Let's talk about how uniapp binds mouse events

With the popularity of mobile devices, Web development has gradually shifted to mobile terminals, and single-page applications (SPA) have also become a popular front-end development method. However, the biggest problem of SPA is that it is not smooth enough to use, and the user operation value is affected. In order to solve this problem, many developers try to choose to use native applications instead of SPA.

Uniapp (Universal Application) is a cross-platform development framework that can adapt a set of codes to multiple platforms at the same time, including H5, mini programs, iOS, Android, and quick applications. It is currently more popular. One of the cross-end development frameworks. In developing Uniapp, binding mouse events is a very important step. Let's introduce how Uniapp binds mouse events.

1. Mouse event binding method

Mouse events in Uniapp are the same as in Web development, that is to say, you can use addEventListener to bind mouse events, as shown below:

this.$refs.btn.addEventListener('click', function() {
  // do something
})

Using addEventListener can bind multiple callback functions, which is very convenient.

Another commonly used binding method is to use @click, as shown below:

<button @click="handleClick"></button>

where handleClick is a callback function defined in methods, which can handle page logic internally.

2. Mouse event preprocessing

Sometimes it is necessary to preprocess the event before binding the mouse event, such as detecting whether the user is performing an operation or restricting certain user behaviors. wait. In this case, Uniapp provides many preprocessing functions, such as preventDefault, stopPropagation, etc.

<button @click.prevent="handleClick"></button>

Among them, prevent is to prevent the default behavior. If it is an input box, it will prevent the input. If it is a button, it will prevent the default jump behavior of the button; stopPropagation is to prevent the event from bubbling.

3. Mouse event parameters

When processing mouse events, it is often necessary to obtain the event object and its properties. In Uniapp, the event object e can be obtained by passing parameters through the event, as shown below: In the

<button @click="handleClick($event)">Click me!</button>

method, the event object can be obtained by passing the parameter e. You can use e.target to obtain the DOM node of the click target. , you can also use e.type to get the current event type, etc.

4. Bind multiple mouse events

Sometimes it is necessary to bind multiple mouse events at the same time. This can also be achieved in Uniapp, as shown below:

<button @mousedown="handleMousedown" @mousemove="handleMousemove" @mouseup="handleMouseup"></button>

Among them , @mousedown, @mousemove and @mouseup respectively correspond to the mouse press, mouse move and mouse release behaviors. When processing multiple mouse events, you need to pay attention to the event sequence relationship between each event.

The above are the methods and precautions for binding mouse events in Uniapp. I hope it will be helpful to everyone.

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