I have Apps that show interstitial ad when user choose an action - show interstitial ad - next page loaded. Used js api Website2APK.showInterstitialAd();
Read Admob policies here https://support.google.com/admob/answer/6201362
Example code :
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Untitled Page</title>
<style>
body
{
background-color: #FFFFFF;
color: #000000;
font-family: Arial;
font-weight: normal;
font-size: 13px;
line-height: 1.1875;
margin: 0;
padding: 0;
}
a
{
color: #0000FF;
text-decoration: underline;
}
a:visited
{
color: #800080;
}
a:active
{
color: #FF0000;
}
a:hover
{
color: #0000FF;
text-decoration: underline;
}
input:focus, textarea:focus, select:focus
{
outline: none;
}
#Button1
{
border: 1px solid #2E6DA4;
border-radius: 4px;
background-color: #3370B7;
background-image: none;
color: #FFFFFF;
font-family: Arial;
font-weight: normal;
font-size: 13px;
margin: 0;
}
</style>
</head>
<body>
<input type="button" id="Button1" onclick="Website2APK.showInterstitialAd();window.location.href='https://support.google.com/admob/answer/6201362';return false;" name="" value="Next Page" style="position:absolute;left:9px;top:9px;width:96px;height:25px;z-index:0;">
</body>
</html>