We Keep Coding

Loop through ol in jQuery and remove class and text

I have to loop through a ol and then get each of the li and then remove the text and add "<a" element to it.
Following is the html that is rendered:
<ol class="progress">
<li class="list-group-item text-muted list-group-item-success active">
General Information<span>1</span>
</li>
</ol>
I want to remove all the classes except "active" and then wrap the text with General Information
Like below
<ol class="progress">
<li class="active">
General Information<span> 1</span>
</li>
</ol>
I have tried to loop through the Ol using the script below but it seems to not find anything
$('ol.progress').each(function (i, li) {
var listItem = li;
var lm = $(li).text();
console.log(lm);
});

I see you are using JQuery - so let's stick to this.
You are looping over the ol but you want to loop over the ol's lis.
So replace
$('ol.progress').each....
by
$('ol.progress li').each....
You can remove all classes with the .removeClass() without any parameters.
But as you want to preserve the active-class you have to preserve this attribute - in my version of the code (see below) I will use a variable for this.
In addition you want to replace the HTML-part and not the text-part - so your snippet would read
$('ol.progress li').each(function () {
var is_active = false;
is_active = $(this).hasClass('active');
$(this).removeClass();
if(is_active){
$(this).addClass('active');
}
var newcontent = '' + $(this).html() + "";
$(this).html(newcontent);
});

With vanilla js:
document
.querySelectorAll('ol.progress > *') // all children of <ol> with class .progress
.foreach(elem => {
elem.className = 'active'
elem.innerHTML = `${elem.innerHTML}`
})

With jquery, as you can see, I check if the element has a class, then I remove all the classes and add active if it had it.
$('ol.progress li').each(function(i, li) {
var listItem = li;
if ($(li).hasClass('active')) {
$(li).removeAttr('class');
$(li).addClass('active');
} else {
$(li).removeAttr('class');
}
});
.active {
color: red;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<ol class="progress">
<li class="list-group-item text-muted list-group-item-success active">
General Information<span>1</span>
</li>
<li class="list-group-item text-muted list-group-item-success">
General Information<span>2</span>
</li>
<li class="list-group-item text-muted list-group-item-success">
General Information<span>3</span>
</li>
</ol>
In your code you forgot li into selector so $('ol.progress li') instead of $('ol.progress')

Jquery how to get ID and Title

Hello I have a UL and LI it working with function click but if get the title it not work.
Exemple:
// it work but not get title
$("#list li").on('click', function() {
var get_id = $(this).attr('id');
var get_title = ///??? how to get title h2 selector
//alert(get_id);
console.log($(this).text());
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/core.js"></script>
<ul id="list">
<li id="myID">
<h2>Title</h2> First One </li>
<li id="myID2">
<h2>Title 2</h2> Two </li>
<li id="myID4">
<h3>Title 3</h3> Tree </li>
</ul>

You need to select the h2 element then get the text using text() like :
var get_title = $(this).find('h2').text();
As #ParthShah suggested you could use a global class like title_content on your title elements, so you could target it easily using class selector :
var get_title = $(this).find('.title_content').text();
$("#list li").on('click', function() {
var get_id = $(this).attr('id');
var get_title = $(this).find('.title_content').text();
console.log(get_id + ' - ' + get_title);
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<ul id="list">
<li id="myID"><h2 class="title_content">Title</h2> First One </li>
<li id="myID2"><h2 class="title_content">Title 2</h2> Two </li>
<li id="myID4"><h3 class="title_content">Title 3</h3> Tree </li>
</ul>

Use :header. No need to worry for any h1,h2,h3... tag.
$("#list li").on('click', function() {
var get_id = $(this).attr('id');
var get_title = $(this).find(":header").text();
console.log(get_title);
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<ul id="list">
<li id="myID">
<h2>Title</h2> First One </li>
<li id="myID2">
<h2>Title 2</h2> Two </li>
<li id="myID4">
<h3>Title 3</h3> Tree </li>
</ul>
</div>

use jQuery's find to query within your element.
var get_title = $(this).find("h2,h3").text() //add h4,h5 etc if you need to find those too.

https://jsfiddle.net/povu503s/
$(this).children().html();
Will take the first child and grab the HTML inside

The title is a children of your targeted li. Use the .children() function to target that heading.
Hope this helps :>
// it work but not get title
$("#list li").on('click',function(){
var get_id = $(this).attr('id');
var get_title = $(this).children().text();
alert(get_title)
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<ul id="list" >
<li id="myID" > <h2>Title</h2> First One </li>
<li id="myID2" > <h2>Title 2</h2> Two </li>
<li id="myID4" > <h3>Title 3</h3> Tree </li>
</ul>

give class like "title_content" to your h2 and h3 tag and then fetch title by class name.
$("#list li").on('click', function() {
var get_id = $(this).attr('id');
var get_title = $(".title_content", this).text();
console.log(get_id + ' - ' + get_title);
});

Please Refer below Fiddle..
Fiddle
You can use any of below
1. var get_title = $(this).find(':header').text();
2. var get_title = $(this).children().text();

Closest function in jQuery and extracting the elements

I have a html fragment as follows:
<div id="samplediv">
<ul>
<li name="A">
<a id="A">
</li>
<li name="B">
<a id="B">
</li>
</ul>
</div>
I have a text called:
var text = "B";
I have want to check if the text matches with any of the elements of li and add a class name "disable" for the anchor element not matching with text.
I my case I want to add a class called "disable" for
<a id="A">
This is what I have tried:
$("#samplediv li").each(function() {
if($(this).name != text){
$(this).closest("a").addClass("disabled");
}
});
But the thing here is $(this).name is evaluating to "undefined" . What is it that I am missing?
Edit: Due to typo ,had missed the tag

