required method

required()Returns: Boolean

Description: Makes the element required.

  • required()

    • This method does not accept any arguments.
  • required( dependency-expression )

    • dependency-expression
      Type: String
      An expression (String) that is evaluated in the context of the element’s form, making the field required only if the expression returns more than one element.

      Very often your expression will use selector filters such as #foo:checked, #foo:filled, #foo:visible. This plugin provides custom selectors for that purpose.

  • required( dependency-callback )

    • dependency-callback
      Type: Function()
      The function is executed with the element as it’s only argument: If it returns true, the element is required.
Return false, if the element is empty (text input) or unchecked (radio/checkbox) or if nothing is selected (select).

Works with text inputs, selects, checkboxes and radio buttons.

To force a user to select an option from a select box, provide an empty option element like <option value=””>Choose…</option>

Examples:

Example: Makes “field” always required. Nothing and blanks are invalid.

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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Makes "field" always required. Nothing and blanks are invalid.</title>
<link rel="stylesheet" href="http://jqueryvalidation.org/files/demo/site-demos.css">
</head>
<body>
<form id="myform">
<label for="field">Required: </label>
<input type="text" class="left" id="field" name="field">
<br/>
<input type="submit" value="Validate!">
</form>
<script src="http://code.jquery.com/jquery-1.11.1.min.js"></script>
<script src="http://jqueryvalidation.org/files/dist/jquery.validate.min.js"></script>
<script src="http://jqueryvalidation.org/files/dist/additional-methods.min.js"></script>
<script>
// just for the demos, avoids form submit
jQuery.validator.setDefaults({
debug: true,
success: "valid"
});
$( "#myform" ).validate({
rules: {
field: {
required: true
}
}
});
</script>
</body>
</html>

Demo:

Example: Makes the fruit select required.

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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Makes the fruit select required.</title>
<link rel="stylesheet" href="http://jqueryvalidation.org/files/demo/site-demos.css">
</head>
<body>
<form id="myform">
<label for="fruit">Please select a fruit</label>
<select id="fruit" name="fruit" title="Please select something!">
<option value="">Select...</option>
<option value="1">Banana</option>
<option value="2">Apple</option>
<option value="3">Peach</option>
</select>
<br/>
<input type="submit" value="Validate!">
</form>
<script src="http://code.jquery.com/jquery-1.11.1.min.js"></script>
<script src="http://jqueryvalidation.org/files/dist/jquery.validate.min.js"></script>
<script src="http://jqueryvalidation.org/files/dist/additional-methods.min.js"></script>
<script>
// just for the demos, avoids form submit
jQuery.validator.setDefaults({
debug: true,
success: "valid"
});
$( "#myform" ).validate({
rules: {
fruit: {
required: true
}
}
});
</script>
</body>
</html>

Demo:

Example: Makes the gender radio buttons required.

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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Makes the gender radio buttons required.</title>
<link rel="stylesheet" href="http://jqueryvalidation.org/files/demo/site-demos.css">
</head>
<body>
<form id="myform">
<label for="gender_male">
<input type="radio" id="gender_male" value="m" name="gender" />
Male
</label>
<label for="gender_female">
<input type="radio" id="gender_female" value="f" name="gender"/>
Female
</label>
<label for="gender" class="error">Please select your gender</label>
<br/>
<input type="submit" value="Validate!">
</form>
<script src="http://code.jquery.com/jquery-1.11.1.min.js"></script>
<script src="http://jqueryvalidation.org/files/dist/jquery.validate.min.js"></script>
<script src="http://jqueryvalidation.org/files/dist/additional-methods.min.js"></script>
<script>
// just for the demos, avoids form submit
jQuery.validator.setDefaults({
debug: true,
success: "valid"
});
$( "#myform" ).validate({
rules: {
gender: {
required: true
}
}
});
</script>
</body>
</html>

Demo:

Example: Makes the agree checkbox required.

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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Makes the agree checkbox required.</title>
<link rel="stylesheet" href="http://jqueryvalidation.org/files/demo/site-demos.css">
</head>
<body>
<form id="myform">
<label for="agree">Please agree to our policy</label>
<input type="checkbox" id="agree" title="Please agree to our policy!" name="agree" />
<br/>
<input type="submit" value="Validate!">
</form>
<script src="http://code.jquery.com/jquery-1.11.1.min.js"></script>
<script src="http://jqueryvalidation.org/files/dist/jquery.validate.min.js"></script>
<script src="http://jqueryvalidation.org/files/dist/additional-methods.min.js"></script>
<script>
// just for the demos, avoids form submit
jQuery.validator.setDefaults({
debug: true,
success: "valid"
});
$( "#myform" ).validate({
rules: {
agree: {
required: true
}
}
});
</script>
</body>
</html>

Demo:

Example: Makes details required only if #other is checked.

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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Makes details required only if #other is checked.</title>
<link rel="stylesheet" href="http://jqueryvalidation.org/files/demo/site-demos.css">
</head>
<body>
<form id="myform">
<label for="other">Check to make next field required</label>
<input id="other" type="checkbox">
<br>
<input id="details" name="details">
<br>
<input type="submit" value="Validate!">
</form>
<script src="http://code.jquery.com/jquery-1.11.1.min.js"></script>
<script src="http://jqueryvalidation.org/files/dist/jquery.validate.min.js"></script>
<script src="http://jqueryvalidation.org/files/dist/additional-methods.min.js"></script>
<script>
// just for the demos, avoids form submit
jQuery.validator.setDefaults({
debug: true,
success: "valid"
});
$( "#myform" ).validate({
rules: {
details: {
required: "#other:checked"
}
}
});
</script>
</body>
</html>

Demo:

Example: Makes “parent” required only if age is below 13.

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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Makes "parent" required only if age is below 13.</title>
<link rel="stylesheet" href="http://jqueryvalidation.org/files/demo/site-demos.css">
</head>
<body>
<form id="myform">
<label>Age </label>
<input id="age" name="age">
<br>
<label>Parent </label>
<input id="parent" name="parent">
<br>
<input type="submit" value="Validate!">
</form>
<script src="http://code.jquery.com/jquery-1.11.1.min.js"></script>
<script src="http://jqueryvalidation.org/files/dist/jquery.validate.min.js"></script>
<script src="http://jqueryvalidation.org/files/dist/additional-methods.min.js"></script>
<script>
// just for the demos, avoids form submit
jQuery.validator.setDefaults({
debug: true,
success: "valid"
});
$( "#myform" ).validate({
rules: {
age: {
required: true,
min: 3
},
parent: {
required: function(element) {
return $("#age").val() < 13;
}
}
}
});
</script>
</body>
</html>

Demo: