validating html color codes JS

Question

i am looking for code to validate html color codes. wanna check if user typed valid color code, can you guyz help ?

i know i need that regex stuff but i cant understand a think about that regex things :S

thanks

Answer 1

You can match hexadecimal colors like this:

if (/^#[0-9a-f]{3}([0-9a-f]{3})?$/i.test(str)) {
    //Match
}

Note that this wont handle names or rgb(n, n, n).

You can match rgb(x, y, z) colors like this:

if (/^rgb\s*(\s*[012]?[0-9]{1,2}\s*,\s*[012]?[0-9]{1,2}\s*,\s*[012]?[0-9]{1,2}\s*)$/i.test(str)) {
    //Match
}

Note that this will match rgb(299, 299, 299).

Answer 2

You could create an abstract element and attempt to apply the color to that element:

function validate_color(c) {
    var litmus = 'red';
    var d = document.createElement('div');
    d.style.color=litmus;
    d.style.color=c;
    //Element's style.color will be reverted to litmus or set to '' if an invalid color is given
    if( c !== litmus && (d.style.color === litmus || d.style.color === '')){
        return false;
    }
    return true;
}