Question

我注意到在能够检索结果和创建以及IndexedDB objectStore的填充之间存在相当大的延迟。我怀疑在完成大量“put”之后索引仍在运行，但我不确定如何测量每个部分（createobjectStore，createIndex）并报告回来。

是否有一种简单的方法可以检查正在创建的索引是否成功？

import { Component } from '@angular/core';
import { InAppBrowser, Splashscreen } from 'ionic-native';
import { Platform } from 'ionic-angular';
import 'rxjs/Rx';

@Component({
  selector: 'page-home',
  templateUrl: 'home.html'
})
export class HomePage {

  browser: InAppBrowser;
  sysBrowser: InAppBrowser;
  urlHistory: string[] = [];
  url: string;

  constructor(public platform: Platform) {
    this.platform = platform;
    this.url = 'http://www.yourdomain.com/support';
  }

  ionViewDidLoad() {
    this.platform.ready().then(() => {
      this.browser = new InAppBrowser(this.url, '_blank', 'location=no,zoom=no,hidden=no');
      this.urlHistory.push(this.url);
      this.addEventsToBlankBrowser();
    });
  }

  addEventsToBlankBrowser() {
      this.browser.on('loadstart').subscribe(
        event => {
          if (event.url.indexOf('www.yourdomain.com') === -1) {
            let previousUrl = this.urlHistory.pop();
            this.browser.executeScript({ code: 'window.location.href = "' + previousUrl + '";' });
            this.sysBrowser = new InAppBrowser(event.url, '_system');
            this.url = previousUrl;
            this.urlHistory.push(previousUrl);
            this.browser = new InAppBrowser(previousUrl, '_blank', 'location=yes,zoom=no,hidden=no');
            this.browser.show();
            this.addEventsToBlankBrowser();
          } else {
            this.url = event.url;
            this.urlHistory.push(event.url);
          }
        }
      );
  }
}

Answer 1

当然，只需听取request的成功事件。在升级功能完成之前，不会引发成功事件。

var request = indexedDB.open(...);
request.onupgradeneeded = function() {
  // create indices and whatever
  store.createIndex(...);
};

request.onsuccess = function() {
  console.log('this shows up after the upgrade completes');
};

检查indexeddb createIndex的成功

1 个答案: