Develop Reference

Trigger validation after first submit, then after after every keystroke on input element

I am using jquery validation for everything I'm about to talk below.
so I have an input field, lets call it email. I also have a submit button for this form. Now by default the error message for email field will not kick in until I hit the submit button. Then whenever I type it will show/hide error message dependant on if it is a valid email. This check happens with every key stroke and this is a very important distinction to make so that you would understand my problem I posted below.
Now I have a background colour on the input, it is suppose to be green when validation has passed and red when it has failed. I have this part working, let me show you how I did it:
window.onload = function () {
$(".js-validate-circle").on("input", function () {
UpdateValidationCircle(this);
});
}
function UpdateValidationCircle(e) {
if ($(e).valid()) {
$(e).parent().addClass("active");
} else {
$(e).parent().removeClass("active");
}
}
The active class is what determines if its green or red. There is styling that is irrelevant I think to the question so I wont post it here.
Here is my problem: When the page loads and I start typing, it forces validation to trigger and error messages start coming in before I click the submit button for the first time. I am trying to prevent this. I want the color the start changing on typing only after the submit button was hit. Functionality of my red/green background should match jquery validation messages.
How would I accomplish something like this? I tried using on change but then the validation triggers only when the box loses focus.

jQuery(function($) { // DOM ready and $ alias in scope
// Cache elements
var $circle = $(".js-validate-circle");
var addedInputEvent = false; // Just a flag to know if we already added the evt listener
// On form submit....
$("#form").on("submit", function(event) {
// Prevent default form submit
event.preventDefault();
// Check immediately
$circle.each(UpdateValidationCircle);
// If not already assigned, assign an "input" listener
if(!addedInputEvent) {
addedInputEvent = true;
$circle.on("input", UpdateValidationCircle);
}
});
function UpdateValidationCircle() {
var $el = $(this);
$el.parent().toggleClass("active", $el.valid());
}
});

Use the keyup event instead:
$(".js-validate-circle").on("keyup", function () {
...
Assuming .js-validate-circle is your input... or if it is the form:
$(".js-validate-circle").on("keyup", "#id-of-the-input", function () {
...
If this doesn't work, we are going to need to see validate()s code and some markup.

Avoid multiple form submit in html

I'm facing a sort of dummy problem.
On my site there is an order form (simple html form) and I noticed that I get double commands from time to time.
I realized that if I clicked repeatedly few times the submit button (before the action page is loaded) I got as many commands as I have clicked.
So I wonder if there are simple solution to make form submission asyncronous?
Thanks
P.S. I added JQuery UI dialog on submit "wait please..." but I get still double commands.
UPDATE
As GeoffAtkins proposed I will:
disable submit after dialog is shown
make use of unique form's token (as it is already added by Symfony) Do not use Symfony token as unique form token as it is always the same for current session. Use just random or something like that.

I would consider doing this (jQuery since you said you used that)
$(function() {
$("#formId").on("submit",function() {
$("#submitBut").hide();
$("#pleaseWait").show();
});
});
if you submit the form and reload the page.
If you Ajax the order, then do
$(function() {
$("#formId").on("submit",function(e) {
e.preventDefault();
var $theForm = $(this);
$("#submitBut").hide();
$("#pleaseWait").show();
$.post($(this).attr("action"),$(this).serialize(),function() {
$theForm.reset();
$("#submitBut").show(); // assuming you want the user to order more stuff
$("#pleaseWait").hide();
});
});
});
NOTE that disabling the submit button on click of the submit button may stop the submission all together (at least in Chrome): https://jsfiddle.net/mplungjan/xc6uc46m/

Just disable the button on click, something like:
$("#my-button-id").on("click", function() {
$(this).attr("disabled", "disabled");
});

var bool = true;
function onclick()
{
if(bool)
{
//do stuff
bool = false;
}
else
{
//ignore
}
}

You could disable the button on the form when it is clicked, and then continue to perform the action. You would probably change the text to say "loading..." or some such.
You may also want to re-enable the button on fail or complete of the ajax request.
I've done this many times similar to this: https://stackoverflow.com/a/19220576/89211

Preventing users from accidentally navigating away from unsaved pages

I got the snippet below from this SO post, and it works when a user tries to reload the page or close the browser etc. but if the user clicks on a link then it lets them naivagate away, and then incorrectly starts displaying the message on the wrong page. I am using pjax for the links.
$(document).ready(function () {
$('textarea').change(function () {
window.onbeforeunload = function () { return "Your changes to the survey have not been saved?" };
});
});

