TypeError: undefined is not a function

[andresb]

I am using this script:

if (window.matchMedia("(max-width: 1440px)").matches) {
var a = document.createElement("a");
var ulist = document.getElementById("areas");
var newItem = document.createElement("p");
a.textContent = "PRACTICE";
a.setAttribute('href', "practice");
newItem.appendChild(a);
ulist.prepend(newItem);
}

It works fine but in iphone, which displays this error:

TypeError: undefined is not a function (evaluating ‘ulist.prepend(newItem)’)

Is something wrong with the script?

[chrisofarabia]

I have a few questions

• What does your HTML look like?
• Are there any differences between the HTML where it does work, and what appears on the iPhone?
• Which browser are you using on the iPhone?
• Have you tried any other browsers on the iPhone?

[Paul_Wilkins]

The prepend method is not supported in iOS Safari up to version 9.3
You might want to investigate more widely compatible ways to achieve the same thing.