CODEWITHSUNDEEP
javascripthtml
user3258519
user3258519

Reputation: 1

Trying to only allow 4 numbers in a field

I am trying to make sure only to validate 4 digits which can only be numbers in a field, and letters cannot be accepted. Its for this field. 

<tr>
<td id="Exam_Number">Exam Number</td>
<td><input type="text" name="Exam_Number" /></td>
</tr>

Upvotes: 0

Views: 1222

Answers (3)

scorkla
scorkla

Reputation: 300

Helpful answer here

Specifically, you'd want to change your input element to:

<input type="text" maxlength="4" pattern="[0-9]{4}" title="Four digit test number" name="Exam_Number"/>

AND use jQuery to only allow digits as shown here

$("#myField").keyup(function() {
    $("#myField").val(this.value.match(/[0-9]*/));
});

Upvotes: 2

Frankenscarf
Frankenscarf

Reputation: 1219

Setting the input attribute maxlength="4" will restrict the number of characters entered to 4. If your audience is exclusively html5 you can change the input type to "number", otherwise it's going to be a matter of validation and user alerts.

Upvotes: 0

user3111737
user3111737

Reputation:

If you are using PHP, use strlen() for checking the string lenght and is_numeric() for checking that they are numbers.

Upvotes: 0

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