Develop Reference

How to use hide() in Javascript

I am trying to hide a div the id of which I stored in a variable named 'post_container_id'. My code is:
document.addEventListener('DOMContentLoaded', function() {
// Add event listener to following button
document.querySelectorAll('.post-edit').forEach(item => {
var itemid = item.getAttribute('id').slice(5,)
item.addEventListener('click', () => edit_post(itemid));
})
});
function edit_post(itemid) {
var post_container_id = `#post-container-${itemid}`;
(function(){
$(post_container_id).hide(1000);
});
};
This does not hide the div. It does not throw any error either. The function does get triggered (I checked it by logging to console). What am I doing wrong?

There is a mistake here:
(function(){
$(post_container_id).hide(1000);
});
You are just declaring the function, you should also call it:
(function(){
$(post_container_id).hide(1000);
})();
Also, the callback is useless in this case, you can just solve it as:
function edit_post(itemid) {
var post_container_id = `#post-container-${itemid}`;
$(post_container_id).hide(1000);
};
$("#hide").click(function(){
edit_post(1);
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id="post-container-1">secret</div>
<button id="hide">Click to hide</button>

You can also use vanilla JavaScript to hide/show the element directly by changing the style display property. As follows
function edit_post(itemid) {
const post_container_id = document.querySelectorAll(`#post-container-${itemid}`);
post_container_id.style.display = 'none';
};

Without jQuery,
document.getElementById(post_container_id).style.display = "none"

How can I read ".on()" method arguments in jQuery?

I have no idea how to bite this problem. Below two examples are working great but I want to avoid the DRY problem.
parentElement.on('focusout', '.foo-class', function () {
// console.log('hello foo')
});
and:
parentElement.on('focusout', '.bar-class', function () {
// console.log('hello bar')
});
I would like to make it more universal. I have to deal with two classes while the parent stays the same.
Assuming that this is the first step:
parentElement.on('focusout', classValue, function () {
// How to display this class so I can call different stuff depending on the class value?
// console.log('hello ' + classValue)
});

May be something along these line, refined from guardio's solution.
Fiddle: https://jsfiddle.net/pvorhknv/2/
What it doing here is to get the element been called for the handler and accessing the attributes. You can use this element "this" for any such use.
$(document).on('focusout', 'input', callme);
function callme(){
console.log('hello ' + $(this).attr('class').split('-')[0])
}
UPDATE:
One other thing you can use it to mark data attribute for the elements.
Fiddle: https://jsfiddle.net/pvorhknv/3/
<input type='text' class='foo-class' data-classname="foo">
<input type='text' class='bar-class' data-classname="bar">
And hence you can access them,
function callme(){
console.log('hello ' + $(this).data('classname'));
}

To look if the (1) element has a particular class, and to (2) get all classes of $(this), see following:
parentElement.on('focusout', classValue, function () {
// (1). find out if element has class 'foo-class'
if $(this).hasClass('foo-class'){
// ...
}
// (2). for each class of element do something
$($(this).attr('class').split(' ')).each(function() {
if (this !== '') {
// ...
}
});
)};

You can use data attribute for specify event which you want to run. My solution is below (simple nothing more nothing less):
html
<div class="event" data-color-event="blue">click me = blue</div>
js
// one listener
$('body').on('click', '.event', function() {
var ev = $(this).data('color-event');
$('body')[ev]();
});
// event functions on demand
$.fn.blue = function() {
alert('blue');
}
$.fn.red = function() {
alert('red');
}
JSFIDDLE DEMO

Separate your classes with commas, and then check the class in the callback.
https://jsfiddle.net/guanzo/dmpgxxt0/
$('.container').on('click','.test1,.test2',function(){
console.log($(this).attr('class'))
})

Did you try
parentElement.on('focusout', '.foo-class, .bar-class', function () {
// console.log('hello foo')
});
And more:
parentElement
.on('focusout', '.foo-class, .bar-class', function () {
// console.log('hello foo')
})
.on('click', '.baz-class', function() { alert('xx'); })
;

How to get jquery variable childeren?

Hi I have a method that accepts an id as a parameter for my function:
function exportDetails($div) {
$($div).each(function () {
alert(this.id);
});
I need to get all the table's id's that are within this div, something similar to this:
function exportDetails($div) {
$($div > table).each(function () {
alert(this.id);
});
Here is how I am calling the function and each of the itemDetails have dynamically generated tables and I need to get their id's since they are all unique:
exportDetails.apply(this, [$('#itemDetails')]);
Thanks!

Something like this should work:
function exportDetails($div) {
return [].map.call($div.children('table'), function(table) {
return table.id;
});
}
i.e. just return an array containing the .id of every table element found as an immediate descendant of $div.