You should use onbeforeunload like this, inconditionally:
<script type="text/javascript">
saved=true; // initially, it is saved (no action has been done)
window.onbeforeunload = confirmExit;
function confirmExit() {
if (!saved) {
return "You did not save, do you want to do it now?";
}
}
</script>
It is not safe to handle this event only when another event is fired. The onchange event of your textarea here probably don't fire before you click on a link so the window won't handle the onbeforeunload at all. The link will work as expected: you will get redirected.
To deal with the saved flag, you could listen to what happens in your textarea, for example, when the user is actually typing something:
$('textarea').keyup(function(){
saved=false;
});
Then, if you save the data in ajax, the save button could set it back to true:
$('#btnSave').click(function(){
// ajax save
saved=true;
});
Otherwise, it will load the next page with the saved flag on.

what about something like the following?
Listening on all <a> links and then, depending on whether the variable needToSave is set to true, showing the message or letting it go.
var needToSave = false; // Set this to true on some change
// listen on all <a ...> clicks
$(document).click("a", function(event){
if (needToSave == true) {
alert("You need to save first");
event.preventDefault();
return;
}
});
UPDATE (as per Roasted's suggestion) this should trigger the unload event every time the link is clicked and perform your existing logic:
// listen on all <a ...> clicks
$(document).click("a", function(event){
$(window).trigger("unload");
});
jsFiddle here - http://jsfiddle.net/k2fYM/

Alert for unsaved changes in form

I want to write Jquery code in master file, so that if there if user changes page and there is any unsaved changes user should get alert.
I got one answer from this: link
However in most solution I will have to write code on all pages. I want it to write only at one place so that everybody dont have to worry to write it in their modules. My code is like:
<script type="text/javascript">
var isChange;
$(document).ready(function () {
$("input[type='text']").change(function () {
isChange = true;
})
});
$(window).unload(function () {
if (isChange) {
alert('Handler for .unload() called.');
}
});
</script>
But everytime i make changes in text boxes .change() event is not firing.
What can be wrong in the code?
EDIT:
I changed .change() to .click and it is fired. i am using jquery 1.4.1..is it because of jquery version that change() is not working?

This is what i am using, Put all this code in a separate JS file and load it in your header file so you will not need to copy this again and again:
var unsaved = false;
$(":input").change(function(){ //triggers change in all input fields including text type
unsaved = true;
});
function unloadPage(){
if(unsaved){
return "You have unsaved changes on this page. Do you want to leave this page and discard your changes or stay on this page?";
}
}
window.onbeforeunload = unloadPage;
EDIT for $ not found:
This error can only be caused by one of three things:
Your JavaScript file is not being properly loaded into your page
You have a botched version of jQuery. This could happen because someone edited the core file, or a plugin may have overwritten the $
variable.
You have JavaScript running before the page is fully loaded, and as such, before jQuery is fully loaded.
Make sure all JS code is being placed in this:
$(document).ready(function () {
//place above code here
});
Edit for a Save/Send/Submit Button Exception
$('#save').click(function() {
unsaved = false;
});
Edit to work with dynamic inputs
// Another way to bind the event
$(window).bind('beforeunload', function() {
if(unsaved){
return "You have unsaved changes on this page. Do you want to leave this page and discard your changes or stay on this page?";
}
});
// Monitor dynamic inputs
$(document).on('change', ':input', function(){ //triggers change in all input fields including text type
unsaved = true;
});
Add the above code in your alert_unsaved_changes.js file.

A version that use serialization of the form :
Execute this code, when dom ready :
// Store form state at page load
var initial_form_state = $('#myform').serialize();
// Store form state after form submit
$('#myform').submit(function(){
initial_form_state = $('#myform').serialize();
});
// Check form changes before leaving the page and warn user if needed
$(window).bind('beforeunload', function(e) {
var form_state = $('#myform').serialize();
if(initial_form_state != form_state){
var message = "You have unsaved changes on this page. Do you want to leave this page and discard your changes or stay on this page?";
e.returnValue = message; // Cross-browser compatibility (src: MDN)
return message;
}
});
If the user change a field then manually rollback, no warn is displayed

change event is fired once the user blurs from input not on every single character inputed.
If you need it to be called every time something is changed (even if focus is still in that input field) you would have to rely on combination of keyup and bunch of events to keep track of pasting/cuting using mouse only.
P.S.
I hope you're aware that your approach to detecting changes isn't the best one? If user input some text, leaves the field and then reverts the changes the script would still alert him about modified text.

