I hava an ASP.NET Web Forms application.
My goal is to disable the submit button btnFinish upon user click, in order to avoid multiple submits.
<asp:Button ID="btnFinish" runat="server" Text="Finish" UseSubmitBehavior="false"
CausesValidation="true" CommandName="MoveComplete" CssClass="buttonStyle"/>
The Javascript function is:
function Validate(btnFinishId) {
btnObj = document.getElementById(btnFinishId)
if (Page_IsValid) {
btnObj.disabled = true
}
else {
alert('Page has some validation error');
}
// this is to prevent the actual submit
e.preventDefault();
return false;
};
btnFinish is placed within a FinishNavigationTemplate in a ASP.NET Wizard Control.
Therefore, in order to avoid runtime errors, I need to get the ClientID of the control programmatically and then add it to the OnClientClick event of the button:
Button btFinish = MyWizard.FindControl("FinishNavigationTemplateContainerID$btnFinish") as Button;
if (btFinish != null){
btFinish.Attributes.Add("onclientclick", "Validate('" + btFinish.ClientID + "');");
}
But it does not work. I use Firebug to check the page rendered by the browser but although the source code looks perfect, upon click the Javascript function is not executed.
If in the Javascript function I replace Validate(btnFinishId) with Validate() and instead of using the code behind to add the OnClientClick I write:
<asp:Button OnClientClick="Validate();" "ID="btnFinish" runat="server" Text="Finish" UseSubmitBehavior="false"
CausesValidation="true" CommandName="MoveComplete" CssClass="buttonStyle"/>
The function is executed but of course does not do what I want, because the button Id is missing. Anybody has a solution?
You're on the right track. Something like this should work:
<script type="text/javascript">
validate = function(btn){
//trigger client-side validation
var valid = Page_ClientValidate("");
//disable the button if the form is valid
btn.disabled = valid;
//trigger postback if the form is valid
//otherwise do nothing
return valid;
}
</script>
<asp:Button ID="btnFinish" runat="server" Text="Finish" OnClientClick="return validate(this);" OnClick="btnFinish_Click" ... />
It looks kind of backwards, but you could shorten the function like this:
<script type="text/javascript">
validate = function(btn){
btn.disabled = Page_ClientValidate("");
return btn.disabled;
}
</script>
One way is to create a normal HTML button on your page, add attach a click event with jQuery.
You can then hide the .net button using css.
In the click event for your html buttom, you can all the .net buttons click event.
$("#yourbutton").trigger("click");
Related
I have a form in ASP.NET with this button:
<asp:Button ID="btnNext"
runat="server"
CausesValidation="false"
Text="Submit Form" />
I do validation on this form with jQuery Validate, like so:
jQuery(function() {
jQuery('#form1').validate({
rules: {
txtSerialNumber: {
required: true
}
},
messages: {
txtSerialNumber: {
required: "Please enter a serial number."
}
}
});
});
There's more, but it's the same for all the fields. I have verified that this validation code works.
I also have some javascript to call the validation code, since it was not working before (for various reasons).
jQuery('#btnNext').on("click", function () {
if (jQuery("#form1").valid()) {
jQuery(this).prop('disabled', true); // prevent multiple submits
return true;
} else {
return false;
}
});
Edit: When I comment out the line that disables the button, the form gets submitted correctly. So it seems like disabling a submit button before the page posts back causes the page to not post back.
When I click on this button to submit the form, the javascript above gets called, but the page doesn't post back and submit. I've been pulling my hair out trying to get this figured out. Is there an obvious reason that it's not working correctly? What am I missing?
Add a OnClientClick event to the button, which is going to call the validation, instead of adding the .on("click") event handler with jquery.
