We Keep Coding

Using .after but only if the value does not exist

I am running this code to insert a HTML line after the id #wp_menu:
$(document).on('closing', '.remodal', function (e) {
$('.menu_name').each(function() {
$('#wp_menu').after('<div class="tag">' + $(this).val() + '</div>');
});
});
The problem is, every time I run this loop, I'll get duplicated values and this is not what I want. How can I check if the code was inserted before?
This is a simple example that may explain my problem: https://jsfiddle.net/vLqonqpk/
So when you click on "add" multiple times, it will add the same values over and over again.

You could do something like this:
arr = [];
$('button').click(function() {
$('ul input').each(function() {
if ($.inArray($(this).val(), arr) == -1) {
$('#wp_menu').after('<div class="tag">' + $(this).val() + '</div>');
arr.push($(this).val());
}
});
console.log(arr);
});
DEMO: https://jsfiddle.net/vLqonqpk/1/
So, create array of values, check if current val(s) from inputs are duplicated, and place just unique values. Of course, you can add additional checks for empty string, and give user some alerts/warnings (create else block for that purpose), if needed, etc, etc...
But this is basic idea which should work.

Simply isolate the jQuery selector and check its existence.
$(document).on('closing', '.remodal', function (e) {
$('.menu_name').each(function() {
var $wp_menu = $('#wp_menu');
var $tag = $wp_menu.next('.tag'); // .siblings() also works
// Now you check if it exists, and create it if not
if (!$tag.length)
$tag = $('<div class="tag">').insertAfter($wp_menu);
// Simply update the content, element will always exist
$tag.text($(this).val()); // .html() also works
});
});
I'm sure there's several ways to do it, this is just one of them.
I now realize your problem is not duplicating tags, but values. Basically you want a HashSet. Please accept sinisake's answer instead

How to add a div tag at the same place after it is removed

I want to remove the headers befor i expor the data into excel, hide doesnt work because the data is still there, so i was using remove. but once removed, after the exporting to excel is completed i wanted to undo the removed headers for display.
<script type="text/javascript">
$("#btnExport").click(function(e) {
alert("");
$head=$('tr.header');
$div=$('#dvData')
$div.remove('tr.header');
alert();
window.open('data:application/vnd.ms-excel,' +encodeURIComponent($div.html()));
e.preventDefault();
});
</script>
i was trying to save the div object in a variable process on that variable div and send it, bt the div sent shows no changes!!

Just make a clone, remove whatever you want, and get the HTML
$("#btnExport").click(function(e) {
e.preventDefault();
var div = $('#dvData'),
clone = div.clone();
clone.find('tr.header').remove();
window.open('data:application/vnd.ms-excel,' + encodeURIComponent( clone.html() ));
});

append saved variable to parent of the deleted div.

Add it before the target element...remove it post that...
$(function() {
$('#add').click(function(){
var div = $('div.toRemove');
var newDiv = $('<div/>').addClass('added').html('hello world');
//newDiv.prependTo(div);
div.before(newDiv);
this.disabled = true;
div.remove();
});
$('#reset').click(function(){
$('div').remove();
$(document.body).append($('<div/>').addClass('toRemove').html('toremove'));
$('#add').removeAttr('disabled');
});
});
Fiddle: http://jsfiddle.net/deostroll/wnu9pv9y/

First of all, You must use var for each variable such as $head and $div
You can use clone to achieve the desired result.
$("#btnExport").click(function(e) {
var $clonedDiv = $('#dvData').clone(true);
$clonedDiv.find("tr.header");
window.open('data:application/vnd.ms-excel,' +encodeURIComponent($clonedDiv.html()));
e.preventDefault();
});
</script>
use clone(true) to retain the events

As per understanding you first want to remove the header before export and then want to add to the table as it is. if i am properly understanding your requirement try the following
$("#btnExport").click(function (e) {
alert("");
$div = $('#dvData')
$divToRemain = $div.find('#TableId thead')
$div.find('#TableId thead').remove();
window.open('data:application/vnd.ms-excel,' + encodeURIComponent($div.html()));
$divToRemain.appendTo('#tblHoliday');
e.preventDefault();
});
Here i save the removed header in the variable and after export i appended it to the table.
Hope this will help.

unable to get the input id that triggered the event using event.target.id

I have this code right here for getting the id of a clicked input element:
jQuery(event.target.id).change(function(){
if(event.target.id===null)
{
}
else
{
alert(event.target.id);
}
});
for example: i have a dynamically generated textbox. Upon clicking it using the code above, it returns the id.
However when I click a dropdown list input, it returns null, but when inspecting the element, the id is there. It still goes to the else block.
I am using this event for fields that were dynamically generated.
What might be wrong?
Sorry if it seems noobish I am new on jQuery.

