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document.getelementById("").value does not work in case of Ajax call?

I want to do search and it can search many times. when it is submitted, it will show value in textbox by using document.getelementById("").value. All work well but I added ajax for filter search, document.getelementById("").value couldn't work.
$(document).ready(function() {
$('#job_no').change(function() {
$.ajax({
type: 'POST',
data: {JOB_NO: $(this).val()},
url: 'select.php',
success: function(data) {
$('#input_na').html(data);
}
});
return false;
});
});
<script type="text/javascript">document.getElementById('input_na').value = "<?php echo $_POST['input_na'];?>";</script>

Try this:
$(document).ready(function() {
$('#job_no').change(function() {
var $this = $(this); //add this line
$.ajax({
type: 'POST',
data: {JOB_NO: $this.val()}, //change this line
url: 'select.php',
success: function(data) {
$('#input_na').html(data);
}
});
return false;
});
});
the 'this' in $.ajax(..) function will not refer to $('#job_no'), so it should be assigned to another variable "$this" for use inside the ajax function.

toggleClass in Ajax request not working

I am having a little trouble getting my .toggleClass to work. I am very new to javascript so forgive me if im missing something really simple here. I want users to be able to favourite things like images and posts. I have a little heart icon that when clicked should turn red/black depending if they're adding/removing. Everything works apart from the .toggleClass. Can anyone point out where i am going wrong?
index.php
<div class="heart-box">
<?php
//Check if user has fav'd the image..
$hasFav = db::getInstance()->query("SELECT * FROM favourites WHERE userID = ? AND img_id = ?", array($the_user, $img_id));
$action = $hasFav->results() ? 'unfav-heart' : 'fav-heart';
?>
<div class="<?php echo $action; ?> fa fa-heart" id="<?php echo $img_id; ?>" ></div>
</div>
Script
$(document).ready(function(){
//add to favourites...
$('.fav-heart').click(function(){
var img_id = $(this).attr('id');
$.ajax({
url: 'favourites.php',
type: 'post',
async: false,
data:{
'fav' : img_id
},
success:function(){
$(img_id).toggleClass("unfav-heart");
}
});
});
// remove from favourites...
$('.unfav-heart').click(function(){
var img_id = $(this).attr('id');
$.ajax({
url: 'favourites.php',
type: 'post',
async: false,
data:{
'fav' : img_id
},
success:function(){
$(img_id).toggleClass("fav-heart");
}
});
});
});

As pointed out in the other answer, you left out the # prefix to indicate an ID in a selector. But there's no need to use a selector at all, since you have a variable pointing directly at the element.
$('.fav-heart').click(function(){
var img = $(this);
var img_id = this.id;
$.ajax({
url: 'favourites.php',
type: 'post',
async: false,
data:{
'fav' : img_id
},
success:function(){
img.toggleClass("unfav-heart");
}
});
});

JQuery id's need a # in the selector :
$(document).ready(function(){
//add to favourites...
$('.fav-heart').click(function(){
var img_id = $(this).attr('id');
$.ajax({
url: 'favourites.php',
type: 'post',
async: false,
data:{
'fav' : img_id
},
success:function(){
$("#"+img_id).toggleClass("unfav-heart");
}
});
});
// remove from favourites...
$('.unfav-heart').click(function(){
var img_id = $(this).attr('id');
$.ajax({
url: 'favourites.php',
type: 'post',
async: false,
data:{
'fav' : img_id
},
success:function(){
$("#"+img_id).toggleClass("fav-heart");
}
});
});
});

Your click handlers for both selectors are registered on document ready. That's why only these elements who match the selector classes are assigned to the click handler. If you toggle the class afterwards you have to reassign the click handlers.
A better approach would be to register a click handler for all heart elements. Inside the click handler you do a switch case statement where you toggle the class accordingly.

