Question

我正在使用离子框架，我想从厨房中选择一个图像文件，并希望将其转换为PDF并希望将其保存在手机上的文件系统中。是否有任何javascript或cordova插件可用于执行此任务。

我发现jsPDF可用于将图片转换为PDF格式，但它是否真的适用于移动设备？

Answer 1

我希望我不会那么晚！

除了jSPDF之外，还需要以下软件包：

科尔多瓦-插件文件
科尔多瓦-插件文件-opener2

并安装相应的ionic-package：

bower install ngCordova

请注意，如何在文件系统中保存pdf文件有几种可能的解决方案。我必须将pdf文件移动到某个目录才能打开它。不过这个解决方案适用于我到目前为止测试的所有Android手机，你可以创建你喜欢的所有PDF文件。

iOS：您可以修改存储目录，以便它也适用于iOS版本。

的index.html：

<head>
<meta charset="utf-8">
... include jsPDF
<script src="https://cdnjs.cloudflare.com/ajax/libs/jspdf/1.3.2/jspdf.debug.js"></script>

....
some html
....

... include ngCordova
<script src="lib/ngCordova/dist/ng-cordova.js"></script>

.... the core-library
<script src="cordova.js"></script>
....
</head>

View.html：

<ion-view view-title="Dashboard">
  <ion-content class="padding">
    <p on-tap="savePDF()">Create PDF</p>
    <p on-tap="openPDF()">Open PDF</p>
  </ion-content>
</ion-view>

应用-JS：

// to not forget to include ngCordova in order to use $cordovaFile in your controller
angular.module('starter', ['ionic', 'starter.controllers', 'starter.services','ngCordova'])
...
...

控制器-JS：

angular.module('starter.controllers', []).controller('DashCtrl', function($scope,$cordovaFile) {

  $scope.pdfFilename = "test.pdf";

  $scope.makePDF = function(){
    var imgData = "your base64 image-data";

    var doc = new jsPDF();

    doc.setFontSize(40);
    doc.text(35, 25, "Octonyan loves jsPDF");
    doc.addImage(imgData, 'JPEG', 15, 40, 180, 180);
    return doc.output('blob');
  };

  $scope.getDirectoryInfo = function(){
    return {
      storage: cordova.file.externalRootDirectory, // for android, you may have to use another directory
      pdfDir: cordova.file.externalRootDirectory+"pdfs/"
    }
  };

  $scope.savePDF = function(){
    var dirs = $scope.getDirectoryInfo();
    var storageDir = dirs.storage;

    // create directory on the first place if it has not been created so far
    $cordovaFile.createDir(storageDir, "pdfs", false);

    var pdfBlob = $scope.makePDF();
    // create empty pdf-file(in the root-dir)
    $cordovaFile.createFile(storageDir, $scope.pdfFilename, true).then(function(success) {
      // write pdf-file(in the root dir)
      $cordovaFile.writeExistingFile(storageDir, $scope.pdfFilename, pdfBlob, true).then(function (success) {
        var fullTmpPath = storageDir + $scope.pdfFilename;
        window.resolveLocalFileSystemURL(fullTmpPath, function (fileEntry) {
          // get destination-directory to put your pdf into
          window.resolveLocalFileSystemURL(dirs.pdfDir, function (dirEntry) {
            // move written pdf to the destination-directory
            fileEntry.moveTo(dirEntry, $scope.pdfFilename, function (newFileEntry) {
              alert($scope.pdfFilename+' is finish! Now you can open it');
            });
          });
        });
      }, function (error) {
        console.log('there was some error while writting file: ',error);
      });
    });

  };

  $scope.openPDF =function(){
    var dirs = $scope.getDirectoryInfo();
    cordova.plugins.fileOpener2.open(dirs.pdfDir+$scope.pdfFilename,'application/pdf',function(){
      console.log('success');
    });
  };

});

希望这有助于尽管您的问题已经提前了一段时间。

JPG to PDF转换Cordova插件

1 个答案: