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How to achieve a scrolling loading effect similar to WeChat chat records in Vue?
How to achieve a scrolling loading effect similar to WeChat chat records in Vue?
Apr 04, 2025 pm 04:12 PM
Vue.js simulates the scrolling loading effect of WeChat chat history
This article demonstrates how to achieve a scrolling loading effect similar to WeChat chat records in Vue.js application. When the user scrolls to the top, more chat history is loaded and the scrollbar is in its current position rather than back to the top.
The following code provides a complete implementation solution:
<template>
<div id="app">
<div class="container" ref="chatListRef">
<ul>
<li v-for="item in msgs" :key="item">{{ item }}</li>
</ul>
</div>
</div>
</template>
<script>
import { ref, onMounted, nextTick } from 'vue';
export default {
setup() {
const msgs = ref([...generateNumbers(1, 200)]); // 初始數(shù)據(jù)
const chatListRef = ref(null);
const generateNumbers = (start, end) => {
// 生成數(shù)字序列，此處可替換為實(shí)際數(shù)據(jù)加載邏輯
const numbers = [];
for (let i = start; i <= end; i ) {
numbers.push(i);
}
return numbers;
};
const scrollToBottom = async () => {
await nextTick(); // 確保DOM更新完畢
chatListRef.value.scrollTop = chatListRef.value.scrollHeight;
};
const handleScroll = () => {
const container = chatListRef.value;
if (container.scrollTop === 0) {
const prevScrollHeight = container.scrollHeight;
const newMsgs = generateNumbers(msgs.value.length 1, msgs.value.length 100); // 加載更多數(shù)據(jù)
msgs.value = [...newMsgs, ...msgs.value]; // 將新數(shù)據(jù)添加到數(shù)組頭部
nextTick(() => {
container.scrollTop = container.scrollHeight - prevScrollHeight;
});
}
};
onMounted(() => {
scrollToBottom();
});
return { msgs, chatListRef, handleScroll };
},
};
</script>
<style scoped>
* {
margin: 0;
padding: 0;
}
html,
body {
height: 100vh;
background-color: #e9f5f8;
}
.container {
width: 200px;
height: 500px;
overflow-y: auto;
background-color: #fff;
}
</style>
The key to the code lies in the handleScroll function: it listens for scroll events, and when the scrollbar reaches the top ( container.scrollTop === 0 ), it loads new data, and uses nextTick to ensure that after the DOM is updated, the scrollbar position is recalculated, thus keeping the scrollbar in its original position. The generateNumbers function is a placeholder that needs to be replaced with your actual data loading logic (e.g., fetching data from the API). scrollToBottom function scrolls the scrollbar to the bottom after the component is mounted.
This improved version is more concise and uses the onMounted lifecycle hook function to initialize the scrollbar position, improving the readability and maintainability of the code. Remember to replace the generateNumbers function for your actual data acquisition method.
The above is the detailed content of How to achieve a scrolling loading effect similar to WeChat chat records in Vue?. For more information, please follow other related articles on the PHP Chinese website!
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