How to implement click event throttling in vue

In Vue project development, we may encounter situations where click events are frequently triggered. For example, if a user continuously clicks a button, it may cause abnormal behavior on the page and affect the user experience. Therefore, in this case, we need to throttle the click event to avoid affecting the user experience. This article will introduce how to implement click event throttling in Vue.

1. What is click event throttling

Click event throttling is a method to optimize front-end performance. It allows us to limit an action to only be executed once within a certain period of time. For example, when a user triggers click events multiple times in a short period of time, we want to only execute the last click event instead of executing it every time. In this case, we can use click event throttling to deal with the problem.

2. Why use click event throttling

In web development, we often encounter pages similar to "waterfall flow". Users need to click frequently to load more pages. data. If we do not use throttling, multiple requests will be sent to the backend in a short period of time, which will not only cause performance problems, but also affect the user experience.

Using throttling can limit the frequency of user operations, avoid abnormal page behavior, and optimize the user experience.

3. How to implement throttling in Vue

Vue provides a very convenient instruction v-throttle to implement click event throttling. Next, let’s take a look at the implementation of v-throttle.

1. Installationv-throttle

We can install v-throttle through npm, use the following command:

npm install --save v-throttle

2. Using v-throttle in Vue

First, we need to introduce the v-throttle directive in the Vue component, And use this directive where throttling operations are required. For example, in the following example, we create a button and use the v-throttle directive to limit the click frequency of the button:

<template>
  <button v-throttle:click="btnClick">Click Me!</button>
</template>

<script>
import throttle from 'v-throttle';

export default {
  methods: {
    btnClick: throttle(function() {
      console.log('click')
    }, 1000)
  }
}
</script>

In the above example, we pass a The function gives the v-throttle instruction and specifies a time interval of 1000 milliseconds. This means that when the user clicks the button, the click event is executed at most once every 1000 milliseconds.

4. Implementation Principle

In Vue, the implementation principle of the v-throttle instruction is to utilize the closure feature of functions in Javascript. Specifically, the click event processing function is encapsulated in a closure, and the time when the function was last executed is recorded at the same time. Each time the user clicks the button, we will check whether the current time meets the time interval requirements, execute the function if it does, and update the time record of the last time the function was executed.

Next, let’s take a look at the code implementation of the v-throttle instruction:

import throttle from 'lodash-es/throttle';

export default {
  bind(el, binding) {
    const delay = parseInt(binding.arg) || 500;
    const method = binding.value;
    const throttled = throttle(method, delay);
    el.addEventListener('click', throttled);
  },
  unbind(el, binding) {
    const method = binding.value;
    el.removeEventListener('click', method);
  }
}

In the above code, we first introduced the in the Lodash library throttle function and combine this function with the processing function bound to the instruction. Then, when the directive is bound, we add a hook function bind that will be executed when the directive is bound to the element. In this hook function, we use the addEventListener function to bind the throttled function to the element's click event.

Finally, when the directive is unbind, we added another hook function unbind, which will be executed when the directive is unbind from the element, and utilize removeEventListener Function to remove the event handler from the element's event listener. This ensures that the directive is unbound from the element.

5. Summary

Using click event throttling can avoid frequent events and optimize front-end performance. The Vue framework provides the v-throttle directive to facilitate us to implement this function. Through the introduction and analysis of the implementation principle of this directive, we can better understand how throttling works and how to implement click event throttling in Vue.

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