这里在Visual Studio 2015(更新3)中使用angular 4 Web API。 现在,我想在移动设备中使用条形码搜索项目。如何完成此过程,请注意,这是一个有经验的初学者,所以请为我提供这个解决方案的帮助我,我搜索了很多网站,但我无法理解。任何人都可以帮助我找到解决方案。 (TS文件和HTML文件)
答案 0 :(得分:2)
在TS文件中输入功能
constructor(private zone: NgZone){
window.angularComponentReference = {
zone: this.zone,
componentFn: (searchcontent: any) => this.scannerOutput(searchcontent),
component: this,
};
// And write the function
barcode() {
if (typeof Android !== "undefined" && Android !== null) {
Android.openScanner();
}
else {
alert("sorry no item");
}
}
还有index.html
function scannerOutput(searchcontent) {
window.angularComponentReference.zone.run(() =>
{ window.angularComponentReference.componentFn(searchcontent); });
}
答案 1 :(得分:1)
我不确定是否可以,但是您可以尝试@zxing:
第1步-安装npm软件包:
npm install --save @zxing/library @zxing/ngx-scanner
第2步-添加到您的app.module.ts:
import { ZXingScannerModule } from '@angular/forms';
注意:请记住要在“导入” 部分
中添加此库第3步-实现.component.ts:
import { Component, OnInit, ViewChild } from '@angular/core';
import { ZXingScannerComponent } from '@zxing/ngx-scanner';
import { Result } from '@zxing/library';
@Component({
selector: 'app-root',
templateUrl: './app.component.html',
styleUrls: ['./app.component.css']
})
export class AppComponent implements OnInit {
@ViewChild('scanner')
scanner: ZXingScannerComponent;
hasDevices: boolean;
hasPermission: boolean;
qrResultString: string;
qrResult: Result;
availableDevices: MediaDeviceInfo[];
currentDevice: MediaDeviceInfo;
ngOnInit(): void {
this.scanner.camerasFound.subscribe((devices: MediaDeviceInfo[]) => {
this.hasDevices = true;
this.availableDevices = devices;
});
this.scanner.camerasNotFound.subscribe(() => this.hasDevices = false);
this.scanner.scanComplete.subscribe((result: Result) => this.qrResult = result);
this.scanner.permissionResponse.subscribe((perm: boolean) => this.hasPermission = perm);
}
displayCameras(cameras: MediaDeviceInfo[]) {
this.availableDevices = cameras;
}
handleQrCodeResult(resultString: string) {
this.qrResultString = resultString;
}
onDeviceSelectChange(selectedValue: string) {
this.currentDevice = this.scanner.getDeviceById(selectedValue);
}
}
步骤4-实施.component.html
<div style="width: 50%" class="scanner-shell" [hidden]="!hasDevices">
<header>
<select (change)="onDeviceSelectChange($event.target.value)">
<option value="" [selected]="!currentDevice">No Device Selected</option>
<option *ngFor="let device of availableDevices" [value]="device.deviceId"
[selected]="currentDevice && device.deviceId === currentDevice.deviceId">
{{ device.label }}
</option>
</select>
</header>
<zxing-scanner #scanner start="true" [device]="currentDevice"
(scanSuccess)="handleQrCodeResult($event)"
[formats]="['QR_CODE', 'EAN_13','CODE_128', 'DATA_MATRIX']"></zxing-scanner>
<section class="results" *ngIf="qrResultString">
<small>Result: </small>
<strong>{{ qrResultString }}</strong>
</section>
结果:
因此,一旦您在任何设备上打开此组件,浏览器就会要求您访问设备相机。如果您愿意使用它,则应该能够从下拉菜单中选择摄像头,然后,如果使用它扫描Qr码或条形码,则应该在视图上看到其结果。
注意:您必须允许“系统设置”中的应用程序使用相机。对于Windows 10,您可以在相机隐私设置-> 允许应用访问您的相机
中进行操作