you should register events for not only inputs but also textareas, if you mean textarea with text box. You can use keyup for isChange, so that you don't wait for user to blur from this area.
$("input[type='text'], textarea").keyup(function () {
isChange = true;
})

This is really just a different version of #AlphaMale's answer but improved in a few ways:
# Message displayed to user. Depending on browser and if it is a turbolink,
# regular link or user-driven navigation this may or may not display.
msg = "This page is asking you to confirm that you want to leave - data you have entered may not be saved."
# Default state
unsaved = false
# Mark the page as having unsaved content
$(document).on 'change', 'form[method=post]:not([data-remote]) :input', -> unsaved = true
# A new page was loaded via Turbolinks, reset state
$(document).on 'page:change', -> setTimeout (-> unsaved = false), 10
# The user submitted the form (to save) so no need to ask them.
$(document).on 'submit', 'form[method=post]', ->
unsaved = false
return
# Confirm with user if they try to go elsewhere
$(window).bind 'beforeunload', -> return msg if unsaved
# If page about to change via Turbolinks also confirm with user
$(document).on 'page:before-change', (event) ->
event.preventDefault() if unsaved && !confirm msg
This is better in the following ways:
It is coffeescript which IMHO automatically makes it better. :)
It is entirely based on event bubbling so dynamic content is automatically handled (#AlphaMale's update also has this).
It only operates on POST forms as GET forms do not have data we typically want to avoid loosing (i.e. GET forms tend to be search boxes and filtering criteria).
It doesn't need to be bound to a specific button for carrying out the save. Anytime the form is submitted we assume that submission is saving.
It is Turbolinks compatible. If you don't need that just drop the two page: event bindings.
It is designed so that you can just include it with the rest of your JS and your entire site will be protected.

Why not simply bind the event to the change callback?
$(":input").change(function()
{
$(window).unbind('unload').bind('unload',function()
{
alert('unsaved changes on the page');
});
});
As an added bonus, you can use confirm and select the last element that triggered the change event:
$(":input").change(function()
{
$(window).unbind('unload').bind('unload',(function(elem)
{//elem holds reference to changed element
return function(e)
{//get the event object:
e = e || window.event;
if (confirm('unsaved changes on the page\nDo you wish to save them first?'))
{
elem.focus();//select element
return false;//in jQuery this stops the event from completeing
}
}
}($(this)));//passed elem here, I passed it as a jQ object, so elem.focus() works
//pass it as <this>, then you'll have to do $(elem).focus(); or write pure JS
});
If you have some save button, make sure that that unbinds the unload event, though:
$('#save').click(function()
{
$(window).unbind('unload');
//rest of your code here
});

Without jQuery:
var unsaved = false;
document.addEventListener("DOMContentLoaded", function() {
var els = document.querySelectorAll('textarea, input, select');
els.forEach( function(el) {
el.addEventListener('change', function() {
unsaved = true;
});
});
window.addEventListener('beforeunload', function(event) {
if(unsaved){
event.returnValue = "string";
}
});
var forms = document.querySelectorAll('form');
forms.forEach( function(form) {
form.addEventListener('submit', function() {
unsaved = false;
});
});
});
The weird 'string' hack explanation can be found here.

I use $('form').change etc. function to set a dirty bit variable. Not suitable to catch all changes (as per previous answers), but catches all that I'm interested in, in my app.

Problems with on submit and jquery

Working on a project where form changes are checked for. I'm having difficulty removing the changes have been made alert when the user submits the form.
$(document).ready(function(){
changes_made = false;
$('input, select, textarea').on('change', function() {
changes_made = true;
});
$(window).bind('beforeunload', function() {
if(changes_made) { return 'You have made changes on this page.'; }
});
$('form').each(function() {
$(this).on('submit', function() {
changes_made = false;
});
});
})

If you want to be able to revert any changes the user has made, you need to store the original contents of the form. That way, instead of waiting for change events, you can just compare the old form contents to the new contents, and replace if necessary.
Other tidbits: you need a var before your variable declaration (otherwise the variable ends up attached to the window object). And unless your form submit is an ajax call, there is no point in setting changes_made back to false. The page will reload and changes_made will be false again anyway.