IT俱乐部 JavaScript 前端实现界面元素拖拽功能的3种方式总结(亲测有效)

前端实现界面元素拖拽功能的3种方式总结(亲测有效)

发布: 2025年 3月 9日 206阅读

目录

一、纯HTML+CSS+JS实现；

  <title>Document</title><div id="draggableDialog">
    <div class="dialog-header">弹框标题</div>
    <div class="dialog-content">弹框内容</div>
</div>
 
 
  #draggableDialog {
    position: absolute;
    width: 300px;
    height: 200px;
    background-color: #fff;
    border: 1px solid #ccc;
    padding: 10px;
}
.dialog-header {
    cursor: move;
    background-color: #f0f0f0;
    padding: 5px;
}
 
const dialog = document.getElementById('draggableDialog');
const dialogHeader = dialog.querySelector('.dialog-header');
let isDragging = false;
let offsetX, offsetY;
dialogHeader.addEventListener('mousedown', (e) => {
    isDragging = true;
    offsetX = e.clientX - dialog.offsetLeft;
    offsetY = e.clientY - dialog.offsetTop;
});
document.addEventListener('mousemove', (e) => {
    if (isDragging) {
        dialog.style.left = e.clientX - offsetX + 'px';
        dialog.style.top = e.clientY - offsetY + 'px';
    }
});
document.addEventListener('mouseup', () => {
    isDragging = false;
});

实现原理：使用js事件监听，监听document全局DOM的鼠标移动事件，当触发事件后，目标元素将会随鼠标一起偏移(移动)相对应的距离；因目标元素并非一直需要跟随鼠标移动，于是通过给目标元素指定区域dialogHeader 添加鼠标按下事件配合isDragging控制阀，实现只有当鼠标在指定区域按下才能实现拖动目标元素的效果。

二、VUE模板实现；

<div id="draggableDialog">
    <div class="dialog-header">弹框标题</div>
    <div class="dialog-content">弹框内容</div>
  </div>
 
export default {
  data() {
    return {
      isDragging: false,
      offsetX: 0,
      offsetY: 0
    };
  },
  methods: {
    startDrag(event) {
      this.isDragging = true;
      this.offsetX = event.clientX - this.$refs.dialog.offsetLeft;
      this.offsetY = event.clientY - this.$refs.dialog.offsetTop;
      document.addEventListener('mousemove', this.drag);
      document.addEventListener('mouseup', this.stopDrag);
    },
    drag(event) {
      if (this.isDragging) {
        this.$refs.dialog.style.left = event.clientX - this.offsetX + 'px';
        this.$refs.dialog.style.top = event.clientY - this.offsetY + 'px';
      }
    },
    stopDrag() {
      this.isDragging = false;
      document.removeEventListener('mousemove', this.drag);
      document.removeEventListener('mouseup', this.stopDrag);
    }
  }
};
 
#draggableDialog {
  position: absolute;
  width: 300px;
  height: 200px;
  background-color: #fff;
  border: 1px solid #ccc;
  padding: 10px;
}
  
.dialog-header {
  cursor: move;
  background-color: #f0f0f0;
  padding: 5px;
}

原理同上；

三、VUE全局指令实现；

Vue.directive('drag', {
    bind(el) {
        el.onmousedown = function(e) {
            let disX = e.clientX - el.offsetLeft;
            let disY = e.clientY - el.offsetTop;
            document.onmousemove = function(e) {
                let left = e.clientX - disX;
                let top = e.clientY - disY;
                if (left  document.documentElement.clientWidth - el.offsetWidth) left = document.documentElement.clientWidth - el.offsetWidth;
                if (top > document.documentElement.clientHeight - el.offsetHeight) top = document.documentElement.clientHeight - el.offsetHeight;
                el.style.left = left + 'px';
                el.style.top = top + 'px';
            };
            document.onmouseup = function() {
                document.onmousemove = null;
                document.onmouseup = null;
            };
        };
    }
});

总结

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标签:亲测元素前端拖拽界面