Suppressing and adding parameters for ajax call

I am trying to make an ajax call for two separate click events. The difference is for the second click event the variable testOne should not be part of the call and instead there would be a new variable. How should I approach this?
var varOne = '';
var varTwo = '';
var varThree = '';
function testAjax(){
$.ajax({
type: "POST",
dataType: 'html',
url: "http://someblabla.php",
data: {
testOne: varOne,
testTwo: varOne
}
}).done(function(data) {
$('.result').html(data);
});
}
$('.clickOne').click(function(){
varOne = 'xyz123';
varTwo = '123hbz';
testAjax();
});
$('.clickTwo').click(function(){
//varOne = 'xyz123'; // I dont need this for this click
varTwo = '123hbz';
varThree = 'kjsddfag'; // this gets added
testAjax();
});
<div class="clickOne"></div>
<div class="clickTwo"></div>

Make some like this
function testAjax(data){
$.ajax({
type: "POST",
dataType: 'html',
url: "http://someblabla.php",
data: data,
}).done(function(data) {
$('.result').html(data);
});
}
$('.clickOne').click(function(){
var data= {
varOne: 'xyz123',
varTwo: '123hbz',
}
testAjax(data);
});
$('.clickTwo').click(function(){
var data= {
varThree : 'kjsddfag',
varTwo: '123hbz',
}
testAjax(data);
});
<div class="clickOne"></div>
<div class="clickTwo"></div>

You can also do the same in other way with minimum line of code, you can call the ajax on click event and pass the data based on the element triggered the click event.
like this:
$('.ajax').click(function(e){
if($(this).hasClass('clickOne')){
var data= { varOne: 'xyz123'; varTwo: '123hbz'; }
}else{
var data= { varThree : 'kjsddfag'; varTwo: '123hbz'; }
}
$.ajax({
type: "POST",
dataType: 'json',
url: "http://someblabla.php",
data: data,
}).done(function(data) {
$('.result').html(data);
});
e.preventDefault();
});
<div class="ajax clickOne"></div>
<div class="ajax clickTwo"></div>
In this way you can put as many conditions for different data variable.

You should be doing it like this:
function testAjax(data){
$.ajax({
type: "POST",
dataType: 'html',
url: "http://someblabla.php",
data: data
}).done(function(data) {
$('.result').html(data);
});
}
$('.clickOne').click(function(){
var data {
varOne = 'xyz123',
varTwo = '123hbz'
}
testAjax(data);
});
$('.clickTwo').click(function(){
var data = {
varTwo = '123hbz',
varThree = 'kjsddfag'
}
testAjax(data);
});
<div class="clickOne"></div>
<div class="clickTwo"></div>
This way you absolute control over which variables are added to which ajax call. You should not use global variables unless you really need them to be global, which doesn't seem to be the case.
You can pass whatever JavaScript object to the data parameter of the ajax method.

I just wanted to add something. I often hide value inside the value attribute of the button tags to produce something like this.
I haven't been able to test this of course but I thought it was worth mentioning.
jquery:
var fields = '';
function testAjax(){
$.ajax({
type: "POST",
dataType: 'html',
url: "http://someblabla.php",
data: fields
}).done(function(data) {
$('.result').html(data);
});
}
$('#btn').click(function(){
var varCount = 0;
var vars = $(this).val().split('|');
$.each( vars, function( key, value ) {
varCount++;
fields = fields + 'var' + varCount + '=' + value + '&';
});
fields = fields.slice(0,-1);
$(this).val('123hbz|kjsddfag');
testAjax();
});
html:
<button id="btn" value="xyz123|123hbz"></button>

A more optimized and cleaner version -
var varTwo='junk1'
var varOne='junk2'
var varThree='junk3'
function testAjax(data){
$.ajax({
type: "POST",
dataType: 'html',
url: "http://someblabla.php",
data: data,
}).done(function(data) {
$('.result').html(data);
});
}
$('.ajaxClick').click(function(){
var data={};
if(this.classList.contains('clickOne')){
data.varOne=varOne;
data.varTwo=varTwo;
}else{
data.varThree=varThree;
data.varTwo=varTwo;
}
testAjax(data);
});
<div class="ajaxClick clickOne"></div>
<div class="ajaxClick clickTwo"></div>

