Question

I am trying to use a setTimeout function that calls itself and is broken by a counter. However, I keep gettng a NaN error. Can someone help me?

<script language="javascript">
    function Tests() {
        this.i = 0;
    }


    Tests.prototype.increment_test = function () {
        if (this.i > 2) {
            return;
        }
        alert(this.i);
        this.i++;

        setTimeout(this.increment_test, 30);
    }

    ta = new Tests();
    ta.increment_test();
</script>

Answer 1

When running a function from setInterval the context in “this” variable is not your object but “window” object. You need to pass the context in the following way:

setTimeout(this.increment_test.apply(this), 30)