value - Difference between id and name attributes in HTML




which statement about the name and id attributes of form fields is false? (13)

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.


Here is a brief summary:

  • 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.


name Vs id

name

  • Name of the element. For example used by the server to identify the fields in form submits.
  • Supporting elements are <button>, <form>, <fieldset>, <iframe>, <input>, <keygen>, <object>, <output>, <select>, <textarea>, <map>, <meta>, <param>
  • Name does not have to be unique.

id

  • Often used with CSS to style a specific element. The value of this attribute must be unique.
  • Id is Global attributes, they can be used on all elements, though the attributes may have no effect on some elements.
  • Must be unique in the whole document.
  • This attribute's value must not contain white spaces, in contrast to the class attribute, which allows space-separated values.
  • Using characters except ASCII letters and digits, '_', '-' and '.' may cause compatibility problems, as they weren't allowed in HTML 4. Though this restriction has been lifted in HTML 5, an ID should start with a letter for compatibility.

Based on personal experiences and according to the W3 Schools 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.

https://www.w3schools.com/tags/ref_attributes.asp


Below is an interesting use of the id attribute. It is used within the tag and used to identify the form for elements outside of the boundaries so that they will be included with the other 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">

ID i used to uniquely identify an element.

Name is used in forms. when even u submit a form. and if you dont give any name, nothing will will be submitted. And the ones only with name attribute will go out.


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.

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).


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 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.


See this http://mindprod.com/jgloss/htmlforms.html#IDVSNAME

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 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.


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.


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.


The way I think about it and use it is simple:

id is used for CSS and JavaScript/jQuery (has to be unique in a page)

name is used for form handling in PHP when a form is submitted via HTML (has to be unique in a form - to some extent, see Paul's comment below)



<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>






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