<asp:Button ID="btnNext"
runat="server"
CausesValidation="false"
Text="Submit Form"
OnClientClick="validate()" />
javascript:
function validate () {
if (jQuery("#form1").valid()) {
jQuery(this).prop('disabled', true); // prevent multiple submits
return true;
} else {
return false;
}
});
I am working on an asp.net web forms project. I have an asp.net button which has both OnClientClick and onClick events. The OnClientClick event executes the javascript function processHolidayDates() which in turn shows a Telerik's Ok/Cancel message box. When the Ok button is clicked it will return true and if the Cancel button is clicked it will return false. So, when false is returned, I don't want the button click event to execute the server side code. However, the moment the message box is displayed already the code behind under the btnCreate_Click is executed. When I add "return false;" at the OnClientClick as in "OnClientClick="javascript:processHolidayDates(); return false " , the code behind is never executed even if I chose Ok in the message box. The following is my code on the aspx page
<asp:button id="btnCreate" runat="server" Text="Create" OnClientClick="javascript:processHolidayDates(); " onclick="btnCreate_Click"></asp:button>
function processStartAndEndDates() {
var oConfirm = radconfirm('Hello', callBackFn, 400, 300, null, 'Test');
return oConfirm ;
}
You could change your OnClientClick to
OnClientClick="return processHolidayDates();"
So that you will return false (and cancel the postback) if the user cancels the window.
This should work:
OnClientClick="return processHolidayDates();"
How to set the Onbeforeunload Function on the specific button?
Example, I have 3 buttons.
<div>
<asp:Button ID="btnBack" runat="server" Text="Back" CssClass="po-font" Height="30px"/>
<asp:Button ID="btnSumbit" runat="server" Text="Submit" CssClass="po-font" Height="30px"/>
<asp:Button ID="btnSaveToDraft" runat="server" Text="Save To Draft" CssClass="po-font" Height="30px"/>
</div>
On javascript, I did something like:
<script type="text/javascript">
window.onbeforeunload = confirmExit;
function confirmExit()
{
return "Are you sure you want to leave this page? Any unsaved progress will be lost";
}
</script>
The function will work properly though but I want to specify the function in an specific button probably on the "Back" button. I did something like.
<script type="text/javascript">
function confirmExit()
{
return "Are you sure you want to leave this page? Any unsaved progress will be lost";
}
$('#btnBack').live('click', function () {
window.onbeforeunload = confirmExit;
});
</script>
but Id doesn't work. How to do this? Any Ideas? I just want to trigger the function on the specified button. Help me.
Use $('<%=btnBack.ClientID%>').click(function(){...}); because asp.net prefix its own client with the control id and html rendered id may look like ct100$btnBack.
First off its unlikely that the ID is correct as ASP.NET prefixes the ID with the containers if that object. Either give btnBack a class and use that or:
$("[id$='btnBack']").on("click",...)
I'll edit with a battle tested version when I'm back in front of my pc
* Edit to add battle tested code *
So you need to bind the unload event to the window, you can't assign a function to it as Kevin says in his answer. If you only want it to fire for a specific button, the code below is something I use in active production (it has a few more checks, and checks if anything has been changed on a page before firing etc...), so should work for you:
if (self == top) { // Check we're not in an iFrame or colorbox
$(window).bind("beforeunload", function (event) { // bind the window unload event
if (backLinkClicked) { // Check if the back link has been clicked, if so prompt
return "Are you sure you want to leave this page? Any unsaved progress will be lost";
};
});
}
Then your click handler:
var backLinkClicked = false;
$("[id$='btnBack']").click(function() { backLinkClicked = true });
So you back button click handler just changes the variable to fire the prompt on unload.
First off, you should understand that onbeforeunload is an event, and by putting:
window.onbeforeunload = confirmExit;
you are attaching an event handler to window, which will be global.
