How to disable web page zooming/scaling on Android?
I have written a small web app to collect some data and store it in a central database. I'm walking around, reading values and typing them into a web site on my Android smartphone. It's just for me, so no public usability concerns apply this time.
Now I want to add a button to increment a reading by one, and I need to be able to push that button several times. But if I do it too fast, the browser recognises a double-tab and scales/zooms into the page.
I have added a viewport header already and played with every value combination I could find on the web. But the page remains scalable. How can I stop that?
Here's a minimal test page that fails for me:
<!doctype html>
<html>
<head>
<title>Test page</title>
<meta name="viewport" content="width=device-width, user-scalable=no" />
<style type="text/css">
body
{
font: 16pt sans-serif;
}
</style>
</head>
<body>
This is a test page. It should not be scalable by the user at all. Not with the two-pinger pinch gesture and even less with a double-tap on the text.
</body>
</html>
Adding initial-scale=1, maximum-scale=1 and all sorts of target-whateveritwas-dpi doesn't change a thing. I have restarted the browser (Dolphin HD and the stock browser) and cleared the cache already. I'm on Android 2.2, the phone is an HTC Desire.
Answer
This worked for me in all android browsers:
<meta content='width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0' name='viewport' />
A common mistake is that people use 2 meta viewport tags like this:
<meta content='width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0' name='viewport' />
<meta name="viewport" content="width=device-width" />
The second meta viewport tag overrides the first one in some browsers (for example - chrome for android). There is no reason to have two meta viewport tags, as the second one is contained within the first one.
See This answer for more details