uniapp 三级地区选择组件 selectAddress pick-xxx的使用

阳光穿透心脏的1/2处 2021-07-25 11:58 344阅读 0赞

### 三级地区选择 ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3llaGFvY2hlbmc1MjA_size_16_color_FFFFFF_t_70]  
功能要求如下：

1.  点击 可以弹出选择组件，选择地区后，会显示在界面上
2.  接收到地区code后，可以根据地区code查找到对应的地区名称，进行展示。

此功能实现时，利用了一个封装好的组件 selectAddress ，后面会放出代码。

#### 界面部分 ####

<view class="row b-b">
    	<text class="tit">地址</text>
    	// disableFlag: 是否禁用 defaultRegion：默认的地区 @getRegion 选择地区的函数
    	<pick-regions :disableFlag="disableFlag" :defaultRegion="defaultRegion" @getRegion="handleGetRegion" class="input">
    	       <text v-if='regionName'>{ { regionName}}</text>
    		   <text style="color: #999;" v-else>省 / 市 / 区</text>
    	</pick-regions>
    	<text style="color: #999;" class="icon iconfont icon-you-copy"></text>
    </view>

#### script数据部分 ####

// 引入地区列表json文件
    const CHINA_REGIONS = require('@/components/regions.json')
    data(){ 
    	return{ 
    		defaultRegion:['浙江省','杭州市','拱墅区'],
    		defaultRegionCode:'130102',
    		disableFlag:false,
    		region:[]
    	}
    },
    computed:{ 
    	regionName(){ 
    		let addr = ""
    		this.region.forEach(item=>{ 
    			addr += `${ item} `;
    		})
    		return addr;
    	}
    },
    methods:{ 
    	 // 获取选择的地区
    	handleGetRegion(region){ 
    		this.region = [];
    		region.forEach((item)=>{ 
    			this.region.push(item.name);
    		})
    		console.log(region);
    		// 以下是地区code的存储
    		this.userInfo.regionId = region[region.length - 1].code;
    	},
    	// 根据地区code获取地区名称
    	getAddr(row) { 
          let code = row;
    	  this.region = [];
          if (code) { 
            let provinceCode = code.slice(0, 2);
            let cityCode = code.slice(2, 4);
            let areaCode = code.slice(4, 6);
            let addr = "";
            CHINA_REGIONS.forEach(item => { 
              if (item.code.slice(0, 2) === provinceCode) { 
                addr += item.name;
    			this.region.push(item.name);
                item.childs.forEach(item2 => { 
                  if (item2.code.slice(2, 4) === cityCode) { 
                    addr += item2.name;
    				this.region.push(item2.name);
                    item2.childs.forEach(item3 => { 
                      if (item3.code.slice(4, 6) === areaCode) { 
                        addr += item3.name;
    					this.region.push(item3.name);
                      }
                    });
                  }
                });
    			this.defaultRegion = this.region;
              }
            });
          }
        }
    }

#### selectAddress组件 ####

<template>
        <picker mode="multiSelector" 
                :value="multiIndex" 
                :range="multiArray" 
                @change="handleValueChange"
                @columnchange="handleColumnChange" :disabled="disabledFlag">
            <slot></slot>
        </picker>
    </template>
    
    <script>
        const CHINA_REGIONS = require('./regions.json')
    	export default { 
            props:{ 
                defaultRegions:{ 
                    type:Array,
                    default(){ 
                        return []
                    }
                },
    			disabledFlag:{ 
    				type:Boolean,
    				default:false
    			},
                defaultRegion:[String,Array]
            },
    		data() { 
    			return { 
                    cityArr:CHINA_REGIONS[0].childs,
                    districtArr:CHINA_REGIONS[0].childs[0].childs,
                    multiIndex: [0,0,0],
                    isInitMultiArray:true,
    			}
    		},
            watch:{ 
                defaultRegion:{ 
                    handler(region,oldRegion){ 
                        if(Array.isArray(region)){ 
                            // 避免传的是字面量的时候重复触发
                            oldRegion = oldRegion || []
                            if(region.join('')!==oldRegion.join('')){ 
                                this.handleDefaultRegion(region)
                            }
                        }else if(region&&region.length == 6){ 
                            this.handleDefaultRegion(region)
                        }else{ 
                            console.warn('defaultRegion非有效格式')
                        }
                    },
                    immediate:true,
                }
            },
            computed:{ 
                multiArray(){ 
                    return this.pickedArr.map(arr=>arr.map(item=>item.name))
                },
                pickedArr(){ 
                    // 进行初始化
                    if(this.isInitMultiArray){ 
                        return [
                            CHINA_REGIONS,
                            CHINA_REGIONS[0].childs,
                            CHINA_REGIONS[0].childs[0].childs
                        ]
                    }
                    return [CHINA_REGIONS,this.cityArr,this.districtArr];
                }
            },
    		methods: { 
                handleColumnChange(e){ 
                    this.isInitMultiArray = false;
                    const that = this;
                    let col = e.detail.column;
                    let row = e.detail.value;
                    that.multiIndex[col] = row;
                    try{ 
                        switch(col){ 
                            case 0:
                                if(CHINA_REGIONS[that.multiIndex[0]].childs.length==0){ 
                                    that.cityArr = that.districtArr = [CHINA_REGIONS[that.multiIndex[0]]]
                                    break;
                                }
                                that.cityArr = CHINA_REGIONS[that.multiIndex[0]].childs
                                that.districtArr = CHINA_REGIONS[that.multiIndex[0]].childs[that.multiIndex[1]].childs
                                break;
                            case 1:
                                that.districtArr = CHINA_REGIONS[that.multiIndex[0]].childs[that.multiIndex[1]].childs
                                break;
                            case 2:
                                break;
                        }
                    }catch(e){ 
                        // console.log(e);
                        that.districtArr = CHINA_REGIONS[that.multiIndex[0]].childs[0].childs
                    }
                    
                },
                handleValueChange(e){ 
                    // 结构赋值
                    let [index0,index1,index2] = e.detail.value;
                    let [arr0,arr1,arr2] = this.pickedArr;
                    let address = [arr0[index0],arr1[index1],arr2[index2]];
                    // console.log(address);
                    this.$emit('getRegion',address)
                },
                handleDefaultRegion(region){ 
                    const isCode = !Array.isArray(region)
                    this.isInitMultiArray = false;
                    let children = CHINA_REGIONS
                    for(let i=0;i<3;i++){ 
                        for(let j=0;j<children.length;j++){ 
                           let condition = isCode?children[j].code==region.slice(0,(i+1)*2):children[j].name.includes(region[i]);
                           if(condition){ 
                               // 匹配成功进行赋值
                               children = children[j].childs;
                               if(i==0){ 
                                   this.cityArr = children
                               }else if(i==1){ 
                                   this.districtArr = children
                               }
                               this.$set(this.multiIndex,i,j)
                               break;
                           }else{ 
                               // 首次匹配失败就用默认的初始化
                               if(i==0 && j==(children.length-1)){ 
                                   this.isInitMultiArray = true;
                               }
                           }
                        }
                    }
                }
    		}
    	}
    </script>

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3llaGFvY2hlbmc1MjA_size_16_color_FFFFFF_t_70]: /images/20210725/9953f2502b6c47e78559f88143231c42.png