Develop Reference

How to get data attribute value using jquery

I am working on jquery with php,Right now i have button inside loop and i want to pass "data attribute" and want to get value,Right now i am getting "undefined",So how can i do this ?
Here is my current code
echo "<td>"."<a class='map-pop' data-id='".$employee_time['id']."' data-toggle='modal' data-target='#mapModal' onclick='viewmap();'><img src='assets/viewmap.png'></a>"."</td>";
<script>
function viewmap()
{
var ids = $(this).attr('data-id');
alert('id is ' + ids);
}
</script>

change your onclick to this
onclick='viewmap(this)'
and get data with jquery like this
function viewmap(elm){
var id = $(elm).data('id');
alert('id is ' + id);
}

Pass this in onclick function and get in viewmap function and access
You can try below code ..
PHP
<?php
echo "<td>"."<a class='map-pop' data-id='".$employee_time['id']."' data-toggle='modal' data-target='#mapModal' onclick='viewmap(this);'><img src='assets/viewmap.png'></a>"."</td>";
?>
Script
<script>
function viewmap(m)
{
var ids = m.attr('data-id');
alert('id is ' + ids);
}
</script>

The problem is that you are using this inside your function viewmap but you are not sending it as a parameter from the HTML code, Change your onclick by: onclick='viewmap(this); than change the js function like bellow:
function viewmap(e)
{
var ids = $(e).attr('data-id');
alert('id is ' + ids);
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<a class='map-pop' data-id='1254' data-toggle='modal' data-target='#mapModal' onclick='viewmap(this);'>
click here
</a>

Remove onclick attribute and change the viemap() function like this
$(".map-pop").click(function(e) {
e.preventDefault();
let ids = $(this).data('id');
alert(`id is ${ids}`);
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<a class='map-pop' data-id='".$employee_time['id']."' data-toggle='modal' data-target='#mapModal'><img src='assets/viewmap.png'></a>
`

How to add a function to an appended element

I have an input-text. If you type something, the text appears below (see code snippet).
Now, I need to do the same with a previous step: clicking a button (preferably a checkbox) to append/remove all. Here is my failed idea: DEMO (it appends the input text, but when you type, text won't apear below like it does on my code snippet).
I feel like the function to add text below does not work because there is a problem with selecting the appended element. How do I do this?
Any more simple idea to do this would be great
var name1 = document.getElementById('name');
name1.addEventListener('input', function() {
var result = document.querySelector('.X');
console.log(this.value );
result.innerHTML = this.value;
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<label>What is your name? </label><input type="text" id="name">
<p>Your name is: <span class="X"></span></p>

Put your first part of the snippet into appending logic while clicking the add button. As in your codes, the input box is appended to the document after its listener being attached.
if (!added) {
$content = $(NewContent).appendTo('.firstappend');
// attach listener after input box actually exists!
var name1 = document.getElementById('A');
name1.addEventListener('input', function() {
var result = document.querySelector('span.Y');
console.log(this.value );
result.innerHTML = this.value;
});
}

$(function() {
let NewContent = '<div class="added">' +
'<p>' +
'<label>What is your name? </label>' +
'<input type="text" id="A">' +
'</p>' +
'<p>Your name is: <span class="Y"></span></p>' +
'</div>';
$(".addremove").on('click', function() {
if ($(".added").length) {
$(".added").remove();
} else {
$(".firstappend").append(NewContent);
}
});
$(document).on('change keyup', '#A', function(event) {
$("span.Y").html($(event.currentTarget).val());
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="toadd">
<button type="button" class="addremove">Do you have a name?</button>
</div>
<div class="firstappend"></div>
as from the DEMO you included,
appended elements to document cannot be invoked explicitly, since you're using jQuery, you can do this
$(document).on('change keyup', '#A', function(event) {
$("span.Y").html($(event.currentTarget).val());
});

append value to href using jquery

I basically have a field element with name="one".As soon as I fill the field,the value should be appended to an href <a name="number" href="example.php" </a> .
It should append it in the format href="example.php?number=one" after i fill the field.Is this possible?Im new to jquery.
I have this for getting the values in the jquery
var num = $("[name='number']").val();
but the rest,appending things,im not sure how to do that.Any help?

