Ionic2+angular4地區選擇組件

最近在項目重構的過程當中，發現以前用mobiscroll寫的地區選擇指令在angular2中很難重用（畢竟是用typeScript）。因而就萌生了本身寫一個組件的想法。
想和以前同樣基於mobiscroll去寫，可是發現很是耗費精力，因而某日萬般無奈這下搜了一下相關的組件，不出所料已經有人寫了。
https://www.npmjs.com/package...
可是此組件並不符合個人要求。
我不是單純的選擇省市區，還多是選擇省市或者省。因而參照此項目基於ionic2的picker寫了一個公用組件。
具體代碼以下：
AreasSelect.ts

import {PickerController} from "ionic-angular";
import {Component, EventEmitter, Output, Input} from "@angular/core";
import {areasList} from "../../datasource/areas";

@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; // 區列
    private pickerColumnCmps; // picker縱列數據實例
    private isOpen = false; //  是否被建立
    private pickerCmp; // picker 實例
    private value = ''; // 選中後的數據
    @Input() citiesData = areasList;　// 地區數據(默認爲areas.ts的數據)
    @Input() cancelText = '關閉'; // 關閉按鈕文本
    @Input() doneText = '完成'; // 完成按鈕文本
    @Input() separator = ''; // 數據銜接模式
    @Input() level = 3; // 等級設置 最高爲三級
    /**
     *  關閉時觸發的事件
     *  沒有值返回
     * @type {EventEmitter}
     */
    @Output() cancel: EventEmitter<any> = new EventEmitter(); // 關閉事件
    /**
     *  完成時觸發的事件
     *  返回值爲obj
     *  obj = {data: object,value: string} data爲對應的省市區和編碼
     * @type {EventEmitter}
     */
    @Output() done: EventEmitter<any> = new EventEmitter(); // 完成事件
    /**
     *  打開地區選擇器
     *  基本思路
     *  1.建立picker
     * 2. 先把數據處理成省市區分開的數組
     * 3. 將數據以列的形式給到picker
     * 4. 設置數據顯示樣式（picker）
     * 5. 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();// 加載
        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;
        });
    }

    /** 對數據進行處理，並移交給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, disabled: false};
                }),
                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, value: city.code, disabled: false};
                }),
                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);
    }

    /**設置數據顯示樣式
     * @param picker
     */
    private divyColumns(picker) {
        let pickerColumns = this.picker.getColumns(); // 獲取列數據
        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';
        }
    }

    /**
     * 驗證數據
     * @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, value: city.code, 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, value: city.code, disabled: false};
            });
            if (this.pickerColumnCmps && regionCol.options.length > 0) {
                setTimeout(function () {
                    return _this.pickerColumnCmps[2].setSelected(0, 100);
                }, 0);
            }
        }
        this.provinceCol = provinceCol.selectedIndex;
        this.cityCol = cityCol ? cityCol.selectedIndex : 0;
        this.regionCol = regionCol ? regionCol.selectedIndex : 0;
    }

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

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

    /**
     *  改變value值的顯示
     * @param val
     */
    private onChange(val) {
        this.setValue(this.getString(val));
    }

    /**
     *  獲取當前選擇的地區數據
     * @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
實際上是不須要對應的template的，可是爲了能和父級傳參，這裏建立了一個空的template

<div></div>

具體用法：
在須要用到的頁面調用
test.page.html

<ion-content>
  <button ion-button block icon-left color="light" (tap)="showAreasSelect()">地區選擇</button>
</ion-content>
<areas-select #areasSelect [level]="3" (cancel)="closeSelect()" (done)="done($event)"></areas-select>

test.page.ts

import {Component, ElementRef, Injector, ViewChild} from "@angular/core";
import {BasePage} from "../base.page";

@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');
    } 
}

沒有地區數據json或ts的文件能夠去這裏獲取
http://pan.baidu.com/s/1eRUJiXO