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Click is being invoked before focusOut event in js

I have input element which will take input and filter the contents and the filter event will be trigger once the user gets focused out from the input element.
When the user having the focus in the input element and he clicks in one of the button, the click event is invoked first and then the focus out event, as it creates conflicts while generating the filtered content.
I tried changing the order of code and other options such as changing the way of invocation of the click event - none of the ways worked out for me
$('body').on('focusout', '.classname', functionname);
function functionname(e) {
if (typeof e == 'object') {
}
}
$('body').on('click', '.buttonclass', function (e) {});
Could someone help me to build The FocusOut event to trigger first and then the click event.

Based on the current conditions, you have to - inside the click handler - retrieve the validation result, and based on that result, decide if button submission should or should not occur.
JS Code:
$("#input").focusout(function(){
var that = this;
valid = this.value.length ? true : false;
!valid && window.setTimeout(function() {
$(that).focus();
}, 0);
});
$("#button").click(function(e) {
if ( !valid ) { return false; }
e.preventDefault();
alert('execute your filter)');
});

off() not working in firefox but working in chrome

I am using a beforeonload function but I want when the user submits the form beforeunload shouldn't work. Here is my code, which works fine in Chrome but not in Firefox.
window.form_submitted = '';
jQuery(document).ready(function() {
jQuery(window).on('beforeunload', function() {
if (form_submitted == '') {
return "Are you sure to leave that page";
}
});
});
jQuery('#form').on('submit', function (e) {
e.preventDefault();
jQuery(window).off('beforeunload');
form_submitted = 1;
site_redirect(resp.payment_url);
}
return false;
});

You have several syntax issues, and you have to place the submit block inside the DOMReady handler, otherwise JS will attempt to bind the event to an element which doesn't yet exist in the DOM. Also note you can remove the the global flag variable as you are unbinding the beforeunload event on form submission. Try this:
jQuery(document).ready(function($) {
$(window).on('beforeunload', function() {
return "Are you sure to leave that page";
});
$('#form').on('submit', function (e) {
e.preventDefault();
$(window).off('beforeunload');
site_redirect(resp.payment_url);
});
});
Also note that by doing a redirect when the form is submit (assuming that's what the site_redirect function is doing) then the content of the form will be lost.

How to trigger an event when the user clears the text field and focus out of the text field using Jquery?

I need to write an event handler when user clears the text field and moves out of focus from the same.
I'm using the following function to catch "focus out" event.
$("input[type=text]").blur(function () {
}
I have the followingfunction to capture clear field event.
$("input[type=text]").keyup(function() {
if (!this.value) {
}
}
I tried using the keyup() function inside blur() since I need to capture the focus out and then clear field. This is how my code looks like:
$("input[type=text]").blur(function () {
$(this).keyup(function() {
if (!this.value) {
}
}
}
But it doesn't work. Clear field event is triggered even before focus is out of the field. Also, it is triggering the event multiple times. What is the problem here?

I think that is more simple:
$('input').on('blur', function(e) {
if(!$(this).val()) {
// IS NO VALUE IN THE INPUT
$(this).trigger('blur'); // trigger the blur event
}
});

Here you are:
$("input[type=text]").on('blur', function() {
alert('blur');
});
$("input[type=text]").on('input', function() {
if (!$(this).val()) {
alert("input nothing");
}
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="text" />
Hope this helps.

jQuery disabling login submit button if username field is empty

I am trying to disable the submit button if the username textbox field is empty.
$("#txtUserName").bind("input propertychange change keyup paste", setButtonState);
var setButtonState = function () {
if ($("#txtUserName").val().trim() == "") {
$("#login").attr("disabled", true);
}
else {
$("#login").removeAttr("disabled");
}
}
The above code is working fine in all scenarios except that,when the user selects username which is saved earlier(autocomplete).
I cannot set the autocomplete off option for the textbox.
How can I catch the event when user selects text in autocomplete usernames?

Just bind your input field to the additional event select, which is fired when a user selects something from his autocompletion.
This would be your code then. I just added select and rearranged your code a little bit. Also I run setButtonState() once at the domready to be sure it's disabled.
var setButtonState = function () {
if ($("#txtUserName").val().trim() == "") {
$("#login").attr("disabled", true);
}
else {
$("#login").removeAttr("disabled");
}
}
$("#txtUserName").bind("input propertychange change keyup paste select", setButtonState);
setButtonState();
I have also updated the jsfiddle to demonstrate it.

