How to validate pattern matching in textarea?

Question

When I use textarea.checkValidity() or textarea.validity.valid in javascript with an invalid value both of those always return true, what am I doing wrong?

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Answer 1

You can implement this yourself with setCustomValidity(). This way, this.checkValidity() will reply whatever rule you want to apply to your element. I don't think this.validity.patternMismatch can set manually, but you could use your own property instead, if needed.

http://jsfiddle.net/yanndinendal/jbtRU/22/

$('#test').keyup(validateTextarea);

function validateTextarea() {
    var errorMsg = "Please match the format requested.";
    var textarea = this;
    var pattern = new RegExp('^' + $(textarea).attr('pattern') + '$');
    // check each line of text
    $.each($(this).val().split("\n"), function () {
        // check if the line matches the pattern
        var hasError = !this.match(pattern);
        if (typeof textarea.setCustomValidity === 'function') {
            textarea.setCustomValidity(hasError ? errorMsg : '');
        } else {
            // Not supported by the browser, fallback to manual error display...
            $(textarea).toggleClass('error', !!hasError);
            $(textarea).toggleClass('ok', !hasError);
            if (hasError) {
                $(textarea).attr('title', errorMsg);
            } else {
                $(textarea).removeAttr('title');
            }
        }
        return !hasError;
    });
}