Vue determines whether there is touch function

More and more devices now have touch functions, and for developers, they need to handle different devices differently in their projects. When using the vue.js framework to develop mobile applications, how to determine whether the device has touch functionality?

Method 1: Determine through the browser

In the browser, you can use the following code to determine whether the device supports touch function:

if ('ontouchstart' in document.documentElement) {
  // 支持触控
} else {
  // 不支持触控
}

The principle of this code is to determine Whether the document root element supports the ontouchstart event. If it does, it means the device has touch functionality. This judgment method is simple and effective, but it only applies to the browser and cannot be used directly in the vue.js framework.

Method 2: Determine through mobile devices

Mobile devices often have touch functions, so you can judge by the following code:

if ('ontouchstart' in window || navigator.maxTouchPoints) {
  // 支持触控
} else {
  // 不支持触控
}

The principle of this code It is to determine whether the ontouchstart property or the navigator.maxTouchPoints property exists in the global object window. If it exists, it means that the device has touch function. This judgment method is very convenient to use and can be used directly in the vue.js framework.

Method 3: Through the Vue.directive extension instruction

We can use the Vue.directive extension instruction to customize a v-touch instruction to determine whether the device supports it Touch functionality. The specific implementation is as follows:

Vue.directive('touch', {
  bind: function (el, binding) {
    if ('ontouchstart' in window || navigator.maxTouchPoints) {
      el.classList.add(binding.value);
    }
  }
});

When using it, we can pass the class name that needs to be added into the command parameters, as follows:

<button v-touch="btn-has-touch">Click me!</button>

This code will be used when the device supports touch function. Add the btn-has-touch class name to the button so that we can perform corresponding processing in the style.

Summary

With the above methods, we can more easily determine whether the device has touch function. At the same time, we can also use v-touch and other instructions to handle touch events more conveniently in vue.js. In actual development, different judgment methods can be selected and used according to project requirements and target user groups.

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