Null array in javascript

Question

I have script in JS:

$("#mailstextarea").on("change keyup paste click", function(){
    var text = this.value;
    var rez =  text.match(/([a-zA-Z0-9._-]+@[a-zA-Z0-9._-]+\.[a-zA-Z0-9._-]+)/gi);
    document.getElementById("emails").innerHTML = rez;

    for(var i = 0; i < rez.length; i++){
        addRow(rez[i]);
    }

})

When in #mailstextarea I type text with mails, I see this mails in div #emails, but I get error on rez.length „Cannot read property 'length' of null”. Why? Thanks!

"An Array containing the matched results or null if there were no matches." — Marty
– Marty, Commented Feb 28, 2014 at 9:16

xdazz · Accepted Answer · 2014-02-28 09:15:29Z

1

.match() will return null if nothing is matched.

Just add a if check:

if (rez) {
    for(var i = 0; i < rez.length; i++){
        addRow(rez[i]);
    }
}

Or you could set rez to an empty array when nothing matched.

var rez =  text.match(/([a-zA-Z0-9._-]+@[a-zA-Z0-9._-]+\.[a-zA-Z0-9._-]+)/gi) || [];

answered Feb 28, 2014 at 9:15

xdazz

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