如下所示,我使用的是[src]属性.我要做的是预览从设备的相机拍摄的图像.请参阅下面的其他打字稿代码.
<img [src]="lastImage" style="width: 100%" [hidden]="lastImage === null">
<button ion-button icon-left (click)="presentActionSheet()">
<ion-icon name="camera"></ion-icon>Select Image
</button>
这是.ts代码
lastImage: string = null;
public presentActionSheet() {
let actionSheet = this.actionSheetCtrl.create({
title: 'Select Image Source',buttons: [
{
text: 'Load from Library',handler: () => {
this.takePicture(this.camera.PictureSourceType.PHOTOLIBRARY);
}
},{
text: 'Use Camera',handler: () => {
this.takePicture(this.camera.PictureSourceType.CAMERA);
}
},{
text: 'Cancel',role: 'cancel'
}
]
});
actionSheet.present();
}
public takePicture(sourceType) {
// Create options for the Camera Dialog
var options = {
quality: 100,sourceType: sourceType,saveToPhotoAlbum: false,correctOrientation: true
};
// Get the data of an image
this.camera.getPicture(options).then((imagePath) => {
// Special handling for Android library
if (this.platform.is('ios') && sourceType === this.camera.PictureSourceType.PHOTOLIBRARY) {
alert('IF');
this.filePath.resolveNativePath(imagePath).then(filePath => {
let correctPath = filePath.substr(0,filePath.lastIndexOf('/') + 1);
let currentName = imagePath.substring(imagePath.lastIndexOf('/') + 1,imagePath.lastIndexOf('?'));
// alert(correctPath);
alert(correctPath + currentName);
this.lastImage = correctPath + currentName;
// this.copyFileToLocalDir(correctPath,currentName,this.createFileName());
});
} else {
alert('ELSE'); // This part runs
var currentName = imagePath.substr(imagePath.lastIndexOf('/') + 1);
var correctPath = imagePath.substr(0,imagePath.lastIndexOf('/') + 1);
alert(cordova.file.dataDirectory + currentName); // This returns proper image path
this.lastImage = cordova.file.dataDirectory + currentName;
alert(this.lastImage); // this also has the image path.
this.copyFileToLocalDir(correctPath,this.createFileName());
}
},(err) => {
this.presentToast('Error while selecting image.');
});
}
现在,当我选择图像使用相机然后它打开相机,我拍了一张照片.但不知何故,我上面的HTML中没有预览照片,我正在使用[src] =“lastImage”.我的代码有什么问题,它没有显示来自相机的任何图像？
UPDATE
我也使用了normalizeURL,我发现here如下！
import { normalizeURL } from 'ionic-angular';
this.lastImage = normalizeURL(cordova.file.dataDirectory + currentName);
这段代码会发生什么,它用http：// localhost：8080替换file：///部分,而我从摄像机拍摄的照片本地而不是任何服务器,并希望在img标签上显示.
解决方法
他,我建议使用base64将图像设置为img标签,检查下一个代码：
控制器属性
private base64Image: any = false;
在你的控制器构造函数集中：“public domSanitizer：DomSanitizer”作为参数,这允许对角度表示图像是“安全的”.
控制器方法
takePicture() {
const options: CameraOptions = {
quality: 10,destinationType: this.camera.DestinationType.DATA_URL,encodingType: this.camera.EncodingType.JPEG,mediaType: this.camera.MediaType.PICTURE
}
this.camera.getPicture(options).then((imageData) => {
// imageData is either a base64 encoded string or a file URI
// If it's base64:
this.base64Image = 'data:image/jpeg;base64,' + imageData;
},(err) => {
this.message("Error,your camera device not work");
});
}
在您的视图文件中
<img *ngIf="base64Image != 'false'" [src]="domSanitizer.bypassSecurityTrustUrl(base64Image)">
