ReferenceError SetInterval not defined

Question

Nearly all the SetInterval errors I've seen here on StackOverflow are due to passing a function name as a "string," but maybe I am still missing some sort of variable scope problem. Please advise! I'm creating a slideshow with pause and play capabilities. When playing, I want the slides to advance every 3 seconds. But the SetInterval to launch the NextSlide function is failing after executing once. I've tried it as... ``` SetInterval("nextSlide()", 3000) SetInterval(nextSlide(), 3000) var t = SetInterval(nextSlide(), 3000) var t = SetInterval(function(){nextSlide(), 3000) ``` ... with failure every time. What am I missing here? ``` var slide_1 = "slide_1"; var slide_2 = "slide_2"; var slideNum = 0; var odd = true; var totalMax = 6; var busy = false; var allSlides = new Array(); allSlides[0] = "test_01"; allSlides[1] = "test_02"; allSlides[2] = "test_03"; allSlides[3] = "test_04"; allSlides[4] = "test_05"; allSlides[5] = "test_06"; allSlides[6] = "test_07"; function PlaySlide(){ var t…

Accepted Answer

```
var t = SetInterval(nextSlide(),3000)
        ^                    ^^
```

You have 2 problems

There is no SetInterval, the s is lowercase. Second, you are calling the function `nextSlide()`, not assigning it

```
var t = window.setInterval(nextSlide, 3000);
```

ReferenceError SetInterval not defined

Solution

Problem