I have several functions running on a postback that can take a little time to complete.
When postback is initiated I show a loading image with this code:
function showLoader()
{
document.getElementById("<%=loadingImage.ClientID%>").style.visibility="visible";
}
I want to be able to add code to this function so if user tries to leave at this point they are informed the operation is not complete.
I found this code:
function goodbye(e) {
if(!e) e = window.event;
//e.cancelBubble is supported by IE - this will kill the bubbling process.
e.cancelBubble = true;
e.returnValue = 'You sure you want to leave?'; //This is displayed on the dialog
//e.stopPropagation works in Firefox.
if (e.stopPropagation) {
e.stopPropagation();
e.preventDefault();
}
}
window.onbeforeunload=goodbye;
This works but I only want the code to be active when the loading image is active.
I tried the following but it shows the alert message when the page eventually posts back:
function goodbye(e) {
if(!e) e = window.event;
//e.cancelBubble is supported by IE - this will kill the bubbling process.
e.cancelBubble = true;
e.returnValue = 'You sure you want to leave?'; //This is displayed on the dialog
//e.stopPropagation works in Firefox.
if (e.stopPropagation) {
e.stopPropagation();
e.preventDefault();
}
}
function showLoader()
{
document.getElementById("<%=loadingImage.ClientID%>").style.visibility="visible";
window.onbeforeunload=goodbye;
}
Any ideas how I can tweak this to just show when user leaves page and not when postback completes?
You need to set window.onbeforeunload to null when a form get submitted. So, basically:
<form onsubmit="window.onbeforeunload=null">
To apply this on all forms dynamically, I'd suggest to write a window.onload function for this which does this without the need to edit every single form on all your pages.
Related
window.onbeforeunload event is not working for the first time, when we
reload the url no alert coming while closing the browser tab.
But it works when we touch any element on the page and close the tab.
$(document).ready(function(){
window.onbeforeunload = function (event) {
var message = 'Important: Please click on \'Save\' button to leave this page.';
if (typeof event == 'undefined') {
event = window.event;
}
if (event) {
event.returnValue = message;
}
return message;
};
$(function () {
$("a").click(function () {
window.onbeforeunload = null;
});
});
});
Sample Code here : https://jsfiddle.net/oe9L0fdb/
This is expected behavior on certain browsers. As described here:
To combat unwanted pop-ups, some browsers don't display prompts created in beforeunload event handlers unless the page has been interacted with. Moreover, some don't display them at all.
Essentially this is to prevent abuse by web pages.
How do I restrict my user from closing the tabs or browser while accessing any specific page.
window.onbeforeunload = function(e) {
if (!e) e = window.event;
e.cancelBubble = true;
e.returnValue = 'You sure you want to leave?';
if (e.stopPropagation) {
e.stopPropagation();
e.preventDefault();
}
return 'You sure you want to leave?';
return false;
}
I tried above code but it gives popup for leave the page or stay on the page on chrome browser.
You can't.
The browser is software that belongs to the user. It is completely under their control. If they want to quit, they can quit.
You need to design your system so it is robust enough to handle people quitting part way through.
I'm using the following function to prevent double submissions:
$("#form").submit(function () {
var form = $(this);
form.find("input[type=submit]").attr("disabled", "disabled")
form.find("input[type=submit]").attr("value", "Processing");
});
It works fine, but then I have the following code which triggers an alert to avoid accidentally leaving the page:
function goodbye(e) {
if(!e) e = window.event;
//e.cancelBubble is supported by IE - this will kill the bubbling process.
e.cancelBubble = true;
e.returnValue = '¿DO YOU REALLY WANT TO LEAVE THIS PAGE?'; //This is displayed on the dialog
//e.stopPropagation works in Firefox.
if (e.stopPropagation) {
e.stopPropagation();
e.preventDefault();
}
}
window.onbeforeunload=goodbye;
The problem is if the user clicks submit and the realizes he didnt want to leave the page and clicks on stay on this page instead, the submit button is still disabled.
How could I re-enable it upon clicking stay on this page?
Thanks!
The button problem
You want to disable and enable the submit button so you know you going to touch the same kind of function and object twice, it is better to make advantage out of this in a function
function disableSubmit(form, enabled){
var submit = form.find("input[type=submit]"),
dataVar = enabled !== true ? "processing-message" : "send-message",
message = submit.data(dataVar);
submit.prop('disabled', (enabled !== true) );
submit.val(message);
}
I could make it even more generic for using it on each form. But the message in the button will display whatever you put in the data-attribute.
Cancel Submit
There is a problem with cancellation of an onbeforeunload event; there is no callback for it. The solution I came with is using a timeout. Since you don't know if the person canceled or not, I think 2 seconds is enough for the page to submit.
You have to have 2 seconds patient to get the submit button enabled again. But you can adjust it all you want of course
if (e.stopPropagation) {
setTimeout(function () {
disableSubmit(formObject, true);
}, 2000);
e.stopPropagation();
e.preventDefault();
}
The JSFiddle example
On the cart page of my website, I have to intercept the user leaving the page and ask them if they want to save their cart via email.
I guess I have to use the event "beforeunload" to intercept the user leaving the page, but then I have two problems:
How to exclude from the "beforeunload" trigger the click on the link to proceed with the payment?
How to prompt a small form where I can ask for his email (to be used somehow later) and then proceed with the unload of the page?
For excluding on the link to proceed with the payment, you can do this :-
window.onbeforeunload = function() {
return "You're leaving the site.";
};
$(document).ready(function() {
$('a[rel!=ext]').click(function() { window.onbeforeunload = null; });
$('form').submit(function() { window.onbeforeunload = null; });
});
The only thing u can do is making a default browser messagebox appears...
window.onbeforeunload = foo;
function foo(e) {
if (!e) e = window.event;
//e.cancelBubble is supported by IE - this will kill the bubbling process.
e.cancelBubble = true;
e.returnValue = 'You sure you want to leave?'; //This is displayed on the dialog
//e.stopPropagation works in Firefox.
if (e.stopPropagation) {
e.stopPropagation();
e.preventDefault();
}
}
There is a lot of questions on stackoverflow.com about this issue. But there is really no answer, or I couldn't find it (in that case, I am sorry for this duplicate).
So I have an Ajax based web application, and I want to know if user want's to leave the page. Here's a snippet what I have:
function goodbye(e) {
if(!stopGoodbye) {
if(!e) e = window.event;
e.cancelBubble = true;
e.returnValue = 'You are leaving the system!';
if (e.stopPropagation) {
e.stopPropagation();
e.preventDefault();
}
}
}
window.onbeforeunload=goodbye
stopgoodbye is for turning off when clicking logout.
This works in Firefox, but in IE9 it is showing the dialog everytime user clicks a link which just changes some DIV content (an Ajax link)... If it helps, I am using Struts2 framework with jQuery.
you can actually turn the onbeforeupload warning off for the user(when they clicked on a link) by adding an onclick event to the anchor.
you can read more about here, the solution are in the comments