On select elements you need to listen to the change event, not the click event:
$('select').change(function() {
var selectId = $(this).attr('id');
var optionId = $(this).find(":selected").attr('id');
alert('select id:' + selectId);
alert('option id: ' + optionId);
});
UPDATE
Usually in a select element you would be looking for the option value. This is how you would do that:
$('#selectId').change(function() {
var optionValue = $(this).find(":selected").val()
alert(optionValue);
});

Try access original target
var originalElement = event.srcElement || event.originalTarget;
console.log(originalElement.id)

append value to an input field in JQuery

I have an input type="tel" with id="#enter" and I want to add append values from button clicks. I have done this:
$("#one").click(function () {
$("#myInput").val("1");
});
$("#two").click(function () {
$("#myInput").val("2");
});
So every time a button is pressed from #id 1-9 it enters the corresponding numeric value.
However this doesn't append the value in the input field type just replaces the existing value with the value of the button clicked. How can it append the values?
This is the JSFiddle

You can use something like this to append values:
$("#myInput").val(function() {
return this.value + '1';
});
You can also improve your approach by giving each number button a class and register the same event listener for all buttons. For example:
$(".dial").click(function () {
var number = $(this).data('number');
$("#myInput").val(function() {
return this.value + number;
});
});
Where the button would be defined as
<button type="button" class="btn btn-primary btn-xs1 dial" data-number="4"> <b>GHI<br>4
as so on.
Demo: http://jsfiddle.net/8R9xL/2/

Try this
$("#one").click(function(){
$("#myInput").val($("#myInput").val()+"1");
});

Of course it doesn't append the value, you've done nothing to make it append the value.
To append the value you have to...append the value. Get the current value, add (append) something to it, and then set that.
$("#one").click(function(){
var input = $("#myInput");
input.val(input.val() + "1");
});
$("#two").click(function(){
var input = $("#myInput")
input.val(input.val() + "2");
});

$("#one").click(function(){
var input = $("#myInput");
input.val(parseInt(input.val() + 1));
});
$("#two").click(function(){
var input = $("#myInput")
input.val(parseInt(input.val() + 2));
});

I have done something like this.
$('.pin-number').on('click', (e) => {
$('#pin').val($('#pin').val() + e.target.innerText)
})
Where .pin-number is a set of divs containing a number from 0 to 9 (this is the reason that I use e.target.innerText instead of e.target.value), and #pin is the input where the values are inserted.
Hope this helps!

Append input value to a div

can someone show me how to take an input value and append it to a div once the user clicks on an Add link?
This is the best I could do.
HTML:
<div id="customUtility-container"></div>
Add
jQuery:
$(function() {
var addDiv = $('#customUtility-container');
var i = $('#customUtility-container').size() + 1;
$('#addUtility').live('click', function() {
$('#customUtility').val().appendTo(addDiv);
$('<p><label for="customUtility-container"><input type="text" id="customUtility" size="20" name="customUtility_' + i +'" value="" placeholder="" /></label> Remove</p>').appendTo(addDiv);
i++;
return false;
});
$('#removeUtility').live('click', function() {
if( i > 2 ) {
$(this).parents('p').remove();
i--;
}
return false;
});
This creates another input field however; I just want to have one input box, have the user click Add, then it takes that value, puts it into the list, and clears the input box so the user can add something else again.

Use jQuery's append() function
addDiv.append($('#customUtility').val());
Here's a working fiddle.
Warning: opinion below
When creating a variable to store a jQuery object, I think it's helpful to prefix the variable with $. This way, you know that you're working with a jQuery object. It also makes it easier for those coming behind you to recognize what you're doing:
var $addDiv = $('#customUtility-container');
$addDiv.append($('#customUtility').val());

Something like:
addDiv.html(addDiv.html() + whateveryouwanttoadd)

addDiv.append($('#customUtility').val());

Change
$('#customUtility').val().appendTo(addDiv);
To
addDiv.append($('#customUtility').val());
val() method gives the value of the input element and you cannot call a jQuery method on a string which will throw an error.
Working demo - http://jsfiddle.net/t9D8R/

I ended up scrapping everything and redoing it:
$(function() {
var i = $('#customUtility-container').size() + 1;
$("#addUtility").on("click", function() {
$("#customUtility-container").append('<div id ="customUtility_' + i +' " name="customUtility_' + i +' ">'+ $("#customUtility").val() + 'Remove</div>');
});
$('#removeUtility').live('click', function() { $(this).closest('div').remove();
i--;
});
});