利用Ionic2 + angular4实现一个地区选择组件

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前言

本文主要给大家介绍的是关于利用Ionic2 + angular4实现一个地区选择组件的相关内容,为什么会有这篇文章?主要是因为最近在项目重构的过程中,发现之前用mobiscroll写的地区选择指令在angular2中很难重用(毕竟是用typeScript)。于是就萌生了自己写一个组件的想法。

想和之前一样基于mobiscroll去写,但是发现非常耗费精力,于是某日万般无奈这下搜了一下相关的组件,不出所料已经有人写了。...但是此组件并不符合我的要求。我不是单纯的选择省市区,还可能是选择省市或者省。于是参照此项目基于ionic2的picker写了一个公用组件。下面话不多说了,感兴趣的朋友们下面来一起看看详细的介绍:

具体代码如下:

AreasSelect.ts

@Component({
selector: 'areas-select',templateUrl: 'areasSelect.com.html',})
export class AreasSelect {
constructor(protected Picker: PickerController) {
}
private picker;
private provinceCol = 0; // 省列
private cityCol = 0; // 市列
private regionCol = 0; // 区列
private pickerColumnCmps; // picker纵列数据实例
private isOpen = false; // 是否被创建
private pickerCmp; // picker 实例
private value = ''; // 选中后的数据
@Input() citiesData = areasList; // 地区数据(默认为areas.ts的数据)
@Input() cancelText = '关闭'; // 关闭按钮文本
@Input() doneText = '完成'; // 完成按钮文本
@Input() separator = ''; // 数据衔接模式
@Input() level = 3; // 等级设置 最高为三级
/**

  • 关闭时触发的事件
  • 没有值返回
  • @type {EventEmitter}
    */
    @Output() cancel: EventEmitter = new EventEmitter(); // 关闭事件
    /**
  • 完成时触发的事件
  • 返回值为obj
  • obj = {data: object,value: string} data为对应的省市区和编码
  • @type {EventEmitter}
    */
    @Output() done: EventEmitter = new EventEmitter(); // 完成事件
    /**
  • 打开地区选择器
  • 基本思路
  • 1.创建picker
    1. 先把数据处理成省市区分开的数组
    1. 将数据以列的形式给到picker
    1. 设置数据显示样式(picker)
    1. 生成picker
      */
      private open() {
      let pickerOptions = {
      buttons: [
      {
      text: this.cancelText,role: 'cancel',handler:() => {
      this.cancel.emit(null);
      }
      },{
      text: this.doneText,handler: (data) =>{
      this.onChange(data);
      this.done.emit({
      data: data,value: this.value
      });
      }
      }
      ]
      };
      this.picker = this.Picker.create(pickerOptions);
      this.generate();// 加载
      this.validate(this.picker); // 渲染
      this.picker.ionChange.subscribe(() => {
      this.validate(this.picker);
      });
      // 生成
      this.picker.present(pickerOptions).then(() => {
      this.pickerCmp = this.picker.instance;
      this.pickerColumnCmps = this.pickerCmp._cols.toArray();
      this.pickerColumnCmps.forEach(function (col) {
      return col.lastIndex = -1;
      });
      });
      this.isOpen = true;
      this.picker.onDidDismiss(function () {
      this.isOpen = false;
      });
      }

/** 对数据进行处理,并移交给picker

  • */
    private generate() {
    let values = this.value.toString().split(this.separator);
    // Add province data to picker
    let provinceCol = {
    name: 'province',options: this.citiesData.map(function (province) {
    return {text: province.name,value: province.code,disabled: false};
    }),selectedIndex: 0
    };
    let provinceIndex = this.citiesData.findIndex(function (option) {
    return option.name == values[0];
    });
    provinceIndex = provinceIndex === -1 ? 0 : provinceIndex;
    provinceCol.selectedIndex = provinceIndex;
    this.picker.addColumn(provinceCol);
    // Add city data to picker
    let cityColData = this.citiesData[provinceCol.selectedIndex].children;
    let cityCol;

if (this.level >= 2) {
cityCol = {
name: 'city',options: cityColData.map(function (city) {
return {text: city.name,value: city.code,selectedIndex: 0
};
let cityIndex = cityColData.findIndex(function (option) {
return option.name == values[1];
});
cityIndex = cityIndex === -1 ? 0 : cityIndex;
cityCol.selectedIndex = cityIndex;
this.picker.addColumn(cityCol);
}
// Add region data to picker
let regionData,regionCol;

if (this.level === 3) {
regionData = this.citiesData[provinceCol.selectedIndex].children[cityCol.selectedIndex].children;
regionCol = {
name: 'region',options: regionData.map(function (city) {
return {text: city.name,selectedIndex: 0
};
let regionIndex = regionData.findIndex(function (option) {
return option.name == values[2];
});
regionIndex = regionIndex === -1 ? 0 : regionIndex;
regionCol.selectedIndex = regionIndex;
this.picker.addColumn(regionCol);
}
this.divyColumns(this.picker);
}

