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Question

从master文件中，我以[{1}}的形式从app.component.ts获取数据，但[Object Object]给出了空白结果，当我尝试从UI访问报告网址，我收到此错误：alert(this.datas);。

有人可以提供解决方案吗？

以下是必要的文件：

app.component.ts类（摘录）

alert(this.datas.ReportDtDataForMAPP);

app.html（节选）

Cannot read property 'URL' of undefined

myMobileDataService.ts类

//...
//Lines of code
//...

this.myMobileDataService.checkAuthorization(this.enterpriseId,v2Token)
    .subscribe(
        response => {
            this.datas = response;

            JSON.stringify(this.datas);

            alert(this.datas);

            alert(this.datas.ReportDtDataForMAPP);

            if(this.datas == null || this.datas == ""){
                this.nav.setRoot(this.accessDeniedPage, {showFooter : false});
            } else {
                this.nav.setRoot(this.homePage, {showFooter : false});
            }
        },
        err => {
            console.log("Error here!:"+err);           
        }
        );

    },


//...
//Lines of code
//...

OpenReport(report : any)
{
        let list = this.datas.ReportDtDataForMAPP;
        let newList = list.filter((t) => t.SubReport == report);
        JSON.stringify(newList)
        this.myURL = newList[0].URL;
        this.openUrl(this.myURL);

}

//...
//Lines of code
//...

http post请求以这种形式提供数据：

 //...
 //Lines of code
 //...
 <ion-grid>

    <ion-row>
      <ion-col class="reportHeader reportHeaderPadding"><strong>AAA</strong></ion-col>
    </ion-row>
    <ion-row text-center>
      <ion-col (click)="OpenReport('MURLAAA')" tappable><img src = "assets/icon/AAA.png" alt = "Image Not Available" class = "homeImages"></ion-col>
      <ion-col (click)="OpenReport('MURLBBB')" tappable> <img src = "assets/icon/BBB.png" alt = "Image Not Available" class = "homeImages"></ion-col>
       <ion-col (click)="OpenReport('MURLCCC')" tappable> <img src = "assets/icon/CCC.png" alt = "Image Not Available" class = "homeImages"></ion-col>
    </ion-row>
    <ion-row text-center class="addBorder">
      <ion-col (click)="OpenReport('MURLAAA')" tappable class="reportName">AAA</ion-col>
      <ion-col (click)="OpenReport('MURLBBB')" tappable class="reportName">BBB</ion-col>
      <ion-col (click)="OpenReport('MURLCCC')" tappable class="reportName">CCC</ion-col>
    </ion-row>

    //...
    //Lines of code
    //...

Answer 1

调用此函数时：

OpenReport(report : any)
{
        let list = this.datas.ReportDtDataForMAPP;
        let newList = list.filter((t) => t.SubReport == report);
        JSON.stringify(newList)
        this.myURL = newList[0].URL;
        this.openUrl(this.myURL);

}

由于subscribe为异步：https://angular.io/guide/http

，因此未加载数据

无法读取属性＆＃39;网址＆＃39;未定义 - 访问JSON对象

1 个答案:

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