如何在angular2 nativescript中按顺序从listview行项目中获取所有开关控制值
我在点击按钮时使用的是模态对话框。在这种情况下,我在listview中使用开关控件 对于listview中的每一行项目,我需要执行开关控制以获取值 编辑:如何在angular2 nativescript中按顺序从listview行项目中获取所有开关控制值,angular,typescript,nativescript,angular2-nativescript,Angular,Typescript,Nativescript,Angular2 Nativescript,我在点击按钮时使用的是模态对话框。在这种情况下,我在listview中使用开关控件 对于listview中的每一行项目,我需要执行开关控制以获取值 编辑: <ListView [items]="getListData" class="list" height="160"> <ng-template let-item="item" let-myIndex="index"> <GridLayout rows="*" col
<ListView [items]="getListData" class="list" height="160">
<ng-template let-item="item" let-myIndex="index">
<GridLayout rows="*" columns="1.5*, auto, auto">
<Label row="0" col="0" class="item-name" [text]="item.category" ></Label>
<Switch row="0" col="1" [checked]="item.toggleVal" (checkedChange)="onFirstChecked($event, myIndex)"></Switch>
<Image row="0" col="2" src="res://menu_alert" stretch="none"></Image>
</GridLayout>
</ng-template>
</ListView>
public map: Map<number, boolean>;
public newFeedsList: Array<NewFeed> = [];
public constructor(private params: ModalDialogParams) {
this.map = new Map<number, boolean>();
}
public onFirstChecked(args, index: number) {
let firstSwitch = <Switch>args.object;
if(index != null && firstSwitch.checked){
this.map.set(this.newFeedsList[index].id , firstSwitch.checked);
console.log("Map :",this.map);
console.log("Map :", JSON.stringify(this.map));
} else {
}
}
export class NewFeed {
constructor(public id: number,public toggleVal : string, public title: string, public description:string, public date:string,public category:string, public imageUrl:string,public iconName:string) {}
}
app.modal.html:
<ListView [items]="getListData" class="list" height="160">
<ng-template let-item="item" let-myIndex="index">
<GridLayout rows="*" columns="1.5*, auto, auto">
<Label row="0" col="0" class="item-name" [text]="item.category" ></Label>
<Switch row="0" col="1" [checked]="item.toggleVal" (checkedChange)="onFirstChecked($event, myIndex)"></Switch>
<Image row="0" col="2" src="res://menu_alert" stretch="none"></Image>
</GridLayout>
</ng-template>
</ListView>
public map: Map<number, boolean>;
public newFeedsList: Array<NewFeed> = [];
public constructor(private params: ModalDialogParams) {
this.map = new Map<number, boolean>();
}
public onFirstChecked(args, index: number) {
let firstSwitch = <Switch>args.object;
if(index != null && firstSwitch.checked){
this.map.set(this.newFeedsList[index].id , firstSwitch.checked);
console.log("Map :",this.map);
console.log("Map :", JSON.stringify(this.map));
} else {
}
}
export class NewFeed {
constructor(public id: number,public toggleVal : string, public title: string, public description:string, public date:string,public category:string, public imageUrl:string,public iconName:string) {}
}
因此,当我在listview行项目中启用开关时,我将索引存储在数组中
发生了什么:
<ListView [items]="getListData" class="list" height="160">
<ng-template let-item="item" let-myIndex="index">
<GridLayout rows="*" columns="1.5*, auto, auto">
<Label row="0" col="0" class="item-name" [text]="item.category" ></Label>
<Switch row="0" col="1" [checked]="item.toggleVal" (checkedChange)="onFirstChecked($event, myIndex)"></Switch>
<Image row="0" col="2" src="res://menu_alert" stretch="none"></Image>
</GridLayout>
</ng-template>
</ListView>
public map: Map<number, boolean>;
public newFeedsList: Array<NewFeed> = [];
