What is the difference between the id and name attributes? They both seem to serve the same purpose of providing an identifier.
I would like to know (specifically with regards to HTML forms) whether or not using both is necessary or encouraged for any reasons.
The name attribute is used when sending data in a form submission. Different controls respond differently. For example, you may have several radio buttons with different id attributes, but the same name. When submitted, there is just the one value in the response - the radio button you selected.
Of course, there's more to it than that, but it will definitely get you thinking in the right direction.
id is what your frontend (CSS, JS) works with, while name is what your server receives and can then process. This is basically what Greeso's answer says. –
Holman Use name attributes for form controls (such as <input> and <select>), as that's the identifier used in the POST or GET call that happens on form submission.
Use id attributes whenever you need to address a particular HTML element with CSS, JavaScript or a fragment identifier. It's possible to look up elements by name, too, but it's simpler and more reliable to look them up by ID.
name and id at all. The identifier uniquely identifies a particular HTML element on the page. The name attribute of an HTML form element, by contrast, does not have to be unique, and often isn't, such as with radio buttons or pages with multiple <form> elements. It is traditional to use the same string for name and id where both are used on a single HTML element, but nothing makes you do this. –
Biblio id is used to identify the HTML element through the Document
Object Model (via JavaScript or styled with CSS). id is expected
to be unique within the page.
name corresponds to the form element and identifies what is posted
back to the server.
The way I think about it and use it is simple:
id is used for CSS and JavaScript/jQuery (it has to be unique on a page).
name is used for form handling on the server when a form is submitted via HTML (it has to be unique in a form - to some extent, see Paul's comment below).
See id= vs name=:
What’s the difference? The short answer is, use both and don’t worry about it. But if you want to understand this goofiness, here’s the skinny:
id= is for use as a target like this:
<some-element id="XXX"></some-element>for links like this:<a href="#XXX".
name= is also used to label the fields in the message send to a server with an HTTP (HyperText Transfer Protocol) GET or POST when you hit submit in a form.
id= labels the fields for use by JavaScript and Java DOM (Document Object Model). The names in name= must be unique within a form. The names in id= must be unique within the entire document.
Sometimes the name= and id= names will differ, because the server is expecting the same name from various forms in the same document or various radio buttons in the same form as in the example above. The id= must be unique; the name= must not be.
JavaScript needed unique names, but there were too many documents already out here without unique name= names, so the W3 people invented the id tag that was required to be unique. Unfortunately older browsers did not understand it. So you need both naming schemes in your forms.
Note: attribute "name" for some tags like <a> is not supported in HTML5.
name is important for <input> tags in a <form> submission as the parameters are used in the HTTP, and id is merely a unique identifier –
Nehru The ID tag - used by CSS, define a unique instance of a div, span or other elements. Appears within the JavaScript DOM model, allowing you to access them with various function calls.
The Name tag for fields - this is unique per form -- unless you are doing an array which you want to pass to PHP/server-side processing. You can access it via JavaScript by name, but I think that it does not appear as a node in the DOM or some restrictions may apply (you cannot use .innerHTML, for example, if I recall correctly).
Generally, it is assumed that name is always superseded by id. This is true, to some extent, but not for form fields and frame names, practically speaking. For example, with form elements, the name attribute is used to determine the name-value pairs to be sent to a server-side program and should not be eliminated. Browsers do not use id in that manner. To be on the safe side, you could use the name and id attributes on form elements. So, we would write the following:
<form id="myForm" name="myForm">
<input type="text" id="userName" name="userName" />
</form>
To ensure compatibility, having matching name and id attribute values when both are defined is a good idea. However, be careful—some tags, particularly radio buttons, must have nonunique name values, but require unique id values.
Once again, this should reference that id is not simply a replacement for name; they are different in purpose. Furthermore, do not discount the old-style approach, a deep look at modern libraries shows such syntax style used for performance and ease purposes at times. Your goal should always be in favor of compatibility.
Now in most elements, the name attribute has been deprecated in favor of the more ubiquitous id attribute. However, in some cases, particularly form fields (<button>, <input>, <select>, and <textarea>), the name attribute lives on, because it continues to be required to set the name-value pair for form submission. Also, we find that some elements, notably frames and links, may continue to use the name attribute, because it is often useful for retrieving these elements by name.
There is a clear distinction between id and name. Very often when name continues on, we can set the values the same. However, id must be unique, and name in some cases shouldn’t—think radio buttons. Sadly, the uniqueness of id values, while caught by markup validation, is not as consistent as it should be. CSS implementation in browsers will style objects that share an id value; thus, we may not catch markup or style errors that could affect our JavaScript until runtime.
This is taken from the book JavaScript - The Complete Reference by Thomas-Powell.
name should be the same (the server-side code doesn't care which was submitted), but the id must be different (because it must be unique within the whole page). –
Misconceive <form action="demo_form.asp">
<label for="male">Male</label>
<input type="radio" name="sex" id="male" value="male"><br>
<label for="female">Female</label>
<input type="radio" name="sex" id="female" value="female"><br>
<input type="submit" value="Submit">
</form>
name
<button>, <form>, <fieldset>, <iframe>,
<input>, <keygen>, <object>, <output>, <select>, <textarea>, <map>,
<meta>, and <param>name attributes used in style elements. I assume this is invalid? –
Aminoplast <body>
<form action="">
<label for="username">Username</label>
<input type="text" id="username" name="username">
<button>Submit!</button>
</form>
</body>As we can see here, "id" and "for" elements are interconnected. If you click on the label (Username) then the input field will be highlighted (this is useful for mobile users and is considered as a good practice).
