jQuery append() vs appendChild() - javascript

Here's some sample code:
function addTextNode(){
var newtext = document.createTextNode(" Some text added dynamically. ");
var para = document.getElementById("p1");
para.appendChild(newtext);
$("#p1").append("HI");
}
<div style="border: 1px solid red">
<p id="p1">First line of paragraph.<br /></p>
</div>
What is the difference between append() and appendChild()?
Any real time scenarios?

The main difference is that appendChild is a DOM method and append is a jQuery method. The second one uses the first as you can see on jQuery source code
append: function() {
return this.domManip(arguments, true, function( elem ) {
if ( this.nodeType === 1 || this.nodeType === 11 || this.nodeType === 9 ) {
this.appendChild( elem );
}
});
},
If you're using jQuery library on your project, you'll be safe always using append when adding elements to the page.

No longer
now append is a method in JavaScript
MDN documentation on append method
Quoting MDN
The ParentNode.append method inserts a set of Node objects or DOMString objects after the last child of the ParentNode. DOMString objects are inserted as equivalent Text nodes.
This is not supported by IE and Edge but supported by Chrome(54+), Firefox(49+) and Opera(39+).
The JavaScript's append is similar to jQuery's append.
You can pass multiple arguments.
var elm = document.getElementById('div1');
elm.append(document.createElement('p'),document.createElement('span'),document.createElement('div'));
console.log(elm.innerHTML);
<div id="div1"></div>

append is a jQuery method to append some content or HTML to an element.
$('#example').append('Some text or HTML');
appendChild is a pure DOM method for adding a child element.
document.getElementById('example').appendChild(newElement);

I know this is an old and answered question and I'm not looking for votes I just want to add an extra little thing that I think might help newcomers.
yes appendChild is a DOM method and append is JQuery method but practically the key difference is that appendChild takes a node as a parameter by that I mean if you want to add an empty paragraph to the DOM you need to create that p element first
var p = document.createElement('p')
then you can add it to the DOM whereas JQuery append creates that node for you and adds it to the DOM right away whether it's a text element or an html element
or a combination!
$('p').append('<span> I have been appended </span>');

appendChild is a DOM vanilla-js function.
append is a jQuery function.
They each have their own quirks.

The JavaScript appendchild method can be use to append an item to another element. The jQuery Append element does the same work but certainly in less number of lines:
Let us take an example to Append an item in a list:
a) With JavaScript
var n= document.createElement("LI"); // Create a <li> node
var tn = document.createTextNode("JavaScript"); // Create a text node
n.appendChild(tn); // Append the text to <li>
document.getElementById("myList").appendChild(n);
b) With jQuery
$("#myList").append("<li>jQuery</li>")

appendChild is a pure javascript method where as append is a jQuery method.

I thought there is some confusion here so I'm going to clarify it.
Both 'append' and 'appendChild' are now native Javascript functions and can be used concurrently.
For example:
let parent_div = document.querySelector('.hobbies');
let list_item = document.createElement('li');
list_item.style.color = 'red';
list_item.innerText = "Javascript added me here"
//running either one of these functions yield same result
const append_element = parent_div.append(list_item);
const append_child_element = parent_div.appendChild(list_item);
However, the key difference is the return value
e.g
console.log(append_element) //returns undefined
whereas,
console.log(append_child_element) // returns 'li' node
Hence, the return value of append_child method can be used to store it in a variable and use it later, whereas, append is use and throw (anonymous) function by nature.

Related

i want to insert element inside of a div and i want this element to be the first child [duplicate]