There are multiple issues,
$(this) returns a jQuery object which does not have name property, instead you can use $(this).attr('name')
.closest() is used to find the ancestor element, but the a is a descendant of the li element, so you need to use find()
You can find all the li elements which does not have the given name and then find the a element within it like
var text = 'B';
$("#samplediv li").not('[name="' + text + '"]').find("a").addClass("disabled");
a.disabled {
color: green;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="samplediv">
<ul>
<li name="A">
<a id="A">a</a>
</li>
<li name="B">
<a id="B">b</a>
</li>
</ul>
</div>

var text = "B";
$("#samplediv li").filter(function() {//use filter
return $(this).attr('name') != text;//use .attr() to get name attribute
}).find('a').addClass("disabled");//use find to get the anchor tag
.disabled{color:red}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="samplediv">
<ul>
<li name="A">
<a id="A">a</a>
</li>
<li name="B">
<a id="B">b</a>
</li>
</ul>
</div>
Use .filter()
Description: Reduce the set of matched elements to those that match the selector or pass the function's test.

Target element by attr then append class jQuery

I have a li tag that looks like :
<li class="item maybe" data-selected="1"></li>
<li class="item confused" data-selected="2"></li>
<li class="item why" data-selected="3"></li>
I then have three other elements that look like :
<li class="display"></li>
<li class="display"></li>
<li class="display"></li>
I'm trying to on select of one of the elements append the class to my 2nd list of elements.
So if I selected the li tag with data-selector="1" then my first li tag in my display list will have the class maybe added.
This is what i've tried so far, but i'm getting undefined when I console log my var out :
if ($('.item').attr('data-selected') == 1) {
var itemClassAdd = $('.item').find("[data-selected='1']").attr('class');
console.log(itemClassAdd);
$(".display").addClass(itemClassAdd);
}
Thanks!

I perform action in a click event for convenience:
$("li.item").click(function(){
var index = $(this).data("selected");
$("li.display").eq(index - 1).addClass($(this).attr("class"));
});
If you don't need class item:
$("li.item").click(function(){
var index = $(this).data("selected");
var c = $(this).attr("class").replace("item ", "");
$("li.display").eq(index - 1).addClass(c);
});

The class and the attribute are on the same element, so you use a compound selector, not find:
var itemClassAdd = $('.item[data-selected="1"]').attr('class');
But note that
if ($('.item').attr('data-selected') == 1) {
will only branch of the first element matching .item has data-selected="1", which may or may not be what you want.
Live Example:
if ($('.item').attr('data-selected') == 1) {
var itemClassAdd = $('.item[data-selected="1"]').attr('class');
$(".display").addClass(itemClassAdd);
}
.maybe {
color: green;
}
<ul>
<li class="item maybe" data-selected="1">maybe</li>
<li class="item confused" data-selected="2">confused</li>
<li class="item why" data-selected="3">why</li>
</ul>
<ul>
<li class="display">d1</li>
<li class="display">d2</li>
<li class="display">d3</li>
</ul>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>

adding extra identifiers to dom elements

I have a bunch of menu items in a list format like so
<ul class="menu unselectable">
<li class="group">
Group Title
<ul>
<li class="groupItem i0">item 0</li>
<li class="groupItem i1 over">item 1</li>
</ul>
</li>
<li class="group">
Another Group Title
<ul>
<li class="groupItem i2">item 2</li>
<li class="groupItem i1">item 1 (if I hover here, the others should too</li>
</ul>
</li>
</ul>
The idea is, if I hover on one item with class i1 then all i1 items should behave the same. So I thought of adding a class over to all i1 items when I hover on any of them like so.
$(".groupItem").hover(
function () {
$(this).addClass("over");
},
function () {
$(this).removeClass("over");
}
);
The problem is I can't think of a way to identify what item has just been hovered on aside from $(this). To remedy this I thought of adding i1 as an id to items, but different dom nodes shouldn't have the same id. My next idea was to add the attribute value to the li items but to no avail (when I did a quick test with $(this).val() kept returning 0 regardless of the value actually stored in the node.
Is there any way I can add an identifier so I can just say $(this).<someIdentifier> , and target all the dom nodes with that identifier?

you can add an attribute groupID="{id}" and then call $(this).attr('groupID')

Element.prototype.secondId = '';
and than
document.getElementById('id5').secondId = 13;
As this you just set on any element a new property which you can use as you wish but is just in javascript not in html.

I don't recommend adding false attributes to elements, and this will work even if data attributes are not well supported by the user's browser:
$(".groupItem").hover(
function () {
var className = this.className.split(' ')[1];
$('.' + className).addClass("over");
},
function () {
var className = this.className.split(' ')[1];
$('.' + className).removeClass("over");
}
);
NOTE: Requires that classes are always organized as you specified above. A safer way could be:
var className = $.trim(this.className.replace('groupItem',''));

$(this).filter('#selector')

Please, Try working below code as below once:
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.6.1/jquery.min.js" type="text/javascript"></script>
<style>
.menu{ display:inline;}
.menu li{ display:inline; float: left;width: 100px;}
.menu li ul{display:none;}
</style>
<script type="text/javascript">
$(document).ready(function(){
$(".group").hover(
function () {
$(this).find("ul").show();
},
function () {
$(this).find("ul").hide();
}
);
});
</script>
</head>
<body>
<ul class="menu">
<li class="group">
Group Title
<ul>
<li>GT 1</li>
<li>GT 2</li>
</ul>
</li>
<li class="group">
Trochlear Nerve
<ul>
<li>TN 1</li>
<li>TN 2</li>
</ul>
</li>
</ul>
</body>
</html>