Try
var $a = $('a[name="number"]');
//store the original value so that we can handler multiple changes
$a.data('href', $a.attr('href'))
$("#one").change(function () {
$a.attr('href', $a.data('href') + '?number=' + this.value)
});
Demo: Fiddle
Note: This solution does not support handling values from multiple input elements

With this:
var $a = $("a[name=number]"),
href = $a.attr("href");
$a.attr("href", href.split('?')[0] + "?number=" + num);
Cheers

DEMO : http://jsfiddle.net/ETsA8/5/
Html :
<a name="number" href="example.php">ss </a>
<input id="one" type="text" >
Js:
$( document ).ready(function() {
var link = $("[name='number']").attr("href");
$("#one").change(function(){
var a_href = $("#one").val();
$("[name='number']").attr("href", link+'?number='+a_href);
});
});

$('a[name="number"]').attr(href(function(i, oldhref) {
return oldhref + '?number=' + value;
});

How I find the checkbox by id and apply attribute on string using JQuery?

I have a following html string of contentString:
var content =
'<div id="content">' +
'<div>' +
'<input name="tBox" id="select" type="checkbox" value="" '+
'onclick="changeView()"> Select for operation' +
'<p style="text-align:right">View details</p>' +
'</div>' +
'</div>';
Here, How I find the checkbox select by id and add attribute checked on changeView() function?
function changeView(m) {
//find the select id from content string
var checkbox = content.find($('#select'+m));
// Apply the checked property on checkbox.
checkbox.attr("checked","checked");
}
Thanks in advance.

If you convert it to a JQuery object first then you can do it like this:
var contentObj = $(content);
var checkbox = contentObj.find("#select");
checkbox.attr("checked", true);
then if you need it back at html string:
content = contentObj[0].outerHTML;
Note: If outerHTML is not working as expected, the following JQuery can be used as an alternative:
content = contentObj.clone().wrap('<div>').parent().html();
If m is meant to be the id you want to find (e.g. "select"), then use this:
var checkbox = contentObj.find("#" + m);
Live Example: Here is a working example
Here is the complete function for easy reference:
function changeView(m) {
var contentObj = $(content);
var checkbox = contentObj.find("#" + m);
checkbox.attr("checked", true);
content = contentObj[0].outerHTML;
}

You need to compile the string into a DOM object first by wrapping it in a jQuery call first. Then you can use the find method.
So:
var dom = $(content),
select = dom.find('#select');
In any case, there is no need to add the 'checked' attribute, because when you click the checkbox, it will automatically become checked.
If however, you want to still programmatically check it:
select.on('click', function () {
this.attr('checked', 'checked');
});

Simply like this
function changeView(m) {
//find the select id from content string
var checkbox = content.find('#select');
// Apply the checked property on checkbox.
checkbox.attr("checked","checked");
}
if you want to pass id then
function changeView(m) {
//find the select id from content string
var checkbox = content.find("#" + m);
// Apply the checked property on checkbox.
checkbox.attr("checked","checked");
}

Since you're using the onclick handler, you don't really need to do any of that :
in html : onclick="changeView(this);"
function changeView(box) {
if(box.checked) { stuff; }
// or get jquery ref to that box :
$(box).prop("checked", true);
}

Calling function from button not working for html created using javascript

I am using javascript to create html page , but not able to call some function on button click .
var alernative = "plot1";
var buttonvalue= "mybutton";
function callme()
{alert("hello");}
$('#' + alernative).html('<div><input style="float:right;" type="button" value="' + buttonvalue+ '" onclick="' + callme() + '";></div>');
In above code , creating a button and giving its value and calling function onclick of button , but when the page loads it shows alert (that should not happen) and it is not alerting on button click .
Hoping for Suggestion or some help .

You need to pass the function name as a part of the string:
$('#' + alernative).html('<div><input style="float:right;" type="button" value="' + buttonvalue+ '" onclick="callme();"></div>');

It is a bad practice to write HTML with strings, DOM exists for one reason!
var input = $('<input/>', {
type: "button",
style: "float: right",
value: buttonValue
}),
element = $('<div/>').append(input);
input.click(function () {
callme();
});
$('#test').html(element);