It is blocked by the browser. window.open
is only not being blocked, when it is invoked by user action, for example in a click event, emitted by a native browser event. Also javaScript emitted events are being blocked, just like delayed setTimeout callbacks.
<a id="link" href="http://stackoverflow.com">StackOverflow</a>
<script type="text/javascript">
// Example (with jQuery for simplicity)
$("a#link").click(function (e) {
e.preventDefault();
var url = this.href;
// this will not be blocked
var w0 = window.open(url);
console.log("w0: " + !!w0); // w0: true
window.setTimeout(function () {
// this will be blocked
var w1 = window.open(url);
console.log("w1: " + !!w1); // w1: false
}, 5000);
});
</script>
Watch the Fiddle. I also tried it with the keypress
event, but no luck.
window.open
returns a valid reference to the new (or an existing named) window, or null
when it failed to create a new window.