React JS 如何禁用缩放

Question

Im building a web app and I want to disable the zoom with 2 fingers. I have tried this

meta name="viewport" content=" width=device-width, initial-scale=1, maximum-scale=1, user-scalable=0"

but is not working. The app will run on tablets.

Thank you !

Answer 1

With the React-Helmet you can put your metadata in the render-function of your Component like this:

render(){ 
    return <div>
        <Helmet>
              <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no"
        </Helmet>
        [...]
    </div>
}

Look at the Helmet documentation for further information.

Answer 2

Disables iOS pinch-zoom

window.addEventListener(
  "touchmove",
  function (event) {
    if (event.scale !== 1) {
      event.preventDefault();
      event.stopImmediatePropagation();
    }
  },
  { passive: false }
);

Tested on iOS 15.3 in Safari and Brave.