uni-app: js modifies element style (width, margins)

Effect

code

1. <view>Add an refattribute on the element to get a reference to the element in JavaScript code: <view ref=" myView " id="mybox"></view>

2. Get the element reference: const viewElement = this.$refs.myView . $el;

3. Modify the element width: viewElement.style.width = '100px';

4. Modify the left margin of the element: viewElement.style.marginLeft = '20px';

<template>
	<view>
		<view ref="myView" id="mybox"></view>
	</view>
</template>

<script>
	export default {
		data() {
			return {

			};
		},
		mounted() {
		    // 获取元素引用
		    const viewElement = this.$refs.myView.$el;
		    // 修改元素宽度 
		    viewElement.style.width = '100px';
			// 修改元素左外边距
			viewElement.style.marginLeft = '20px';
		},
		methods: {

		},
	};
</script>
<style>
	#mybox {
		width: 500px;
		height: 200px; 
		border: 1px solid black;
	}
</style>

Expand

This situation may cause congestion on the mobile phone and prevent normal operation. Here is an example to solve the problem on the mobile phone.

Effect

code

<template>
	<view>
		<view id="test" ref="test">这是一个元素</view>
		<view id="text" :style="{ marginTop: marginTop + 'px' }">被修改内容</view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
				query: null, // 声明查询选择器对象
				marginTop: 0, // 子元素的外边距
			};
		},
		onReady() {
			this.query = uni.createSelectorQuery(); // 创建查询选择器对象
			this.query
				.select('#test')
				.fields({
					size: true
				}, (res) => {
					const parentHeight = res.height;
					console.log('父元素的高度：' + parentHeight);
				})
				.exec(
					this.query
					.select('#text')
					.fields({
						size: true
					}, (res) => {
						const sontHeight = res.height;
						console.log('子元素的高度：' + sontHeight);
						const marginTop = sontHeight / 4; 
						this.marginTop = marginTop;
					})
				);
		},
	};
</script>

<style>
	#test {
		border: 1px solid black;
		height: 300px;
	}

	#text {
		border: 1px solid black;
		height: 200px;
	}
</style>