Various methods to implement position adjustment in Vue-Front-end Q&A-php.cn

Various methods to implement position adjustment in Vue

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Release： 2023-04-13 11:01:16

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Vue is a popular JavaScript framework that is widely used in front-end development. In Vue development, it is often necessary to adjust the position of components. This article will introduce how to adjust the position in Vue.

There are many methods to implement position adjustment in Vue, including CSS styles, transitions, parent-child relationships between components, and tools such as vue-draggable officially provided by Vue. Below we introduce these methods respectively.

Use CSS styles to adjust the position

In Vue, you can use CSS’s position and top / bottom / left / right properties to adjust the position of the component. This method can flexibly control the position of elements and supports absolute positioning, fixed positioning, and relative positioning. The following is a sample code that can move an element 20 pixels to the right:

<template>
  <div class="box">
    <p>这是一个文本框。</p>
  </div>
</template>

<style>
.box {
  position: relative;
  left: 20px;
}
</style>

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In the above code, the .box class sets relative positioning, and the left attribute is set 20px means moving 20 pixels to the right.

In addition to the position and top / bottom / left / right properties, you can also Adjust elements using the margin and padding properties. I won’t go into details here.

Using transition animation

Vue provides the transition component to achieve transition animation effects, which can well optimize changes in component position. By using the transition component, we can create a smooth transition effect when elements appear, disappear, or change their position.

The following is a simple sample code:

<template>
  <transition name="slide">
    <div v-if="show">
      这是一个文本框。
      <button @click="toggle">隐藏文本框</button>
    </div>
  </transition>
</template>

<script>
export default {
  data: function () {
    return {
      show: true
    };
  },
  methods: {
    toggle: function () {
      this.show = !this.show;
    }
  }
};
</script>

<style>
.slide-enter,
.slide-leave-to {
  transform: translateX(100%);
}

.slide-enter-active,
.slide-leave-active {
  transition: transform 0.5s;
}
</style>

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In the above code, we use Vue's transition component and specify the transition effect as slide. The transform transformation when entering and leaving is defined in the slide class to make the element translate 100% along the X-axis. In the slide-enter-active and slide-leave-active classes, the transition animation effect is defined, and the transform transformation is completed within 0.5s.

Use the parent-child relationship between components

In Vue, the nested relationship between components is very flexible, and position adjustment can be achieved through the parent-child relationship. The following is a simple sample code:

<template>
  <div>
    <my-box v-bind:x="30" v-bind:y="50" />
    <my-box v-bind:x="80" v-bind:y="100" />
  </div>
</template>

<script>
import MyBox from "./MyBox.vue";

export default {
  components: {
    MyBox
  }
};
</script>

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In the above code, we define a parent component and nest two identical subcomponents MyBox in it, and pass them in respectively their relative positions. MyBoxThe component receives the x and y parameters passed in by the parent component and applies them to the component:

<template>
  <div v-bind:style="{position: &#39;relative&#39;, left: x+&#39;px&#39;, top: y+&#39;px&#39;}">
    <p>这是一个文本框。</p>
  </div>
</template>

<script>
export default {
  props: ["x", "y"]
};
</script>

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In the above code, we use # The ##v-bind directive applies the x and y parameters passed in by the parent component to the

element where the component is located, thereby achieving Position adjustment.

Use vue-draggable tool

vue-draggable is a drag-and-drop component tool officially provided by Vue, which can easily implement drag and reorder functions. vue-draggable provides a very rich API and callback functions to meet the needs of various complex scenarios.

The following is a simple sample code:

<template>
  <draggable v-model="list">
    <div v-for="(item,index) in list" v-bind:key="item.id">
      <p>{{ item.text }}</p>
    </div>
  </draggable>
</template>

<script>
import draggable from 'vuedraggable'

export default {
  components: {
    draggable
  },
  data() {
    return {
      list: [
        { id: 1, text: '第1个文本', },
        { id: 2, text: '第2个文本', },
        { id: 3, text: '第3个文本', },
        { id: 4, text: '第4个文本', },
      ]
    }
  }
}
</script>

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In the above code, we use the vue-draggable component and bind the

list array to the component. listThe array contains 4 objects, each object represents a text. Among them, the id attribute is required and is used to specify the unique identification of each text.

In the component's template, we use

v-for to loop through each text and associate the id value of each text. When the user drags any text on the page, the list array will automatically update and maintain the new order.

The above are the four methods to achieve position adjustment in Vue. Developers can choose the most appropriate method to meet the needs according to specific scenarios.

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