angular - iFrame validation http get SRC -


as have read before, cannot validate if iframe loaded, not loaded or still loading in chrome using onerror or onload functions, decided test url provided src iframe using simple http get.

i start loading iframe specific url, , check url @ same time using http get. if http returns 200 ok, means iframe loaded correctly hide error message (this.iframestatus = false;). if http returns error, should change iframe url , show error message (this.iframestatus = true;).

component

export class statuscomponent implements oninit {   public iframeurl: any;   public iframe: any;   public iframestatus: boolean = false;   public counter: number = 0;    public errormessage: any;   //assign url iframe in constructor   constructor(private _sanitizer: domsanitizer, public _element: elementref, private _verificationservice: verificationservice) {     this.iframeurl = this._sanitizer.bypasssecuritytrustresourceurl(constant.url);     settimeout(() => {       this.iframestatusverification();     }, 3000);   }    //verify if iframe correctly loaded   ngafterviewinit() {     this.iframe = this._element.nativeelement.queryselector('.iframe');   }    iframestatusverification() {     this._verificationservice.getappstatus().subscribe(       data => {         console.log('success', data);         this.iframestatus = false;         this.iframeurl = this._sanitizer.bypasssecuritytrustresourceurl(constant.url);       },       error => {         error => this.errormessage = <any>error         console.log('error', error);         console.log('error status', error.status);         console.log('error ok', error.ok);          this.iframestatus = true;         //this.iframe.src = constant.emptyiframe;         this.iframeurl = this._sanitizer.bypasssecuritytrustresourceurl(constant.emptyiframe);        }     );   }    ngoninit() {   }  }

service

@injectable() export class verificationservice {   //external app iframe verification   getappstatus(): observable<string[]> {     let url = constant.localserver + constant.url;     console.log(url);     return this.http.get(url, this._requestoptions)       .timeout(5000)       .map(res => { let body = res.json(); return body; })       .catch((err: any): => {         this.handleerror(err, 'error app not found ');         //return observable.of(err);       });   }    handleerror(err: any, message: string) {     let errmsg = (err.message) ? err.message :       err.status ? `${err.status} - ${err.statustext}` : 'server error';     console.error(errmsg); // log console instead     return observable.of(err);    } }

this._requestoptionsare injected service header options cross origin properties.

the iframe loaded, receive 200 ok url error message shown , src changed.

i try print error status or message in component (console.log('error status', error.status);) undefined. idea why ?

you should use httperrorresponse check possible failures external api.

how use it?

import { httperrorresponse } '@angular/common/http';   http   .get<itemsresponse>('api url')   .subscribe(       data => {...},       (err: httperrorresponse) => {       if (err.error instanceof error) {          // client-side or network error occurred. handle accordingly.         console.log('an error occurred:', err.error.message);        } else {          // backend returned unsuccessful response code.         // response body may contain clues went wrong,         console.log(`backend returned code ${err.status}, body was: ${err.error}`);       }     }   });

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