vue做一个上移和下移，删除的li 功能

Posted 2021-12-19 panax

效果图：

思路就是冒泡原理，把数据放到一个空数组，对其进行排序, 单选框用到的是iview 。

具体实现代码：

 <div v-for="item in singledLists" :key="item.index" >   // 数组singledLists
            <Checkbox @on-change="checkSingle" :disabled="isDisabled" v-model="item.isRight" class="mb10" >
                <Input  :value="item.content" v-model="item.content" style="width: 300px;marginLeft:.4rem;" />   // item.content 动态设置input
            </Checkbox>
            <span style="cursor:pointer;" @click="moveUp(item)">上移</span>
            <span style="cursor:pointer;" @click="moveDown(item)">下移</span>
            <span style="cursor:pointer;" @click="singleAnswerDelete(item)">删除</span>
</div>

<div class="ml30"><Button class=‘newColor‘ @click="addSingleAnswer" :class="‘hideButton‘:isShow" type="primary">添加选项</Button></div>  // hideButtondispaly:none 控制显示和隐藏 ,isShow:false ;

 // 添加

// 添加答案选项
        addSingleAnswer() 
          let _this = this;
          _this.singledLists.push();   // 置空
          if (_this.questionStyle === "single") 
            if (_this.singledLists.length >= 4) 
              _this.isShow = true; //隐藏按钮添加选项  
              _this.$Message.info("单选题最多添加四个选项！");
            
           else if (_this.questionStyle === "multi") 
            if (_this.singledLists.length >= 6) 
              _this.isShow = true; //隐藏按钮添加选项
              _this.$Message.info("多选题最多添加六个选项！");
            
          
        ,

 

 

// 以B为基点上移 (根据index值)
    moveUp(item) 
          console.log(item)
          console.log(this.singledLists)
          let index = this.singledLists.indexOf(item);  // 获取的index。或者通过v-for 遍历传过的index，可以简化此步骤。
          if (this.singledLists.length > 1 && index !== 0) 
            var temp = this.singledLists[index - 1].content;      // 这三行的含义可见上面示意图
            this.singledLists[index - 1].content = this.singledLists[index].content;
            this.singledLists[index].content = temp;
          
     ,

// 下移
        moveDown(item) 
          let index = this.singledLists.indexOf(item);
          if( this.singledLists.length > 1 && index != this.singledLists.length - 1 ) 
            var temp = this.singledLists[index + 1].content;     // 以c为基点
            this.singledLists[index + 1].content = this.singledLists[index].content;
            this.singledLists[index].content = temp;
          
        ,
        // 删除
        singleAnswerDelete(item) 
          this.isShow = false;
          let index = this.singledLists.indexOf(item);
          if (index > -1) 
            this.singledLists.splice(index, 1);
          
        ,