If I am correct, what you want is bringing up a confirmation dialog when user tries to navigate away by clicking on a button. I suggest you try this:
$('#<%=btnBack.ClientID%>').on('click', function (e) {
// check if user clicked cancel
if (!confirm("Are you sure [...]") {
e.stopImmediatePropagation();
e.preventDefault();
return false;
}
});
With this, when user clicks the button, a confirmation dialog will appear (confirm()). If user clicks cancel, code will call stopImmediatePropagation() (which should prevent other JS event handler from running) and preventDefault() (which disable the default action when the button is clicked, e.g., submitting the form).
I haven't tested this out myself, but I guess it should work.
I have this java script validation function that fires when the client clicks btnsave
if the text of the text box is empty then a message box is displayed and the focus is on the
text box but i cannot seem to prevent the page from posting back when the validation fails
AM I missing something. here is my code
function validate()
{
var itemscanned;
itemscanned = document.getElementById('txtItemCode');
if (itemscanned.value == '')
{
alert("Plz Enter Item Code");
return false;
itemscanned.focus
}
else
{
alert(itemscanned.value);
}
}
Write return before function name like this
<asp:Button ID="btnSave" runat="server" Text="Save" CssClass="buttons" OnClientClick="return validate()"/>
If this is an ASP.NET WebForms application, you really should consider using the Validator controls. They handle all of client-side logic you are asking for.
If you are using MVC, there is also a way to do model validation on the client side.
add this if its asp.net button control
OnClientClick = "return validate();"
if it is html button add this
onclick = "return validate();"
Ît belongs how you handle the events. Please show the asp markup and the binding of the javascript event.
You can try to stop event propagation using javascript:
event.stopPropagation();
Read about it here: https://developer.mozilla.org/en-US/docs/DOM/event.stopPropagation
Note: you have to get the event as an parameter to the validate function:
function validate(event) {
var itemscanned;
itemscanned = document.getElementById('txtItemCode');
if (itemscanned.value == '') {
alert("Plz Enter Item Code");
event.stopPropagation();
itemscanned.focus
return false;
}
else
{
alert(itemscanned.value);
}
}
Hope this helps. It's very important how you bind the validate function the button, because asp.net generates a lot of javascript on its own (google for asp.net client validation).
I have an ASP:Button on a page. It renders as HTML like so:
<input type="submit" name="myButton" value="Do something"
onclick="javascript:WebForm_DoPostBackWithOptions(
new WebForm_PostBackOptions('myButton', '', true, '', '', false, false))"
id="myButton" />
Now I am trying to prevent the default behavior of this button (submitting the form) via a jQuery event handler:
$('#myButton').click(function () {
// do some client-side stuff
if (someCondition) {
// don't postback!
return false;
}
});
The problem here is that the inline click handler that ASP sticks on the input seems to be executing before the jQuery event handler, every time.
The easiest solution here would be to use a plain input type="button" instead of an ASP:Button, unfortunately this is not a possibilty as this ASP:Button does many other things that are required in this scenario.
What would be the best way to prevent the form submission from happening? I've thought of using string manipulation to prepend my handler on the element's onclick attribute, but this seems really dirty. I'd also like to avoid using the OnClientClick as this would require my handler function to be publicly exposed. Is there a better way?
Have you tried adding OnClientClick="return false;" attribute to your aspx button control?
No worries check out this post it provides a javascript event unloader script: Is it possible to remove all event handlers of a given element in javascript?
I think youre interested in the last method DomLib.prototype.removeEventsByTypeEx
I just found a way
<script type="text/javascript" src="Scripts/jquery-1.7.2.min.js"></script>
<script type="text/javascript">
$(function () {
var ploopButton = null;
$("#ploop").click(function (e) {
ploopButton = this;
});
$("#form1").submit(function (e) {
if (ploopButton !== null) {
ploopButton = null;
return confirm('are u sure?');
}
return true;
});
});
</script>
<form id="form1" runat="server">
<asp:Button ID="ploop" Text="ploop" runat="server" OnClick="ploop_Click" />
</form>
Basically you would use a global flag indicating which button was clicked, and you would confirm the form submit when the flag is turned on