Let user type only three different characters in an input text field

Question

Is there a way to let the user type only three characters? For example, I want to only allow 3, 6 or 9 in an input text field.

Answer 1

Here's a way to do it using jQuery: http://jsfiddle.net/ThiefMaster/UZJn2/

<input type="text" maxlength="1" class="only369" />



$('.only369').keyup(function(e) {
    if(this.value != '3' && this.value != '6' && this.value != '9') {
        this.value = '';   
    }
});