How to implement image drag and drop function in uniapp

How to implement the image dragging function in uniapp

In uniapp, we can implement the image dragging function by using the uni-dragger component. The uni-dragger component is a draggable container component provided by uniapp, which can be used to implement drag-and-drop movement of elements.

First, we need to introduce the uni-dragger component into the page. Add the following code to the template:

<template>
  <view>
    <uni-dragger class="drag-wrapper">
      <image src="../assets/image.jpg" class="drag-image"></image>
    </uni-dragger>
  </view>
</template>

In the above code, the uni-dragger component is used and an image component is wrapped. Display the dragged image by setting the src attribute in the image component.

Next, we need to define styles for the uni-dragger and image components in the style file. Add the following code in style:

<style>
  .drag-wrapper {
    width: 200px;
    height: 200px;
    position: relative;
  }

  .drag-image {
    width: 100%;
    height: 100%;
  }
</style>

In the above code, we set the width and height of the drag-wrapper component and position it relative (position: relative). At the same time, the width and height of the drag-image component are set to 100%.

Through the above steps, we have implemented the configuration of the drag-and-drop container and style of the image. Next, we need to add drag event processing logic to the image.

Add the following code to the script:

<script>
  export default {
    methods: {
      onDragStart(event) {
        // 拖拽开始时触发
        console.log("drag start", event);
      },
      onDragMove(event) {
        // 拖拽过程中触发
        console.log("drag move", event);
      },
      onDragEnd(event) {
        // 拖拽结束时触发
        console.log("drag end", event);
      },
    },
  };
</script>

In the above code, we defined three methods onDragStart, onDragMove and onDragEnd, respectively at the beginning of dragging, during dragging and dragging. Triggered when the pull ends. Output the drag and drop event information through console.log, and we can view the corresponding drag and drop information on the console.

Finally, bind the method to the event of the uni-dragger component. Add the following code to the template:

<template>
  <view>
    <uni-dragger class="drag-wrapper"
      @dragstart="onDragStart"
      @dragmove="onDragMove"
      @dragend="onDragEnd"
    >
      <image src="../assets/image.jpg" class="drag-image"></image>
    </uni-dragger>
  </view>
</template>

Bind the corresponding methods through the @dragstart, @dragmove and @dragend events to implement the drag and drop function of the image. When a drag event is triggered, the corresponding method will be called and the drag event information will be output.

Through the above steps, we have implemented the drag-and-drop function of images in uniapp. Images can be moved freely on the page by dragging them.

To sum up, we can implement the drag-and-drop function of images by using the uni-dragger component and corresponding event processing logic. The above is a simple example that can be expanded and modified according to actual needs. I hope this article can help you understand how to implement the image drag and drop function in uniapp.

The above is the detailed content of How to implement image drag and drop function in uniapp. For more information, please follow other related articles on the PHP Chinese website!