Html element name and id

Id and Name attribute html example

While designing modern responsive webpage, we often set id for html element (sometimes we use css class name too) , id can be further used in writing JavaScript jquery program, where we can dynamically set behaviour of that html element calling by unique html id.

We can select any html element by id, name or css class name, Let’s learn about html Id and name attribute, how to define and use those element property in coding!

// select by id $("#btnShow").click(function () < >); // select by class name $(".btnShow").click(function () < >);

Use Id and name attribute of html element

The id attribute specifies a unique id for an HTML element; the id value must be unique within the HTML document. So if we want to find that element by id, it should return one element.

 // get element by id var btn=document.getElementById("btn1"); // get element by name var btn1=document.getElementByName("btn1");

In CSS we define the id with # hashtag, and in html we set that id.
Let’s look at the example below

 #dvMessage 
Welcome to WebTrainingRoom
 

We can use id attribute on any HTML element, remember that the id value is always case-sensitive, id value should be unique and not blank.

html id attribute vs name attribute

ID is not same as Class in Css, there are some difference between Class and ID.

Let’s understand the difference with example

 #dvMessage < background-color: #000; color: #fff; padding: 10px; text-align: center; >.studentName 
Welcome to WebTrainingRoom
 
Arundhuti
 
Gargi
 
Anshuman
 

Now if you notice in above example, same class name can be repeated, but id value will be unique in current document

In javascript we can get this element by id, in DOM there is in-built method “getElementsById”

Learn name attribute in HTML

we can define a name of any html control and then access that control with name.
Let’s look at example

html class vs id

Here i will give another example of html class vs id using jquery, you will see how differently it works when we are selecting any html element by Id and selecting any html element by css class name.

In below example we access a html button by id and by class name. suppose we have a button with id «btnShow»

Remember id is always unique, means you can have only one element with that id on same page.

But you can have multiple elements with same css class name

Html id is very useful for setting dynamic behaviour of any html control in webpage; we can select any html element by id in jquery function.

Источник

A guide on HTML name vs id attribute

Posted on Aug 06, 2021

Although both name and id attributes are used to add identifiers to your HTML tags, the two attributes have different purposes for their existence.

This tutorial will help you learn about their differences.

The purpose of the name attribute

The name attribute is an identifier attribute that’s used for sending data through the HTML form elements.

For example, consider the HTML form as shown below:

The HTML form above intends to capture the user input for username and password, but since both elements don’t have the name attribute attached to them, the browser won’t send anything when the submit button is clicked.

Submitting the form using the GET method will generate the following URL:

 Now let’s add the name attribute to both elements as shown below:

 The same process also applies to an HTML form that uses the POST method.
 
Without the name attribute, any value you have in the HTML form element such as , , or element will be excluded from the form submission.
 
The purpose of the id attribute
 
The id attribute is a unique identifier for HTML tags meant to single out the element when rendered on the browser.
 
The element using the id attribute usually has a unique styling attached so that it stands out from the rest.
 
 element where the first item is colored red. This is one example of how you can create the element:
 
 
You can then create a CSS rule for the id using the hash ( # ) selector as follows:
 
Having two or more elements with the same id attribute value in one page is considered invalid, but you won’t receive any error because browsers are made to be fault-tolerant when it comes to rendering HTML.
 
In the past, the rule for CSS styling is that unique styles are applied to the id while general styles are applied to the class .
 
But since modern CSS practice tends to style everything using class – especially utility first CSS framework like Tailwind – the id attribute is now mostly used to associate the tag with an input element.
 
id attribute for labels
 
The id attribute in form elements can be used to associate a tag with a specific input element.
 
For example, consider the following HTML form code:
 

