Detailed explanation of v-on directive in Vue: how to handle keyboard press and release events

Detailed explanation of the v-on instruction in Vue: How to handle keyboard press and release events, specific code examples are needed

Introduction:
In Vue, v The -on directive is used to listen to DOM events and execute the corresponding method when the event is triggered. Keyboard press and release events are one of the common DOM events and are often used during the development process. This article will introduce in detail how to use the v-on instruction in Vue to handle keyboard press and release events, and provide specific code examples.

1. Use the v-on directive to handle keyboard press events
1.1 Monitor global keyboard press events

In Vue, you can use the v-on directive to monitor global keyboard press events . The specific steps are as follows:

(1) Define a method in the Vue instance to handle keyboard press events. For example, we define a method called handleKeyDown.

(2) Use the v-on directive in the template to listen for keyboard press events and bind it to the handleKeyDown method. The specific code is as follows:

<template>
  <div>
    <input type="text" v-on:keydown="handleKeyDown" />
  </div>
</template>

<script>
export default {
  methods: {
    handleKeyDown(event) {
      // 获取键码
      const keyCode = event.keyCode;
      
      // 处理按下的键
      switch (keyCode) {
        case 13: // Enter键
          console.log("按下了Enter键");
          break;
        case 37: // 左方向键
          console.log("按下了左方向键");
          break;
        case 39: // 右方向键
          console.log("按下了右方向键");
          break;
        default:
          console.log("按下了其他键");
          break;
      }
    }
  }
}
</script>

In the above code, we use the v-on directive to listen for the keyboard press event of the input element and bind it to the handleKeyDown method. In the handleKeyDown method, we obtain the pressed key code through event.keyCode, and then perform corresponding operations based on the key code.

1.2 Monitor the press event of the specified key

In addition to monitoring the global keyboard press event, we can also use the v-on command to monitor the press event of the specified key. The specific steps are as follows:

(1) Define a method in the Vue instance to handle the press event of the specified key. For example, we define a method called handleEnterKey.

(2) Use the v-on directive in the template to listen for the press event of the specified key and bind it to the handleEnterKey method. The specific code is as follows:

<template>
  <div>
    <input type="text" v-on:keydown.enter="handleEnterKey" />
  </div>
</template>

<script>
export default {
  methods: {
    handleEnterKey() {
      console.log("按下了Enter键");
    }
  }
}
</script>

In the above code, we use the v-on directive to listen for the press event of the Enter key of the input element and bind it to the handleEnterKey method. When the Enter key is pressed, the handleEnterKey method will be triggered and the corresponding information will be output.

2. Use the v-on directive to handle keyboard release events
2.1 Monitor global keyboard release events

In Vue, you can use the v-on directive to monitor global keyboard release events. The specific steps are as follows:

(1) Define a method in the Vue instance to handle the keyboard release event. For example, we define a method called handleKeyUp.

(2) Use the v-on directive in the template to listen for the keyboard release event and bind it to the handleKeyUp method. The specific code is as follows:

<template>
  <div>
    <input type="text" v-on:keyup="handleKeyUp" />
  </div>
</template>

<script>
export default {
  methods: {
    handleKeyUp(event) {
      // 获取键码
      const keyCode = event.keyCode;
      
      // 处理释放的键
      switch (keyCode) {
        case 13: // Enter键
          console.log("释放了Enter键");
          break;
        case 37: // 左方向键
          console.log("释放了左方向键");
          break;
        case 39: // 右方向键
          console.log("释放了右方向键");
          break;
        default:
          console.log("释放了其他键");
          break;
      }
    }
  }
}
</script>

In the above code, we use the v-on instruction to listen to the keyboard release event of the input element and bind it to the handleKeyUp method. In the handleKeyUp method, we obtain the released key code through event.keyCode, and then perform corresponding operations based on the key code.

2.2 Monitor the release event of the specified key

In addition to monitoring the global keyboard release event, we can also use the v-on command to monitor the release event of the specified key. The specific steps are as follows:

(1) Define a method in the Vue instance to handle the release event of the specified key. For example, we define a method called handleEnterKeyUp.

(2) Use the v-on directive in the template to listen for the release event of the specified key and bind it to the handleEnterKeyUp method. The specific code is as follows:

<template>
  <div>
    <input type="text" v-on:keyup.enter="handleEnterKeyUp" />
  </div>
</template>

<script>
export default {
  methods: {
    handleEnterKeyUp() {
      console.log("释放了Enter键");
    }
  }
}
</script>

In the above code, we use the v-on instruction to listen to the release event of the Enter key of the input element and bind it to the handleEnterKeyUp method. When the Enter key is released, the handleEnterKeyUp method will be triggered and corresponding information will be output.

Conclusion:
The above is a detailed introduction to using the v-on instruction in Vue to handle keyboard press and release events. Through the above code examples, we can clearly understand how to handle keyboard press and release events in Vue. I hope this article will be helpful to you in the Vue development process.

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