Get all classes in html

Get All Classes of HTML Element jQuery

In this tutorial we will see how to Get All Classes of HTML Element with jQuery. The jQuery attr() method or HTML DOM Element classList Property can be used to get a list of all classes of HTML element.

jQuery attr() Method

jQuery attr() Method is used to set or get the attributes and values of the selected HTML element

In this example attr() Method is used to get the names of all classes of the targeted HTML element.

classList Property

HTML DOM Element classList Property return the names of all classes of HTML element.

In this case, classList Property is used to get the names of all classes of the targeted HTML element.

We can use anyone of them, either jQuery attr() Method or HTML DOM Element classList Property to get all classes of HTML tag.

HTML Code

HTML Code is given below, This code has one paragraph element with three classes and a button tag.

I have three Classes!
 Get All Classes 

JQuery Code

JQuery Code is given below, In this code jQuery attr() Method is used to get all classes of HTML element on click of a button.

Click event is attached with the HTML button using jQuery click() method.

Take a look at the code given below.

Same code with HTML DOM Element classList Property.

Note: [0] is used to convert jQuery element to HTML element.

Demo

Video Tutorial

Watch video tutorial on How To Get All Classes of HTML Element in jQuery.

Источник

Get All Classes from HTML File: 5 Techniques for Easy Extraction

Learn how to extract all classes from an HTML file using 5 different techniques, including querySelectorAll in JavaScript, HTML Parser tool, PHP, jQuery, and getElementsByClassName method. Save time and effort with these easy extraction methods.

• Using querySelectorAll in JavaScript
• Using a tool to extract a list of classes
• Using PHP to get all classes from an HTML file
• Using jQuery to get all classes of an element
• Using getElementsByClassName and querySelectorAll in JavaScript
• Other Code Examples for Extracting All Classes from HTML File
• Conclusion
• How do I find classes in HTML?
• How do you list multiple classes in HTML?
• How do you find all the classes of an element?
• How do I get all elements in a HTML document?

If you’re a web developer, you know that getting a list of all classes used in an HTML file can be a time-consuming and tedious process. Fortunately, there are several ways to get a list of all classes, including using JavaScript, PHP, or a tool that can extract a list of classes in the HTML file. In this blog post, we’ll explore how to get all classes from an HTML file using various techniques.

Using querySelectorAll in JavaScript

One way to get all classes from an HTML file is by using the queryselectorall method in javascript . This method returns a list of all elements in the document that match a specified CSS selector. Here’s an example code snippet:

const elements = document.querySelectorAll('*'); const classes = []; elements.forEach(e => < const elementClasses = e.classList; elementClasses.forEach(c => < if (!classes.includes(c)) < classes.push(c); >>); >); console.log(classes); 

In the above code, we use the querySelectorAll method to select all elements in the document. We then loop through each element and get its class list. We add each class to an array if it hasn’t already been added. Finally, we log the array of classes to the console.

Using a tool to extract a list of classes

Another way to get all classes from an HTML file is by using a tool that can extract a list of classes in the HTML file. One such tool is the HTML Parser tool. Here’s an example code snippet:

const html = fs.readFileSync('index.html', 'utf8'); const parser = new htmlparser.Parser( < onopentag: function(tagname, attribs)< if(tagname === "div" && attribs.class)< console.log(attribs.class); >>, onend: function() < console.log("Finished parsing the HTML"); >>); parser.write(html); parser.end(); 

In the above code, we use the HTML Parser tool to extract all div elements with a class attribute. We then log each class to the console.

Using PHP to get all classes from an HTML file

PHP can also be used to get all classes from an HTML file. The DOMXPath class can be used to query an HTML document and extract all class attributes. Here’s an example code snippet:

$html = file_get_contents('index.html'); $doc = new DOMDocument(); $doc->loadHTML($html); $xpath = new DOMXPath($doc); $classes = $xpath->query('//*/@class'); foreach ($classes as $class) < echo $class->nodeValue . "\n"; > 

In the above code, we use the DOMXPath class to query an HTML document and extract all class attributes. We then loop through each class and log it to the console.

Using jQuery to get all classes of an element

jQuery can be used to get all classes of an element. The attr() method can be used to get the value of the class attribute, which is then split into an array of classes. Here’s an example code snippet:

const classes = $('body').attr('class').split(/\s+/); console.log(classes); 

In the above code, we use the attr() method to get the value of the class attribute of the body element. We then split the value into an array of classes and log it to the console.

Using getElementsByClassName and querySelectorAll in JavaScript

Finally, we can use the getElementsByClassName() and querySelectorAll() methods in JavaScript to get all classes of an element. Here’s an example code snippet:

const elements = document.querySelectorAll('.my-class'); elements.forEach(e => console.log(e.classList)); 

In the above code, we use the querySelectorAll() method to select all elements with a class of my-class . We then loop through each element and log its class list to the console.

