Get and Replace HTML content with innerHTML

innerHTML is a JavaScript property that can be used to get the HTML content added into a HTML element in web page, and also it can be used to replace the content into a HTML element with other content.


1. Syntax, get content with innerHTML:
var content = element.innerHTML;
- Example, adds the content of a Div in a textarea:
<div id='id1'>JavaScript
 <p>Example innerHTML - https://coursesweb.net/javascript/</p>
</div>
<p>If you click on the following button, it adds in textarea the content of the HTML element with id 'id1'.</p>
<button id='btn1'>Try it</button><br>
<textarea id='txta' cols='40' rows=4'></textarea>

<script>
var txta = document.getElementById('txta');

document.getElementById('btn1').addEventListener('click', (ev)=>{
 var cnt = document.getElementById('id1').innerHTML;
 txta.value = cnt;
});
</script>
2. Syntax, add /replace content with innerHTML:
element.innerHTML = 'HTML content';
- Example, replaces the content of a Div:
<div id='id1'>Div - JavaScript</div>
<p>If you click on the following button, it replaces the content of the Div above.</p>
<button id='btn1'>Try it</button>

<script>
document.getElementById('btn1').addEventListener('click', (ev)=>{
 document.getElementById('id1').innerHTML ='<p>Example innerHTML - https://coursesweb.net/javascript</p>';
});
</script>

Get and Replace HTML content with outerHTML

outerHTML is a JavaScript property that can be used to get the string with a HTML element, including its tag, attributes and child elements, also it can replace a HTML tag (including its content) with other HTML content.


1. Syntax, get HTML content with outerHTML:
var content = element.outerHTML;

The difference between innerHTML and outerHTML is that the innerHTML gets the content added into a HTML element, but the outerHTML gets also the tag and attributes representing that element.


- Example, adds the string with a HTML element in a textarea:
<div id='id1'>JavaScript
 <p>Example outerHTML - CoursesWeb.net/javascript</p>
</div>
<p>If you click on the following button, it adds in textarea the HTML element with id 'id1'.</p>
<button id='btn1'>Try it</button><br>
<textarea id='txta' cols='40' rows=4'></textarea>

<script>
var txta = document.getElementById('txta');

document.getElementById('btn1').addEventListener('click', (ev)=>{
 var cnt = document.getElementById('id1').outerHTML;
 txta.value = cnt;
});
</script>
2. Syntax, add /replace content with outerHTML:
element.outerHTML = 'HTML content';

The difference between outerHTML and innerHTML is that outerHTML replace the element itself with the new content.


- Example, replaces a Div with another HTML tag:
<div id='id1'>Div
 <div id='id2'>JavaScript</div>
</div>
<p>If you click on the following button, it replaces the the Div above with a H4 element.</p>
<button id='btn1'>Try it</button>

<script>
document.getElementById('btn1').addEventListener('click', (ev)=>{
 document.getElementById('id1').outerHTML ='<h4>Example outerHTML - https://coursesweb.net/javascript</h4>';
});
</script>

Daily Test with Code Example

HTML
CSS
JavaScript
PHP-MySQL
Which tag is used to add lists into <ul> and <ol> elements?
<dt> <dd> <li>
<ul>
 <li>http://coursesweb.net/html/</li>
 <li>http://coursesweb.net/css/</li>
</ul>
Which value of the "display" property creates a block box for the content and ads a bullet marker?
block list-item inline-block
.some_class {
  display: list-item;
}
Which instruction converts a JavaScript object into a JSON string.
JSON.parse() JSON.stringify eval()
var obj = {
 "courses": ["php", "javascript", "ajax"]
};
var jsonstr = JSON.stringify(obj);
alert(jsonstr);    // {"courses":["php","javascript","ajax"]}
Indicate the PHP class used to work with HTML and XML content in PHP.
stdClass PDO DOMDocument
$strhtml = '<body><div id="dv1">CoursesWeb.net</div></body>';
$dochtml = new DOMDocument();
$dochtml->loadHTML($strhtml);
$elm = $dochtml->getElementById("dv1");
echo $elm->nodeValue;    // CoursesWeb.net
innerHTML and outerHTML to Get and Replace HTML content

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