When you click on the label from the browser, you will automatically shift the browser focus to the element:
Without the for or the id attribute, the browser will do nothing when you click on the element. The same rule apply to other input elements like and .
Now you’ve learned the difference between the name and the id attribute. Nice work 😉
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Источник
What is the Difference Between the "id" and "name" Attributes
If you have a situation when you must decide whether to use the HTML id or name attribute, then you are in the right place.
In this snippet, we’re going to discuss the differences between the id and name attributes, after which you’ll make a better decision of their usage.
Let’s discuss them separately and then you can see an example.
The id Attribute
The id attribute is a unique identifier of the HTML element. Each id attribute must be unique. Also, this attribute must begin with a letter and is case sensitive. It can be used as an anchor reference in URL. It isn’t associated with the data within the element.
In CSS, the id attribute is referenced with the # character. In Javascript, it is referenced with getElementById().
The name Attribute
The name attribute defines a name of the element. It is used in the HTTP request that is sent to the server as a variable name by the browser. This attribute is associated with the data within the element.
Like the id attribute, the name attribute must begin with a letter and is case sensitive, but unlike the id attribute, it can be not unique.
The name attribute cannot be referenced in CSS. In Javascript, it is referenced with getElementsByName().
This attribute is valid only on the following elements: , , , , , , , , , , , and .
Example of the id and name attributes:
html> html> head> title>Title of the document title> head> body> h1>Radio Buttons h1> form action="/form/submit" method="post"> p>Select your gender: p> input type="radio" id="male" name="gender" value="male"> label for="male">Male label>br> input type="radio" id="female" name="gender" value="female"> label for="female">Female label>br> input type="radio" id="other" name="gender" value="other"> label for="other">Other label> br> p>Select your age: p> input type="radio" id="age1" name="age" value="30"> label for="age1">0 - 25 label>br> input type="radio" id="age2" name="age" value="60"> label for="age2">25 - 50 label>br> input type="radio" id="age3" name="age" value="100"> label for="age3">50 - 80 label>br>br> input type="submit" value="Submit"> form> body> html>
 
Conclusion:
 
The "id" and "name" attributes are both used to identify elements in HTML, but they serve different purposes.
 
The "id" attribute is used to uniquely identify an element on a web page. It is often used by developers to manipulate the element with JavaScript or to create links to the element within the same page or other pages. The "id" attribute can only be used once per page, as it is intended to provide a unique identifier for that specific element.
 
The "name" attribute, on the other hand, is used to identify form elements and is often used to submit data to the server. For example, a text input field in a form will have a "name" attribute that corresponds to the name of the data that will be submitted to the server when the form is submitted.
 
Both "id" and "name" attributes are used in the DOM tree, but for different purposes. The "id" attribute is used to reference an element in the DOM tree, while the "name" attribute is used to identify form elements within the DOM tree.
 
In some cases, the "id" and "name" attributes may have overlapping uses, but they are intended to serve different purposes. It's important to use them correctly to ensure that your web page functions properly and is accessible to all users.
 
Источник
 
HTML id Attribute
 
The HTML id attribute is used to specify a unique id for an HTML element.
 
You cannot have more than one element with the same id in an HTML document.
 
Using The id Attribute
 
The id attribute specifies a unique id for an HTML element. The value of the id attribute must be unique within the HTML document.
 
The id attribute is used to point to a specific style declaration in a style sheet. It is also used by JavaScript to access and manipulate the element with the specific id.
 
The syntax for id is: write a hash character (#), followed by an id name. Then, define the CSS properties within curly braces <>.
 
In the following example we have an element that points to the id name "myHeader". This element will be styled according to the #myHeader style definition in the head section:
 
Example
 
Note: The id name is case sensitive!
 
Note: The id name must contain at least one character, cannot start with a number, and must not contain whitespaces (spaces, tabs, etc.).
 
Difference Between Class and ID
 
A class name can be used by multiple HTML elements, while an id name must only be used by one HTML element within the page:
 
Example
 
 
/* Style all elements with the class name "city" */
.city background-color: tomato; 
color: white; 
padding: 10px;
> 
 
 
 
London is the capital of England.
 
Paris is the capital of France.
 
Tokyo is the capital of Japan.
 
 
Tip: You can learn much more about CSS in our CSS Tutorial.
 
HTML Bookmarks with ID and Links
 
HTML bookmarks are used to allow readers to jump to specific parts of a webpage.
 
Bookmarks can be useful if your page is very long.
 
To use a bookmark, you must first create it, and then add a link to it.
 
Then, when the link is clicked, the page will scroll to the location with the bookmark.
 
Example
 
First, create a bookmark with the id attribute:
 
Then, add a link to the bookmark ("Jump to Chapter 4"), from within the same page:
 
Example
 
Or, add a link to the bookmark ("Jump to Chapter 4"), from another page:
 
Using The id Attribute in JavaScript
 
The id attribute can also be used by JavaScript to perform some tasks for that specific element.
 
JavaScript can access an element with a specific id with the getElementById() method:
 
Example
 
Use the id attribute to manipulate text with JavaScript:
 
Tip: Study JavaScript in the HTML JavaScript chapter, or in our JavaScript Tutorial.
 
Chapter Summary
 
 
The id attribute is used to specify a unique id for an HTML element
 
The value of the id attribute must be unique within the HTML document
 
The id attribute is used by CSS and JavaScript to style/select a specific element
 
The value of the id attribute is case sensitive
 
The id attribute is also used to create HTML bookmarks
 
JavaScript can access an element with a specific id with the getElementById() method
 
 
Источник