PHP : Preventing multiple javascript inclusions

Question

Hi i'm having a problem with inclusion of javascripts specifically Google maps API.

I have a page for example that includes the library:

<script src="https://maps.googleapis.com/maps/api/js?v=3.exp&libraries=places,visualization"></script>

//some page contents

$this->widget('MyWidgetThatIncludesGoogleAPI',array(
..
));

The problem arises when I call my widget which also includes google maps api, and even if I don't initially include the maps api in this page. Calling the widget twice does the same.

I get an error saying that Google Maps API has been loaded multiple times, is there a programmatic way to handle duplicate inclusion of js?

as i've mentioned in my post; even if i don't include it, calling a widget twice, or even doing a renderPartial() to a page having it causes the inclusion fo the js twice. — muffin
– muffin, Commented Oct 14, 2014 at 2:37

cjc · Accepted Answer · 2014-10-14 01:58:16Z

1

You could use a global variable to track whether it has already been included. You could then create a function to include the script if it hasn't already been included.

$includedGoogleMaps = false;
function includeGoogleMaps() {
    global $includedGoogleMaps;
    if (!includedGoogleMaps) {
        echo '<script src="https://maps.googleapis.com/maps/api/js?v=3.exp&libraries=places,visualization"></script>';
        $includeGoogleMaps = true;
    }
}

The function isn't exactly necessary but it makes everything a lot cleaner.

answered Oct 14, 2014 at 1:58

cjc

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