Targeting specific element jquery

I have searched this on the net however couldn't find a solution, simply I would like to replace the content inside button element with ajax response. The only problem I am facing is that, the whole divs are being changed not the one I click on. If I change the class to id only the first one changes not the specific button I want. So how do I replace the content of specific button?
PHP Code:
while($row = $result->fetch_assoc()){// there are four rows so I have 4 buttons.
echo "<button class=btn btn-primary test' value='."$row['id']".'>."$row['voteup']".</button>";
}
javascript code:
$(function() {
$('.test').on('click', function() { // attach the click to the button
var test_val = $(this).val(); // Grab the value from the button
$.ajax({
type: "GET",
url: "test.php", // Move ?tar=vrate to the data array.
data: {tar: 'vrate', test: test_val},
cache: false,
success: function(response)
{
$(".test").fadeIn('slow').html(response);//this is replacing all 4 buttons not just one, if I change the class to id, only the first one is being replaced with the response. I also tried $( .test", this) but no luck.
}
});
});
});

$(function () {
$('.test').on('click', function () {
var test_val = $(this).val();
$.ajax({
// -------v Set the context of the callback
context: this,
type: "GET",
url: "test.php",
data: {
tar: 'vrate',
test: test_val
},
cache: false,
success: function (response) {
// v--and use `this` here
$(this).fadeIn('slow').html(response);
}
});
});
});

Try to use the $(this) reference here to achieve what you want,
$('.test').on('click', function() { // attach the click to the button
var test_val = $(this).val(); // Grab the value from the button
var $this = $(this);
$.ajax({
type: "GET",
url: "test.php", // Move ?tar=vrate to the data array.
data: {tar: 'vrate', test: test_val},
cache: false,
success: function(response)
{
$this.fadeIn('slow').html(response);
}
});
});

How to pass extra parameter in jquery post request from outside click event?

Hi i have jquery request like below ,
$('#filterForm').submit(function(e){
e.preventDefault();
var dataString = $('#filterForm').serialize();
var class2011 = document.getElementById("2011").className;
//var validate = validateFilter();
alert(dataString);
if(class2011=='yearOn')
{
dataString+='&year=2011';
document.getElementById("2011").className='yearOff';
}
else
{
document.getElementById("2011").className='yearOn';
}
alert (dataString);
$.ajax({
type: "POST",
url: "myServlet",
data: dataString,
success: function(data) {
/*var a = data;
alert(data);*/
}
});
and my Form is like ,
<form method="post" name="filterForm" id="filterForm">
<!-- some input elements -->
</form>
Well, I am triggering jquery submit on submit event of a form ,(it's working fine)
I want pass one extra parameter inside form which is not in above form content but it's outside in page
it's like below
[Check this image link for code preview][1]
So how can i trigger above event , on click of , element with class yearOn ( check above html snippet ) and class yearOff , with additional parameter of year set to either 2011 or 2010

$(document).ready(function () {
$('#filterForm').submit(function (e) {
e.preventDefault();
var dataString = $('#filterForm').serialize();
if ($("#2011").hasClass('yearOn')) {
dataString += '&year=2011';
$("#2011").removeClass('yearOn').addClass('yearOff');
}
else {
$("#2011").removeClass('yearOff').addClass('yearOn');
}
$.ajax({
url: "/myServlet",
type: "POST",
data: dataString,
success: function (data) {
/*var a = data;
alert(data);*/
}
});
});
});

1.) If you are using jQuery already, you can use the $.post() function provided by jquery. It will make your life easier in most cases.
2.) I have always had a successful post with extra parameters this way:
Build you extra parameters here
commands={
year:'2011'
};
Combine it with your form serialize
var dataString=$.param(commands)+'&'+$("#filterForm").serialize();
Perform your post here
$.post("myServlet",data,
function(data) {
/*var a = data;
alert(data);*/
}
);
OR use $.ajax if you really love it
$.ajax({
type: "POST",
url: "myServlet",
data: dataString,
success: function(data) {
/*var a = data;
alert(data);*/
}
In the end, here is the full code the way you are doing it now
$('#filterForm').submit(function(e){
e.preventDefault();
var class2011 = document.getElementById("2011").className;
//var validate = validateFilter();
alert(dataString);
if(class2011=='yearOn') {
dataString+='&year=2011';
document.getElementById("2011").className='yearOff';
} else {
document.getElementById("2011").className='yearOn';
}
commands={
year:'2011'
};
var dataString=$.param(commands)+'&'+$("#filterForm").serialize();
alert (dataString);
$.ajax({
type: "POST",
url: "myServlet",
data: dataString,
success: function(data) {
/*var a = data;
alert(data);*/
}
});