Ionic2+angular4地区选择组件

摘要：最近在项目重构的过程中，发现之前用写的地区选择指令在中很难重用毕竟是用。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。

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。
https://www.npmjs.com/package...
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。
具体代码如下：
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; // 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
     * 2. 先把数据处理成省市区分开的数组
     * 3. 将数据以列的形式给到picker
     * 4. 设置数据显示样式（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, 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);
    }

    /**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, 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;
    }

    /**
     *  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

  地区选择

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");
    } 
}

没有地区数据json或ts的文件可以去这里获取
http://pan.baidu.com/s/1eRUJiXO