I have an element E and I'm appending some elements to it. All of a sudden, I find out that the next element to append should be the first child of E. What's the trick, how to do it? Method unshift doesn't work because E is an object, not array.
Long way would be to iterate through E's children and to move'em key++, but I'm sure that there is a prettier way.
var eElement; // some E DOM instance
var newFirstElement; //element which should be first in E
eElement.insertBefore(newFirstElement, eElement.firstChild);
2018 version - prepend
parent.prepend(newChild) // [newChild, child1, child2]
This is modern JS! It is more readable than previous options. It is currently available in Chrome, FF, and Opera.
The equivalent for adding to the end is append, replacing the old appendChild
parent.append(newChild) // [child1, child2, newChild]
Advanced usage
You can pass multiple values (or use spread operator ...).
Any string value will be added as a text element.
Examples:
parent.prepend(newChild, "foo") // [newChild, "foo", child1, child2]
const list = ["bar", newChild]
parent.append(...list, "fizz") // [child1, child2, "bar", newChild, "fizz"]
Related DOM methods
Read More - child.before and child.after
Read More - child.replaceWith
Mozilla Documentation
Can I Use
2017 version
You can use
targetElement.insertAdjacentElement('afterbegin', newFirstElement)
From MDN :
The insertAdjacentElement() method inserts a given element node at a given position relative to the element it is invoked upon.
position
A DOMString representing the position relative to the element; must be one of the following strings:
beforebegin: Before the element itself.
afterbegin: Just inside the element, before its first child.
beforeend: Just inside the element, after its last child.
afterend: After the element itself.
element
The element to be inserted into the tree.
In the family of insertAdjacent there is the sibling methods:
element.insertAdjacentHTML('afterbegin','htmlText')`
That can inject html string directly, like innerHTML but without override everything, so you can use it as a mini-template Engin and jump the oppressive process of document.createElement and even build a whole component with string manipulation process
element.insertAdjacentText for inject sanitize string into element . no more encode/decode
You can implement it directly i all your window html elements.
Like this :
HTMLElement.prototype.appendFirst = function(childNode) {
if (this.firstChild) {
this.insertBefore(childNode, this.firstChild);
}
else {
this.appendChild(childNode);
}
};
Accepted answer refactored into a function:
function prependChild(parentEle, newFirstChildEle) {
parentEle.insertBefore(newFirstChildEle, parentEle.firstChild)
}
Unless I have misunderstood:
$("e").prepend("<yourelem>Text</yourelem>");
Or
$("<yourelem>Text</yourelem>").prependTo("e");
Although it sounds like from your description that there is some condition attached, so
if (SomeCondition){
$("e").prepend("<yourelem>Text</yourelem>");
}
else{
$("e").append("<yourelem>Text</yourelem>");
}
I think you're looking for the .prepend function in jQuery. Example code:
$("#E").prepend("<p>Code goes here, yo!</p>");
I created this prototype to prepend elements to parent element.
Node.prototype.prependChild = function (child: Node) {
this.insertBefore(child, this.firstChild);
return this;
};
var newItem = document.createElement("LI"); // Create a <li> node
var textnode = document.createTextNode("Water"); // Create a text node
newItem.appendChild(textnode); // Append the text to <li>
var list = document.getElementById("myList"); // Get the <ul> element to insert a new node
list.insertBefore(newItem, list.childNodes[0]); // Insert <li> before the first child of <ul>
https://www.w3schools.com/jsref/met_node_insertbefore.asp

get content of some tags inside a variable

var a = $('#txta').val();
console.log(a);
result is complete html code from this url
Now I want to get content of all #artikal-naziv tags (there are 96)
var b = a.find("#artikal-naziv").text();
console.log(b);
Result:
Uncaught TypeError: a.find is not a function
Any help?
Actually you are calling .find() on a string and not in a DOM element.
Because from $('#txta').val() you are getting a string, that's why you got Uncaught TypeError: a.find is not a function, because string doesn't have .find() method.
You should change it to:
var a = $('#txta');
Then you can write:
var b = a.find("#artikal-naziv").text();
Note:
Now I want to get content of all #artikal-naziv tags (there are 96)
You can't set the same id #artikal-naziv for multiple elements (96), the id should be unique in the page.
Another thing .val() call assumes that your element is a form element, you can't call .val() on a div or a span, if it isn't a form element use .html() instead.
Because "a" is not a jQuery object - it's usually a string containing value of the returned element (txta).
Use $(a).find(...) instead - that will probably do it.
Ref link: https://stackoverflow.com/a/3532381/3704489
As per what I can make out of your description, you are getting HTML as string using var a = $('#txta').val();. If this is true, you will have to create an in-memory element and set this string as its HTML.
Then you will have an in-memory DOM section that you can query on.
You can try something like this:
var html = '<span><p id="artikal-naziv">bla bla</p></span>';
var $tempElement = $('<div>').html(html);
console.log($tempElement.find('#artikal-naziv').text());
// or using vanilla JS
var tempElement = document.createElement('div');
tempElement.innerHTML = html;
console.log(tempElement.querySelector('#artikal-naziv').textContent);
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.0.0/jquery.min.js"></script>
.val() takes out the value from the element....Whereas all DOM operations are done on the element... because function like .find() , .hide() , .show() , .closest() etc are used with the element not the value
The Following modifications should work...
var a = $('#txta'); // $("#ID") returns the element
console.log(a.val()); // $("#ID").val() returns the value
the result is complete html code from this URL
Now I want to get content of all #artikal-naziv tags (there are 96)
var b = a.find("#artikal-naziv").text(); // .find() easily works on element
console.log(b);
Simply use .find to find children and .closest to find parents:
<div class='a'>
<div class='b'>
<div class='c'></div>
<div class='c'></div>
<div class='c'></div>
</div>
</div>
js:
var a = $('.b');
a.find('.c'); // Will return all the objects with the class c
a.closest('.a'); // Will return the first parent with the class a