/**设置数据显示样式

  • @param picker
    /
    private divyColumns(picker) {
    let pickerColumns = this.picker.getColumns(); // 获取列数据
    let columns = [];
    pickerColumns.forEach(function (col,i) {
    columns.push(0);
    col.options.forEach(function (opt) {
    if (opt && opt.text && opt.text.length > columns[i]) {
    columns[i] = opt.text.length;
    }
    });
    });
    if (columns.length === 2) {
    let width = Math.max(columns[0],columns[1]);
    pickerColumns[0].align = 'right';
    pickerColumns[1].align = 'left';
    pickerColumns[0].optionsWidth = pickerColumns[1].optionsWidth = width
    17 + "px";
    }
    else if (columns.length === 3) {
    let width = Math.max(columns[0],columns[2]);
    pickerColumns[0].align = 'right';
    pickerColumns[1].columnWidth = columns[1] 33 + "px";
    pickerColumns[0].optionsWidth = pickerColumns[2].optionsWidth = width
    17 + "px";
    pickerColumns[2].align = 'left';
    }
    }

/**

  • 验证数据
  • @param picker
    */
    private validate(picker) {
    let _this = this;
    let columns = picker.getColumns();
    let provinceCol = columns[0];
    let cityCol = columns[1];
    let regionCol = columns[2];
    if (cityCol && this.provinceCol != provinceCol.selectedIndex) {
    cityCol.selectedIndex = 0;
    let cityColData = this.citiesData[provinceCol.selectedIndex].children;
    cityCol.options = cityColData.map(function (city) {
    return {text: city.name,disabled: false};
    });
    if (this.pickerColumnCmps && cityCol.options.length > 0) {
    setTimeout(function () {
    return _this.pickerColumnCmps[1].setSelected(0,100);
    },0);
    }
    }
    if (regionCol && (this.cityCol != cityCol.selectedIndex || this.provinceCol != provinceCol.selectedIndex)) {
    let regionData = this.citiesData[provinceCol.selectedIndex].children[cityCol.selectedIndex].children;
    regionCol.selectedIndex = 0;
    regionCol.options = regionData.map(function (city) {
    return {text: city.name,disabled: false};
    });
    if (this.pickerColumnCmps && regionCol.options.length > 0) {
    setTimeout(function () {
    return _this.pickerColumnCmps[2].setSelected(0,0);
    }
    }
    this.provinceCol = provinceCol.selectedIndex;
    this.cityCol = cityCol ? cityCol.selectedIndex : 0;
    this.regionCol = regionCol ? regionCol.selectedIndex : 0;
    }

/**

  • 设置value
  • @param newData
    */
    private setValue(newData) {
    if (newData === null || newData === undefined) {
    this.value = '';
    }
    else {
    this.value = newData;
    }
    }

/**

  • 获取value值
  • @returns {string}
    */
    private getValue() {
    return this.value;
    }

/**

  • 改变value值的显示
  • @param val
    */
    private onChange(val) {
    this.setValue(this.getString(val));
    }

/**

  • 获取当前选择的地区数据
  • @param newData
  • @returns {string}
    */
    private getString(newData) {
    if (newData['city']) {
    if (newData['region']) {
    return "" + newData['province'].text + this.separator + (newData['city'].text || '') + this.separator + (newData['region'].text || '');
    }
    return "" + newData['province'].text + this.separator + (newData['city'].text || '');
    }
    return "" + newData['province'].text;
    }
    }

areasSelect.com.html

其实是不需要对应的template的,但是为了能和父级传参,这里创建了一个空的template

具体用法:

在需要用到的页面调用

test.page.html

test.page.ts

@Component({
templateUrl: 'test.page.html',styles: []
})
export class TestPage extends BasePage {
constructor(protected rt: ElementRef,protected ij: Injector) {
super(rt,ij);
}
@ViewChild('areasSelect') areasSelect;
showAreasSelect() {
this.areasSelect.open();
}
done(data) {
this.showAlert(JSON.stringify(data));
}
closeSelect() {
this.showAlert('you click close');
}
}

没有地区数据json或ts的文件可以去这里获取:

总结

以上就是这篇文章的全部内容了,希望本文的内容对大家的学习或者工作能带来一定的帮助,如果有疑问大家可以留言交流,谢谢大家对编程之家的支持

原文链接:https://www.f2er.com/js/37542.html

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