Other Code Examples for Extracting All Classes from HTML File

In Html as proof, get all classes in a html file code example

var lst=[]; document.querySelectorAll("[class]").forEach( (e)=>< e.getAttribute("class").split(" ").forEach( (cls)=>0 && lst.indexOf(cls) <0) lst.push(cls);>); >); console.log(lst.sort());

In Html as proof, get all classes from html file code example

var lst=[]; document.querySelectorAll("[class]").forEach( (e)=>< e.getAttribute("class").split(" ").forEach( (cls)=>0 && lst.indexOf(cls) <0) lst.push(cls);>); >); console.log(lst.sort()); 

Conclusion

In conclusion, getting all classes from an HTML file can be done using various techniques, such as using JavaScript, PHP, or a tool that can extract a list of classes. Each technique has its advantages and disadvantages, so it’s important to choose the right one based on the specific use case. By using the techniques outlined in this blog post, developers can save time and effort in extracting all classes from an HTML file.

Источник

Get All Classes from HTML File: 5 Techniques for Easy Extraction

Learn how to extract all classes from an HTML file using 5 different techniques, including querySelectorAll in JavaScript, HTML Parser tool, PHP, jQuery, and getElementsByClassName method. Save time and effort with these easy extraction methods.

• Using querySelectorAll in JavaScript
• Using a tool to extract a list of classes
• Using PHP to get all classes from an HTML file
• Using jQuery to get all classes of an element
• Using getElementsByClassName and querySelectorAll in JavaScript
• Other Code Examples for Extracting All Classes from HTML File
• Conclusion
• How do I find classes in HTML?
• How do you list multiple classes in HTML?
• How do you find all the classes of an element?
• How do I get all elements in a HTML document?

If you’re a web developer, you know that getting a list of all classes used in an HTML file can be a time-consuming and tedious process. Fortunately, there are several ways to get a list of all classes, including using JavaScript, PHP, or a tool that can extract a list of classes in the HTML file. In this blog post, we’ll explore how to get all classes from an HTML file using various techniques.

Using querySelectorAll in JavaScript

One way to get all classes from an HTML file is by using the queryselectorall method in javascript . This method returns a list of all elements in the document that match a specified CSS selector. Here’s an example code snippet:

const elements = document.querySelectorAll('*'); const classes = []; elements.forEach(e => < const elementClasses = e.classList; elementClasses.forEach(c => < if (!classes.includes(c)) < classes.push(c); >>); >); console.log(classes); 

In the above code, we use the querySelectorAll method to select all elements in the document. We then loop through each element and get its class list. We add each class to an array if it hasn’t already been added. Finally, we log the array of classes to the console.

Using a tool to extract a list of classes

Another way to get all classes from an HTML file is by using a tool that can extract a list of classes in the HTML file. One such tool is the HTML Parser tool. Here’s an example code snippet:

const html = fs.readFileSync('index.html', 'utf8'); const parser = new htmlparser.Parser( < onopentag: function(tagname, attribs)< if(tagname === "div" && attribs.class)< console.log(attribs.class); >>, onend: function() < console.log("Finished parsing the HTML"); >>); parser.write(html); parser.end(); 

In the above code, we use the HTML Parser tool to extract all div elements with a class attribute. We then log each class to the console.

Using PHP to get all classes from an HTML file

PHP can also be used to get all classes from an HTML file. The DOMXPath class can be used to query an HTML document and extract all class attributes. Here’s an example code snippet:

$html = file_get_contents('index.html'); $doc = new DOMDocument(); $doc->loadHTML($html); $xpath = new DOMXPath($doc); $classes = $xpath->query('//*/@class'); foreach ($classes as $class) < echo $class->nodeValue . "\n"; > 

In the above code, we use the DOMXPath class to query an HTML document and extract all class attributes. We then loop through each class and log it to the console.

Using jQuery to get all classes of an element

jQuery can be used to get all classes of an element. The attr() method can be used to get the value of the class attribute, which is then split into an array of classes. Here’s an example code snippet:

const classes = $('body').attr('class').split(/\s+/); console.log(classes); 

In the above code, we use the attr() method to get the value of the class attribute of the body element. We then split the value into an array of classes and log it to the console.

Using getElementsByClassName and querySelectorAll in JavaScript

Finally, we can use the getElementsByClassName() and querySelectorAll() methods in JavaScript to get all classes of an element. Here’s an example code snippet:

const elements = document.querySelectorAll('.my-class'); elements.forEach(e => console.log(e.classList)); 

In the above code, we use the querySelectorAll() method to select all elements with a class of my-class . We then loop through each element and log its class list to the console.

Other Code Examples for Extracting All Classes from HTML File

In Html as proof, get all classes in a html file code example

var lst=[]; document.querySelectorAll("[class]").forEach( (e)=>< e.getAttribute("class").split(" ").forEach( (cls)=>0 && lst.indexOf(cls) <0) lst.push(cls);>); >); console.log(lst.sort());

In Html as proof, get all classes from html file code example

var lst=[]; document.querySelectorAll("[class]").forEach( (e)=>< e.getAttribute("class").split(" ").forEach( (cls)=>0 && lst.indexOf(cls) <0) lst.push(cls);>); >); console.log(lst.sort()); 

Conclusion

In conclusion, getting all classes from an HTML file can be done using various techniques, such as using JavaScript, PHP, or a tool that can extract a list of classes. Each technique has its advantages and disadvantages, so it’s important to choose the right one based on the specific use case. By using the techniques outlined in this blog post, developers can save time and effort in extracting all classes from an HTML file.

Источник