Value is undefined when element is obtained with jQuery

Below is the code where I obtain my input element with jQuery:
var txt = $(tableRow).find('input:text');
if (txt.value == null) {
//TO DO code
}
and here's how I do it with pure JavaScript
var txt = document.getElementById('txtAge');
if (txt.value == null) {
//TO DO code
}
With the first way the value of the txt is undefined. But with the second way the value is what's inside the input element. Now more interesting is, on the bottom-right pane of the Mozilla Firebug if I scroll down to the "value" of the txt I can see it there, both ways.
I know I can simply say $(txt).val(), but I also want to understand why I can't access the value of an element if it's been selected by jQuery. Isn't jQuery just a library of JavaScript functions?
.value is not part of the jquery api. You should use .val() instead:
var txt = $(tableRow).find('input:text');
if (txt.val() == "") {
//TO DO code
}
A dom object and a jquery dom object are not exactly the same. In fact, you can open the Developer tools (in webkit) or Firebug (Firefox) to check what are they in the inside. Jquery holds more information (actually, it contains an instance of the dom that it's representing). So, if you wanted to use .value, you need to call the "generic" dom object from the jquery object, and then use .value.
jQuery selects DOM elements using various native and non-native techniques and places them all in it’s own array-like instance that also wraps them in their own API. jQuery doesn’t "extend" native DOM properties or methods, so you will need to target the DOM node to do that.
Think of it like this:
var node = document.getElementById('txtAge'); // the DOM node
var txt = $('#txtAge'); // the same node wrapped in a jQuery object/API
Since jQuery object holds an array-like collection of DOM nodes, so you can access the first element by doing:
txt[0] // same as node
But it’s generally recommended that you use the .get() method:
txt.get(0)
Another more jQuery-way to do what you want is to iterate through a jQuery collection using .each():
$(tableRow).find('input:text').each(function() {
// "this" in the each callback is the DOM node
if ( this.value == null ) {
// Do something
}
});
.find() will return an arry-like object. If you're sure that there's one, and one only, element matching your query, you could do
var txt = $(tableRow).find('input:text')[0].value;
That's not very jQuery-like, so to speak, more like a mismatch of both jQuery and DOM methods, but it'll get what you want. Also, since you show, as a DOM example, var txt = document.getElementById('txtAge');, this could be rewritten in jQuery as
var txt = $('#txtAge')[0];
var x = $(tableRow).find('input:text');
It's an jquery object .
`x.value`
There is no property value in jquery object . So it returns undefined.
x.val() is a method you can use for get the value of an element.

JS DOM equivalent for JQuery append

What is the standard DOM equivalent for JQuery
element.append("<ul><li><a href='url'></li></ul>")?
I think you have to extend the innerHTML property to do this
element[0].innerHTML += "<ul><li><a href='url'></a></li></ul>";
some explanation:
[0] needed because element is a collection
+= extend the innerHTML and do not overwrite
closing </a> needed as some browsers only allow valid html to be set to innerHTML
Hint:
As #dontdownvoteme mentioned this will of course only target the first node of the collection element. But as is the nature of jQuery the collection could contain more entries
Proper and easiest way to replicate JQuery append method in pure JavaScript is with "insertAdjacentHTML"
var this_div = document.getElementById('your_element_id');
this_div.insertAdjacentHTML('beforeend','<b>Any Content</b>');
More Info - MDN insertAdjacentHTML
Use DOM manipulations, not HTML:
let element = document.getElementById('element');
let list = element.appendChild(document.createElement('ul'));
let item = list.appendChild(document.createElement('li'));
let link = item.appendChild(document.createElement('a'));
link.href = 'https://example.com/';
link.textContent = 'Hello, world';
<div id="element"></div>
This has the important advantage of not recreating the nodes of existing content, which would remove any event listeners attached to them, for example.
from the jQuery source code:
append: function() {
return this.domManip(arguments, true, function( elem ) {
if ( this.nodeType === 1 ) {
this.appendChild( elem ); //<====
}
});
},
Note that in order to make it work you need to construct the DOM element from the string, it's being done with jQuery domManip function.
jQuery 1.7.2 source code
element.innerHTML += "<ul><li><a href='url'></li></ul>";

