iview tree 不可拖放，好在有render属性，可以自己写。

最新推荐文章于 2024-09-26 10:56:33 发布

原创最新推荐文章于 2024-09-26 10:56:33 发布 · 3.7k 阅读

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#iview #tree #拖放

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本文介绍了一种使用IView UI库实现树形结构中节点拖放功能的方法。通过在模板中添加dragstart、dragover、dragend、drop等事件，实现了树形节点的动态拖放与重组。文章提供了详细的代码示例，包括如何处理拖放开始、进行、结束及放置事件，以及如何更新数据结构以反映拖放操作。

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基于iview的树项拖放（代码还有很多可以完善的细节）：

render中添加拖放事件dragstart、dragover、dragend、drop

<template>
  <div>
    <Tree :data="data5" :render="renderContent" ></Tree>
  </div>
</template>
<script>
    export default {
        data () {
            return {
                data5: [
                    {
                        title: 'parent 1',
                        expand: true,
                        children: [
                            {
                                title: 'parent 1-1',
                                expand: true,
                                children: [
                                    {
                                        title: 'leaf 1-1-1'
                                    },
                                    {
                                        title: 'leaf 1-1-2'
                                    }
                                ]
                            },
                            {
                                title: 'parent 1-2',
                                expand: true,
                                children: [
                                    {
                                        title: 'leaf 1-2-1'
                                    },
                                    {
                                        title: 'leaf 1-2-1'
                                    }
                                ]
                            }
                        ]
                    }
                ],
                buttonProps: {
                    type: 'default',
                    size: 'small',
                },
                dragstartNode:'',
                dragstartData:'',
            }
        },
        mounted(){
        },
        methods: {
            renderContent (h, { root, node, data }) {
                return h('span', {
                    style: {
                        display: 'inline-block',
                        width: '100%'
                    },
                    attrs: {
                      draggable:'true'
                    },
                    on:{
                      dragstart: () => this.handleDragStart(root, node, data),
                      dragover: () => this.handleDragOver(root, node, data),
                      dragend: () => this.handleDragEnd(root, node, data),
                      drop: ()=> this.handleDrop(root, node, data),
                    }
                }, [
                    h('span', [
                        h('Icon', {
                            props: {
                                type: 'ios-paper-outline'
                            },
                            style: {
                                marginRight: '8px'
                            }
                        }),
                        h('span', data.title)
                    ]),
                    h('span', {
                        style: {
                            display: 'inline-block',
                            marginRight: '32px',
                            marginLeft: '10px'
                        }
                    }, [
                        h('Button', {
                            props: Object.assign({}, this.buttonProps, {
                                icon: 'ios-create',
                                shape : "circle"
                            }),
                            style: {
                                marginRight: '8px'
                            },
                            on: {
                                click: () => { this.append(data) }
                            }
                        }),
                        h('Button', {
                            props: Object.assign({}, this.buttonProps, {
                                icon: 'ios-remove',
                                shape : "circle"
                            }),
                            on: {
                                click: () => { this.remove(root, node, data) }
                            }
                        })
                    ])
                ]);
            },
            append (data) {
                const children = data.children || [];
                children.push({
                    title: 'appended node',
                    expand: true
                });
                this.$set(data, 'children', children);
            },
            remove (root, node, data) {
                const parentKey = root.find(el => el === node).parent;
                const parent = root.find(el => el.nodeKey === parentKey).node;
                const index = parent.children.indexOf(data);
                parent.children.splice(index, 1);
            },
            handleDragStart(root, node, data){
              const event = window.event||arguments[0];
              this.dragstartNode = node
              this.dragstartData = data
            },
            handleDragOver(root, node, data){
              const event = window.event||arguments[0];
              event.preventDefault();

            },
            handleDragEnd(root, node, data){
              const event = window.event||arguments[0];
              event.preventDefault();
            },
            handleDrop(root, node, data){
              event.preventDefault();
              if(node === this.dragstartNode) return
              const target_parentKey = root.find(el => el === node).parent;
              const target_parent = root.find(el => el.nodeKey === target_parentKey).node;
              const target_index = target_parent.children.indexOf(data);
              const target_children = data.children || [];
              target_children.push(this.dragstartData);
              this.$set(data, 'children', target_children);

              const source_parentKey = root.find(el => el === this.dragstartNode).parent;
              const source_parent = root.find(el => el.nodeKey === source_parentKey).node;
              const source_index = source_parent.children.indexOf(this.dragstartData);
              source_parent.children.splice(source_index, 1);
              console.log(this.data5,"data5")
            },
        }
    }
</script>

运行结果：