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Can I apply the required attribute to <select> fields in HTML5?

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不知归路
不知归路 2020-11-22 16:20

How can I check if a user has selected something from a doesn\'t support the new

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  • 一个人的身影
    2020-11-22 16:50

    Make the value of first item of selection box to blank.

    So when every you post the FORM you get blank value and using this way you would know that user hasn't selected anything from dropdown.

    <select name="user_role" required>
    <option value="">-Select-</option>
    <option value="User">User</option>
    <option value="Admin">Admin</option>
</select>
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  • 悲哀的现实
    2020-11-22 16:52

    In html5 you can do using the full expression:

    <select required="required">

    I don't know why the short expression doesn't work, but try this one. It will solve.

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  • 小蘑菇
    2020-11-22 16:52

    You can do it also dynamically with JQuery

    Set required

    $("#select1").attr('required', 'required');

    Remove required

    $("#select1").removeAttr('required');
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  • 名媛妹妹
    2020-11-22 16:54 
    <form action="">

<select required>

  <option selected disabled value="">choose</option>
  <option value="red">red</option>
  <option value="yellow">yellow</option>
  <option value="green">green</option>
  <option value="grey">grey</option>

</select>
<input type="submit">
</form>
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  • 我在风中等你
    2020-11-22 16:54

    first you have to assign blank value in first option. i.e. Select here.than only required will work.

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  • 别那么骄傲
    2020-11-22 16:54

    try this, this gonna work, I have tried this and this works.

    <!DOCTYPE html>
<html>
<body>

<form action="#">
<select required>
  <option value="">None</option>
  <option value="volvo">Volvo</option>
  <option value="saab">Saab</option>
  <option value="mercedes">Mercedes</option>
  <option value="audi">Audi</option>
</select>
<input type="submit">
</form>

</body>
</html>
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