How to set DOM element as first child?

I have an element E and I'm appending some elements to it. All of a sudden, I find out that the next element to append should be the first child of E. What's the trick, how to do it? Method unshift doesn't work because E is an object, not array.
Long way would be to iterate through E's children and to move'em key++, but I'm sure that there is a prettier way.
var eElement; // some E DOM instance
var newFirstElement; //element which should be first in E
eElement.insertBefore(newFirstElement, eElement.firstChild);
2018 version - prepend
parent.prepend(newChild) // [newChild, child1, child2]
This is modern JS! It is more readable than previous options. It is currently available in Chrome, FF, and Opera.
The equivalent for adding to the end is append, replacing the old appendChild
parent.append(newChild) // [child1, child2, newChild]
Advanced usage
You can pass multiple values (or use spread operator ...).
Any string value will be added as a text element.
Examples:
parent.prepend(newChild, "foo") // [newChild, "foo", child1, child2]
const list = ["bar", newChild]
parent.append(...list, "fizz") // [child1, child2, "bar", newChild, "fizz"]
Related DOM methods
Read More - child.before and child.after
Read More - child.replaceWith
Mozilla Documentation
Can I Use
2017 version
You can use
targetElement.insertAdjacentElement('afterbegin', newFirstElement)
From MDN :
The insertAdjacentElement() method inserts a given element node at a given position relative to the element it is invoked upon.
position
A DOMString representing the position relative to the element; must be one of the following strings:
beforebegin: Before the element itself.
afterbegin: Just inside the element, before its first child.
beforeend: Just inside the element, after its last child.
afterend: After the element itself.
element
The element to be inserted into the tree.
In the family of insertAdjacent there is the sibling methods:
element.insertAdjacentHTML('afterbegin','htmlText')`
That can inject html string directly, like innerHTML but without override everything, so you can use it as a mini-template Engin and jump the oppressive process of document.createElement and even build a whole component with string manipulation process
element.insertAdjacentText for inject sanitize string into element . no more encode/decode
You can implement it directly i all your window html elements.
Like this :
HTMLElement.prototype.appendFirst = function(childNode) {
if (this.firstChild) {
this.insertBefore(childNode, this.firstChild);
}
else {
this.appendChild(childNode);
}
};
Accepted answer refactored into a function:
function prependChild(parentEle, newFirstChildEle) {
parentEle.insertBefore(newFirstChildEle, parentEle.firstChild)
}
Unless I have misunderstood:
$("e").prepend("<yourelem>Text</yourelem>");
Or
$("<yourelem>Text</yourelem>").prependTo("e");
Although it sounds like from your description that there is some condition attached, so
if (SomeCondition){
$("e").prepend("<yourelem>Text</yourelem>");
}
else{
$("e").append("<yourelem>Text</yourelem>");
}
I think you're looking for the .prepend function in jQuery. Example code:
$("#E").prepend("<p>Code goes here, yo!</p>");
I created this prototype to prepend elements to parent element.
Node.prototype.prependChild = function (child: Node) {
this.insertBefore(child, this.firstChild);
return this;
};
var newItem = document.createElement("LI"); // Create a <li> node
var textnode = document.createTextNode("Water"); // Create a text node
newItem.appendChild(textnode); // Append the text to <li>
var list = document.getElementById("myList"); // Get the <ul> element to insert a new node
list.insertBefore(newItem, list.childNodes[0]); // Insert <li> before the first child of <ul>
https://www.w3schools.com/jsref/met_node_insertbefore.asp

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