You code is not formatted correctly. Also, I don't know if you are feeding this function a group of tables that are inside of your $div parameter. Here are some options.
// this works if you pass in an element with nested table that have ids.
function exportTableToCSV($div) {
$($div+ ' > table').each(function () {
alert( $(this).attr('id') );
});
}
// this works if you want to get all the HTML elements with an id or if you want to get all the ids of elements which also have the same class assigned to them.
function exportTableToCSV($div) {
$($div).each(function () {
alert( $(this).attr('id') );
});
}
exportTableToCSV('div');
// or
exportTableToCSV('.yourClass');

Have the element who call my js function

I know my question have answer in the past but I don't have the vocabulary to find this.
I call a JavaScript function like this:
Voir +
This function change the state of the element .stats-table but I want to know which button have been clicked to call this function?
Better : can I have a jQuery object of this button?

Try to pass the this reference to know which button was clicked,
HTML:
Voir +
JS:
function showTable(selec,elem){
var currentElem = $(elem); //Clicked element
}

If you don't want to change the signature of the function and the way you invoke it (as others have suggested), you can use the global window.event to identify the clicked element:
function showTable(selector)
{
var clickedElement = window.event.target;
//...
}
See MDN.

When you use jQuery, you might consider refactor your code like this:
$(document).ready(function(){
$('.show-table-link').on('click', function(){
var $usedButton = $(this)
showTable('.stats-table')
}
})
Voir +
It's good practice to attach the on click handler instead of writing it inline. Further reading document.ready and jQuery event basics.

You can pass any value or id and your can identify the function
<script type="text/javascript">
function showTable(clss_name,fun_id)
{
if(fun_id=='A1')
{
alert("First function Executed");
}
if(fun_id=='A2')
{
alert("Second Function is executed");
}
}
</script>
......
......
......
Voir +
Voir2 +

If your function is like this:
function showTable(selec) {
// some code
}
You can get the clicked element like this, using this:
function showTable(selec) {
// some code
var clickedElem = this;
}

Create Generic Javascript/Jquery ajax function

I'm new to javascript, jquery, and ajax and need help making my code more efficient. I have the following javascript/jquery function that works fine:
<script type="text/javascript">
$(document).ready(function()
{
$("#promo1").change(function() //select menu id that triggers script on change
{
//data here
$.ajax
({
//ajax stuff here
{
//individual values from json array
//set each value textbook value
$("#discprice1").val(disc);
$("#itemprice1").val(total);
$("#tax").val(tax);
$("#grandtotal").val(grand);
}
});
});
});
</script>
I change my original function to this after a suggestion:
<script type="text/javascript">
$(document).ready(function()
{
var setupCalculation = function(index) {
$("#promo" + index).on("change", function() //select menu id that triggers script on change
{
//rest of the function is here....
and change my select to this:
<select name="promo<?php echo $i; ?>" id="promo<?php echo $i; ?>"
onchange="setupCalculation('<?php echo $i; ?>');">
However, it is not working. What am I missing?
However, I need to do the same thing 10 times for 10 different rows of calculations. How can I make it so I can use this function generically and just pass the "id" of the select box to the function and not repeat this code 10 times for each of the selectors, e.g. #promo1, #promo2, #promo3, etc....
I'm assuming I need to add onchange="javascript function here();" to the html code, but I can't get it to work.
Thanks!

This is a case when you should write a little plugin. Take a look how it can look like (I did'nt get what exectly you need but you will grasp the idea):
$.fn.myFirstPlugin = functin() {
return this.each(function() {
// This is currect select box
var $select = $(this);
// Change event
$select.change(function() {
// Do something for this select box; $(this) will point to current select element
$.ajax({ ... })
});
})
};
Then you would use it like:
$('#promo1, #promo2, #promo3').myFirstPlugin();

Instead of using an "onchange" attribute inline, I would use your current approach to wireup the event handler. That way you can define a function setupCalculation that wires up the logic for a given select list.
$(document).ready(function() {
var setupCalculation = function(id) {
$("#" + id).on("change", function() {
// ajax/calculation logic
});
}
setupCalculation("promo1");
setupCalculation("promo2");
// ...etc
});
If the result elements are different (eg discprice2, discprice3, etc), then it may be better to pass an index to the function instead, and hard-code the name part of the ids:
var setupCalculation = function(index) {
$("#promo" + index).on("change", function() {
// ajax stuff
$("#discprice" + index).val(disc);
// etc
});
}
Edit Using the form onchange=setupCalculation(), the function should look like this (no need to wire up the change event):
$(document).ready(function()
{
window.setupCalculation = function(index) {
//rest of the function is here....

sounds like your select boxes look like
<select id="promo1">...</select>
<select id="promo2">...</select>
add a class to each one
<select id="promo1" class="promo">...</select>
<select id="promo2" class="promo">...</select>
so that you can select all the boxes with one simple selector for the change event function:
$(".promo").change(function() {
...
});

You could set up a jQuery function and call it from the selected object:
$.fn.changePromo = function() {
/* return this jQuery object to allow chaining and execute in an 'each()' to allow multiple elements */
return this.each( function() {
$( this ).change( function() {
/* your ajax call here */
} );
} );
}
/* call examples */
$( '#promo1' ).changePromo();
$( '#promo1,#promo2' ).changePromo();