I have an asp.net image button and I want to cancel the click event incase he fails the client side validation... how do I do that?
There is an OnClientClick event you can set this to your javascript function. If you return true it will continue to the post back. If you return false the post back will not happen.
<asp:Button ID="NavigateAway" runat="server" OnClientClick="javascript:return PromptToNavigateOff();" OnClick="NavigateAwayButton_Click" Text="Go Away" />
<script type="text/javascript">
function PromptToNavigateOff()
{
return confirm("Are you sure you want to continue and loose all your changes?");
}
</script>
<asp:ImageButton OnClientClick="return ValidatorOnSubmit()" />
The ValidatorOnSubmit() function should already be included by the ASP.NET framework if you have validators on your form. The standard WebForm onsubmit function looks like this:
function WebForm_OnSubmit() {
if ( typeof(ValidatorOnSubmit) == "function"
&& ValidatorOnSubmit() == false) return false;
return true;
}
I would simply reverse logic and not allow the user to click the button until he has filled the information. Put mandatory markers and if it is filled it then the button is enabled.
Related
How do I ask for a confirmation when an event fire, only under certains conditions ? I'm working on the server side and I want to ask for a confirmation only if my boolean is true.
How to add a "confirm delete" option in ASP.Net Gridview?
Ok lets say you do have a grid with a button inside template column
<asp:Button ID="btnSave" runat="server" Text="Save" OnClientClick="return check();" />
and write in your check function determine if button should raise a postback?
<script type="text/javascript">
function check() {
var doINeedToAskUserConfirmation = // Get this according to your needs
if ( doINeedToAskUserConfirmation ){
return confirm("Are you sure?");
}
return true;
}
</script>
lets say you have a button
<input type="button" id="btnConfirm" value="Proceed"/>
Make an ajax call to determine if you need any confirmation.
$("#btnConfirm").click(function(){
$.ajax({
type: "POST",
url: "some.ashx",
data: { name: "John", location: "Boston" }
}).done(function( response ) {
// lets say when response is true we will ask confirmation
if ( msg )
{
var c = confirm( "All record will be deleted. Are you sure ? ");
// Do another ajax call to complete your operation
}
});
});
Depending on what kind of you events you are using, you could create a class that derives from EventArgs and place your condition as a property (and call it MyCondition for instance) in your own class.
In the eventhandling method, you can then use
if(e.MyCondition)
{
// do something
}
Edit:
Based on you comments, I'd suggest you try to use a DetailsView for Editing, or use the GridViews Editmode if you like.
You may also take a look at the CustomValidator.
I'm trying to get a sequence of things to happen in the correct order, but no luck. What I have is a number of fields with asp:ReuiredFieldValidators and asp:ValidatorCallout to display validation messages. This is triggered with a button Save with validation="true".
If all validates, it should display a modal dialog asking for two choises on how to save the data. No matter the answer, it should always continue at this stage to code behind save function.The AjaxToolkit_ModalPopupExtender is connected to the same save button.
What happens is that the validation callouts and modal dialog is shown at the same time.
Searched for tips and help but haven't found any, for me, helpful! Most grateful for any help!
Cheers
/Johan
You can show the ModalPopup from codebehind(in BtnSave.Click-handler) if the page is valid:
Page.Validate("YourValidationGroup");
If(Page.IsValid){
ModalPopup1.Show();
}
Therefor you need to set the TargetControlID of the ModalPopupExtender to a hidden button:
<asp:Button ID="Hid_ShowDialog" Style="display: none" runat="server" />
You must move to Code Behind only when the Page is validated in client side. You can do it using OnClientClick of button
<asp:Button ID="ShowDialog" onClientClick = "return ValidatePage();"
runat="server" />
<script type="text/javascript">
function ValidatePage() {
if (typeof (Page_ClientValidate) == 'function') {
Page_ClientValidate();
}
if (Page_IsValid) {
// do something
alert('Page is valid!');
return true;
}
else {
// do something else
alert('Page is not valid!');
return false;
}
}
</script>
I have an asp:button with an onclick property that posts back to the server. I would like to do some validation on the contents of a textbox before I fire the postback. I want to do the validation in javascript using some regex.
I cannot use an asp:XXXXvalidator; I just can't due to what my web app does.
Is there a way to call a javascript function from an asp:button that then calls the postback?
I know I can use OnClientClick to call js from the asp:button, but once I call the JS how do I signal that I want to postback the button?
Create a javascript function which returns true/false on your check. If you return false, then the page will not be submitted to the server.
Pseudo-code:
<script type="text/javascript">
function check()
{
if( valid ) return true;
return false;
}
</script>
<asp:Button ID="btnAdd" runat="server" OnClientClick="return check()" OnClick="click" />
i am using validators for validation and on linkbutton i am diaplaying popup.
my problem is i want to disable linkbutton means until page is validated means the popup should not be displayed till the page gets validated
<asp:LinkButton ID="LinkButton1" runat="server" CssClass="addProduct-disable" Enabled ="false"
Text="Assign Filter Criteria" CausesValidation="true"></asp:LinkButton>
Try to validate client-side, if possible, via AJAX-Methods.
You may consider using the jQuery event.preventDefault() method.
$('[id$="LinkButton1"]').click(function(event) {
if(! valdiateYourPage() ) {
event.preventDefault();
// display validation errors or something
}
else {
//proceed as normal
}
});
Put your page validation logic in the valdiateYourPage() javascript method. If it valdiates, then process as normal, if not then preventDefault() will stop any further event execution by your LinkButton.
I have a page whose submit buttton does dot submit at all. It rathers has a some javascript in OnClientClick that employs some logic and redirects the user to a calculated URL. The thing is I want to use ASP.net default validation in this setup. I need to be able to query the state of the client side validation in the javascript. How do I do that?
This appears to be what your looking for, using ASP.NET Validation from client code
<asp:Button ID="btnAddEntry" runat="server" OnClientClick="ValidateAndAddNewEntry(); return false;" CausesValidation="true" ValidationGroup="AddEntry" Text="Create" />
JavaScript
function ValidateAndAddNewEntry() {
var res = Page_ClientValidate("AddEntry");
if ( res == true )
{
//Do work
}
}