Prevent click after focus event

When user clicks on input field, two consecutive events are being executed: focus and click.
focus always gets executed first and shows the notice. But click which runs immediately after focus hides the notice. I only have this problem when input field is not focused and both events get executed consecutively.
I'm looking for the clean solution which can help me to implement such functionality (without any timeouts or weird hacks).
HTML:
<label for="example">Example input: </label>
<input type="text" id="example" name="example" />
<p id="notice" class="hide">This text could show when focus, hide when blur and toggle show/hide when click.</p>
JavaScript:
$('#example').on('focus', _onFocus)
.on('blur', _onBlur)
.on('click', _onClick);
function _onFocus(e) {
console.log('focus');
e.preventDefault();
e.stopPropagation();
e.stopImmediatePropagation();
$('#notice').removeClass('hide');
}
function _onClick(e) {
console.log('click');
$('#notice').toggleClass('hide');
}
function _onBlur(e) {
console.log('blur');
$('#notice').addClass('hide');
}
UPDATED Fiddle is here:

I think you jumbled up the toggles. No need to prevent propagation and all that. Just check if the notice is already visible when click fires.
Demo: http://jsfiddle.net/3Bev4/13/
Code:
var $notice = $('#notice'); // cache the notice
function _onFocus(e) {
console.log('focus');
$notice.removeClass('hide'); // on focus show it
}
function _onClick(e) {
console.log('click');
if ($notice.is('hidden')) { // on click check if already visible
$notice.removeClass('hide'); // if not then show it
}
}
function _onBlur(e) {
console.log('blur');
$notice.addClass('hide'); // on blur hide it
}
Hope that helps.
Update: based on OP's clarification on click toggling:
Just cache the focus event in a state variable and then based on the state either show the notice or toggle the class.
Demo 2: http://jsfiddle.net/3Bev4/19/
Updated code:
var $notice = $('#notice'), isfocus = false;
function _onFocus(e) {
isFocus = true; // cache the state of focus
$notice.removeClass('hide');
}
function _onClick(e) {
if (isFocus) { // if focus was fired, show/hide based on visibility
if ($notice.is('hidden')) { $notice.removeClass('hide'); }
isFocus = false; // reset the cached state for future
} else {
$notice.toggleClass('hide'); // toggle if there is only click while focussed
}
}
Update 2: based on OP's observation on first click after tab focus:
On second thought, can you just bind the mousedown or mouseup instead of click? That will not fire the focus.
Demo 3: http://jsfiddle.net/3Bev4/24/
Updated code:
$('#example').on('focus', _onFocus)
.on('blur', _onBlur)
.on('mousedown', _onClick);
var $notice = $('#notice');
function _onFocus(e) { $notice.removeClass('hide'); }
function _onClick(e) { $notice.toggleClass('hide'); }
function _onBlur(e) { $notice.addClass('hide'); }
Does that work for you?

Setting a variable for "focus" seems to do the trick : http://jsfiddle.net/3Bev4/9/
Javascript:
$('#example').on('focus', _onFocus)
.on('click', _onClick)
.on('blur', _onBlur);
focus = false;
function _onFocus(e) {
console.log('focus');
$('#notice').removeClass('hide');
e.preventDefault();
e.stopPropagation();
e.stopImmediatePropagation();
focus = true;
}
function _onClick(e) {
console.log('click');
if (!focus) {
$('#notice').toggleClass('hide');
} else {
focus = false;
}
}
function _onBlur(e) {
console.log('blur');
$('#notice').addClass('hide');
}

If you want to hide the notice onBlur, surely it needs to be:
function _onBlur(e) {
console.log('blur');
$('#notice').addClass('hide'); // Add the hidden class, not remove it
}
When doing this in the fiddle, it seemed to fix it.

The code you have written is correct, except that you have to replae $('#notice').removeClass('hide'); with $('#notice').addClass('hide');
Because onBlur you want to hide so add hide class, instead you are removing the "hide" calss.
I hope this is what the mistake you have done.
Correct if I am wrong, Because I don't know JQuery much, I just know JavaScript.

you can use many jQuery methods rather than add or move class:
Update: add a params to deal with the click function
http://jsfiddle.net/3Bev4/23/
var showNotice = false;
$('#example').focus(function(){
$('#notice').show();
showNotice = true;
}).click(function(){
if(showNotice){
$('#notice').show();
showNotice = false;
}else{
showNotice = true;
$('#notice').hide();
}
}).blur(function(){
$('#notice').hide();
});