检查window.open支持-JavaScript

Question

I am working on fixing a bug regarding window.open being triggered on mobile safari. Whenever this happens, an error is triggered as it seems window is not defined or the function is not supported?

The approach I am considering taking is to check if window.open is supported. If so, open the window like normal. If not, simply redirect the page. But how could I check for this support?

if (window.open) {
   var helpWindow = window.open('help.htm', 'DBHelp', 'width=800,height=600,left=100,top=100');
} else {
   this.navigateTo('help.htm');
}

This is what I am trying, only with some dummy data in the URL for now. How could I best go about this?

Answer 1

Use window.open to open a random page and check for the body element. If it's there, then the page opened correctly, so window.open is supported.

Edit: Even better, window.open will return null if the call failed.

Answer 2

It sounds like window.open is defined, but it's not able to open a new window. So check the return value rather than the function name.

var helpWindow = window.open('help.htm', 'DBHelp', 'width=800,height=600,left=100,top=100');
if (!helpWindow) {
    this.navigateTo('help.html');
}