to catch all postbacks regardless of which control triggers it then you can use <form id="form1" runat="server" onsubmit="return IsValid();">
What do you use: some validator or some button with onclick event?
If you have
<input type="button" id="btnID" runat="server" onclick="CheckValid();"/>
function CheckValid()
{
if(!IsValid) return false;//then no post back occer
}
Depending on the validation you're attempting, you may also be able to use the CustomValidator control. This would also allow you to easily implement your validation logic on the server side.
I have a regularexpression validator which validates a valid email. I have two buttons on my form. Submit and undo.
On undo, we are reverting the page state to default
submit has it validationgroup set while undo doesnot have any validationgroup and CausesValidation="false".
Now when i navigate to page and enter invalid emailaddress,i directly click undo. the validator fires and stops my page from posting.however if i press tab and navigate to other control and then click undo,the validator shows error message but posts back and furthur proessing is done.
This is very strange and i want the page to postback without any error message when i click undo.how to achieve it.
<tec:ThemedImageButton runat="server" ID="imgbtnSave" OnClick="imgbtnSave_Click"
ValidationGroup="CustomerGroup"/>
<tec:ThemedImageButton runat="server" ID="imgbtnCancel" CausesValidation="false"
OnClick="imgbtnCancel_Click" />
These are normal image buttons with added themes.CustomerGroup is the validation group for my textbox and regularexpressionvalidator
Are you possibly clicking the undo whilst your focus is still within the email textbox? If so, perhaps the issue is that the initial blur event of the textbox is firing which in turn is calling the email validator and preventing the click / submission.
The first thing to try is to make sure you can enter an invalid email address, move the focus onto a completely different area of the page and then press undo to determine if this is the cause.
Double check your settings.
You might want to check the code behind to make sure you are not overwriting the control settings there. For example, in code, you might have the CausesValidation set to "True" or something like that.
Until you post more information you could do the following in your Undo button:
<asp:Button ID="btnUndo" runat="server" Text="Undo"
OnClientClick="Page_ValidationActive = false;"
OnClick="btnUndo_Click" />
I don't recommend this as it might solve your problem but really doesn't explain what is wired up incorrectly but the Page_ValidationActive = false; will disable all client validation on your page.
I am using a require field validator for a textbox in asp.net application. Problem is that when there is no value in textbox then no button on the web page do not works even page redirection button for back page also not performing function and validator gives err msg which i define
But if I put sum value in it then all btn works correctly.
Can anyone tell me that how can i overcome this problem
Set the CausesValidation attribute to False on the button and link controls that don't require validation (such as your back button).
<asp:button id="btnBack" runat="server" causesvalidation="false"></asp:button>