On the other hand, the "name" element is useful while submitting the form. Whatever you enter in the input field it will be displayed on the URL. Please see the attached image.
The forum thread below has answers to the same basic question, but basically, id is used for scripting identification and name is for server-side.
name is deprecated for link targets, and invalid in HTML5. It no longer works at least in the latest Firefox (v13). Change <a name="hello"> to <a id="hello">.
The target does not need to be an <a> tag. It can be <p id="hello"> or <h2 id="hello">, etc. which is often cleaner code.
As other posts say clearly, name is still used (needed) in forms. It is also still used in META tags.
a tag name attribute is deprecated, it is still supported by browsers including Firefox, so the answer is incorrect. Yes, for an anchor (target location) you should now use id on the element (<h2 id="hello">), but this wasn't really what the OP was asking. –
Sunnysunproof The ID of a form input element has nothing to do with the data contained within the element. IDs are for hooking the element with JavaScript and CSS. The name attribute, however, is used in the HTTP request sent by your browser to the server as a variable name associated with the data contained in the value attribute.
For instance:
<form>
<input type="text" name="user" value="bob">
<input type="password" name="password" value="abcd1234">
</form>
When the form is submitted, the form data will be included in the HTTP header like this:
If you add an ID attribute, it will not change anything in the HTTP header. It will just make it easier to hook it with CSS and JavaScript.
ID is used to uniquely identify an element.
Name is used in forms. Although you submit a form, if you don’t give any name, nothing will will be submitted. Hence form elements need a name to get identified by form methods like "get or push".
And only the ones with the name attribute will go out.
If you're not using the form's own submit method to send information to a server (and are instead doing it using JavaScript) you can use the name attribute to attach extra information to an input - rather like pairing it with a hidden input value, but it looks neater because it's incorporated into the input.
This bit does still currently work in Firefox although I suppose in the future it might not get allowed through.
You can have multiple input fields with the same name value, as long as you aren't planning to submit the old fashioned way.
Id:
Name corresponds to the form element and identifies what is posted back to the server.
Example:
<form action="action_page.php" id="Myform">
First name: <input type="text" name="FirstName"><br>
<input type="submit" value="Submit">
</form>
<p>The "Last name" field below is outside the form element, but still part of the form.</p>
Last name: <input type="text" name="LastName" form="Myform">
In all the time this question has been around, I am chagrined (and perhaps a bit saddened) that nobody has thought to mention accessibility which, though always important, has been steadily gaining support amongst both management and software engineers (just from my personal observations; no hard data to back that up).
One statistic I can provide is this (source):
So awareness of accessibility shortcomings show a steadily growing trend. The same reference mentions that, from those numbers, one can observe that at least one lawsuit is filed every hour!
So how does accessibility weigh in on name vs id?
According to the World Wide Web Consortium (W3C):
The
forattribute of the label must exactly match theidof the form control.
Based on personal experiences and according to the W3Schools description for attributes:
ID is a global attribute and applies to virtually all elements in HTML. It is used to uniquely identify elements on the Web page, and its value is mostly accessed from the frontend (typically through JavaScript or jQuery).
name is an attribute that is useful to specific elements (such as form elements, etc.) in HTML. Its value is mostly sent to the backend for processing.
There is no literal difference between an id and name.
name is an identifier and is used in the HTTP request sent by the browser to serve as a variable name associated with data contained in the value attribute of the element.
The id on the other hand is a unique identifier for browser, client side and JavaScript. Hence the form needs an id while its elements need a name.
id is more specifically used in adding attributes to unique elements. In DOM methods, Id is used in JavaScript for referencing the specific element you want your action to take place on.
For example:
<html>
<body>
<h1 id="demo"></h1>
<script>
document.getElementById("demo").innerHTML = "Hello World!";
</script>
</body>
</html>
Same can be achieved by name attribute, but it's preferred to use id in a form and name for small form elements like the input tag or select tag.
Below is an interesting use of the id attribute. It is used within the <form> tag and used to identify the form for <input> elements outside of the </form> boundaries so that they will be included with the other <input> fields within the form.
<form action="action_page.php" id="form1">
First name: <input type="text" name="fname"><br>
<input type="submit" value="Submit">
</form>
<p>The "Last name" field below is outside the form element, but still part of the form.</p>
Last name: <input type="text" name="lname" form="form1">
Both name and id is targetable by # so not sure why ID was mentioned for this task exclusively.
I often Inspect those attributes to create specific links to bookmark (where clicking on header with mouse cursor to do the same is not provided for some reason) such as the Option File Inclusions section of MySQL 5.6 4.2.2.2 Using Option Files documentation:
https://dev.mysql.com/doc/refman/5.6/en/option-files.html#option-file-inclusions
where it's defined as <a name="option-file-inclusions"></a> (with absolutely no forms involved).
I think, the name attribute is also older than id in HTML.
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