JavaScript Unicode's length (astral symbols)

Question

I have a < input type=\"text\" > (in HTML) and everytime I add a character I do a if text.length < x {...} (in JavaScript).

The problem i

Answer 1

I think you have most of the research done, you only need to put all of it together:

Taking the function that your link provides:

function countSymbols(string) {
    var regexAstralSymbols = /[\uD800-\uDBFF][\uDC00-\uDFFF]/g;
    return string
        // Replace every surrogate pair with a BMP symbol.
        .replace(regexAstralSymbols, '_')
        // …and *then* get the length.
        .length;
}

your if should be

if (countSymbols(document.getElementById("1").value)<16) { ...}

For example: countSymbols('