public constructor(private params: ModalDialogParams) {
this.map = new Map<number, boolean>();
}
public onFirstChecked(args, index: number) {
let firstSwitch = <Switch>args.object;
if(index != null && firstSwitch.checked){
this.map.set(this.newFeedsList[index].id , firstSwitch.checked);
console.log("Map :",this.map);
console.log("Map :", JSON.stringify(this.map));
} else {
}
}
export class NewFeed {
constructor(public id: number,public toggleVal : string, public title: string, public description:string, public date:string,public category:string, public imageUrl:string,public iconName:string) {}
}
现在我无法在控制台中打印哈希映射。它在控制台中显示Map:[对象映射]
我需要什么:
<ListView [items]="getListData" class="list" height="160">
<ng-template let-item="item" let-myIndex="index">
<GridLayout rows="*" columns="1.5*, auto, auto">
<Label row="0" col="0" class="item-name" [text]="item.category" ></Label>
<Switch row="0" col="1" [checked]="item.toggleVal" (checkedChange)="onFirstChecked($event, myIndex)"></Switch>
<Image row="0" col="2" src="res://menu_alert" stretch="none"></Image>
</GridLayout>
</ng-template>
</ListView>
public map: Map<number, boolean>;
public newFeedsList: Array<NewFeed> = [];
public constructor(private params: ModalDialogParams) {
this.map = new Map<number, boolean>();
}
public onFirstChecked(args, index: number) {
let firstSwitch = <Switch>args.object;
if(index != null && firstSwitch.checked){
this.map.set(this.newFeedsList[index].id , firstSwitch.checked);
console.log("Map :",this.map);
console.log("Map :", JSON.stringify(this.map));
} else {
}
}
export class NewFeed {
constructor(public id: number,public toggleVal : string, public title: string, public description:string, public date:string,public category:string, public imageUrl:string,public iconName:string) {}
}
当我在listview行项目中单击switch时,它必须获取NewFeed id并将其切换为键和值。所以我用了地图
这样,我将id保存为键,将toggleVal保存为映射中的值。但我无法在映射中添加id和toggleVal。因此我不知道这两个值是否已添加到映射中
如果我们将单个listview行项目切换“n”次,它应该在相同的位置更改。为什么不按index=value保存它?您将得到一个值数组,如:
[
true, //index 0 is checked
false, //index 1 is unchecked
true, //index 2 is checked
... //globally index n is value
]
并将其构建为:
public onFirstChecked(args, index: number) {
let firstSwitch = <Switch>args.object;
//always assign whenever it is checked or not
Global.newFeedArr[index] = firstSwitch.checked;
}
public onFirstChecked(参数,索引:编号){
让firstSwitch=args.object;
//无论是否选中,始终分配
Global.newFeedArr[index]=firstSwitch.checked;
}
更新:
通过像您一样使用,并在检查或未检查时存储值:
public map: Map<number, boolean>;
constructor() {
this.map = new Map<number, boolean>();
}
public onFirstChecked(args, index: number) {
let firstSwitch = <Switch>args.object;
this.map.set(this. newFeedsList[index].id, firstSwitch.checked);
//this is a debug to display current entries
console.log('this.map entries are:');
this.map.forEach(function (value, key) {
console.log(key + ' = ' + value);
});
}
公共地图:地图;
构造函数(){
this.map=新映射();
}
public onfirschecked(参数,索引:编号){
让firstSwitch=args.object;
this.map.set(this.newFeedsList[index].id,firstSwitch.checked);
//这是显示当前条目的调试
log('this.map条目为:');
this.map.forEach(函数(值、键){
console.log(key+'='+值);
});
}
这类似吗?我的newFeedArr似乎是这样的:公共静态newFeedArr:Array=[]代码>我使用这个数组作为全局数组来访问任何地方。在NewFeed
单独的pojo模型类中,我有id和布尔值。所以我需要执行像[{id=true,id=false,…}]这样的键和值,每当我们在同一个listview行项目上切换控件时,它都应该采用相同的id位置。NewFeed类是如何定义的?你说[{id=true,id=false,…}],不应该[{id=true},{id=false}…]?请查看我编辑的帖子。很明显,我添加了迄今为止尝试的所有内容。我使用map类更新了答案,您将无法使用console.log获得值