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HTML: Radio button

Imagine you're offering the user a choice of having the product delivered by courier or by mail. Checkboxes won't work here since you have to choose only one option.

If you want to create a switch that can handle only one of several options, you can use radio buttons. They get their name from old car radios where you could press one of the many buttons to select the frequency.

Choose a radio station




To create a radio button, as well as a checkbox, we use two tags:

  • <input> with type="radio". name is a required attribute, and its value is, naturally, a name. This name must be the same for the whole group of radio buttons. Without this attribute, it'll be possible to select all the values at once, because the browser will not see the connection between them
  • <label> which will contain the text associated with the radio button we want

<input> is linked with <label> in one of two familiar scenarios:

  • Link by id. To do this you must set a unique id for <input>, and link the <label> with the radio button using the attribute for
  <form>
    <input id="yes" type="radio" name="question">
    <label for="yes">Yes</label>

    <input id="no" type="radio" name="question">
    <label for="no">No</label>
  </form>
  • Put <input> inside the <label> tag. This does not require a unique id
  <form>
    <label>
      <input type="radio" name="question">
      Yes
    </label>
    <br>
    <label>
      <input type="radio" name="question">
      No
    </label>
  </form>

The value attribute, which has a value that allows you to determine the radio button, is used to find out which item was selected after sending the form to the server.

<form>
  <label>
    <input type="radio" name="question" value="yes">
    Yes
  </label>
  <br>
  <label>
    <input type="radio" name="question" value="no">
    No
  </label>
</form>

Instructions

Create a form with a data handler file at /people. Create two radio buttons inside the form. Link them by putting <input> inside <label>. Choose a unique name for the delivery radio buttons. Don't forget to add the value attribute

The exercise doesn't pass checking. What to do? 😶

If you've reached a deadlock it's time to ask your question in the «Discussions». How ask a question correctly:

  • Be sure to attach the test output, without it it's almost impossible to figure out what went wrong, even if you show your code. It's complicated for developers to execute code in their heads, but having a mistake before their eyes most probably will be helpful.
In my environment the code works, but not here 🤨

Tests are designed so that they test the solution in different ways and against different data. Often the solution works with one kind of input data but doesn't work with others. Check the «Tests» tab to figure this out, you can find hints at the error output.

My code is different from the teacher's one 🤔

It's fine. 🙆 One task in programming can be solved in many different ways. If your code passed all tests, it complies with the task conditions.

In some rare cases, the solution may be adjusted to the tests, but this can be seen immediately.

I've read the lessons but nothing is clear 🙄

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