Request QR Code and show the image using Angular JS

问题

My plan is to create a QR code by using an API (such as Google Charts API) and then show the generated QR code on my website. I created a function that requests a QR Code image from Google Chart API:

.controller('DealCtrl', function($scope, $http) {
  $http.get("https://chart.googleapis.com/chart?cht=qr&chs=300x300&chl=160%20FSU728F29G&coe=UTF-8")
      .success(function(data, status, headers, config) {
        $scope.qrcode = data;
      }).error(function(data, status, headers, config) {
        $scope.qrcode = status;
  });
})

When I try to bind the response as HTML, I get this:

<div ng-bind-html="qrcode"></div>

The response seems to be an image (PNG). How can I show this on my website?

回答1:

If you don't want to use the image url as is for some reason and you want to create the image from the contents you can use this:

$http.get(
    "https://chart.googleapis.com/chart?cht=qr&chs=300x300&chl=160%20FSU728F29G&coe=UTF-8",
    {responseType: 'blob'})
.then(function(response) {

    var urlCreator = window.URL || window.webkitURL;
    var imageUrl = urlCreator.createObjectURL( response.data );
    $scope.qrcode = '<img src="'+imageUrl+'"/>';

});

demonstrating jsbin

Credit goes to @jan-miksovsky

回答2:

The returned data seems to be HTML. So you need to inject the Google HTML into your page, using ng-bind-htmldirective :

<div ng-bind-html="qrcode"></div>

回答3:

Here is an example of using ng-bind-html http://jsbin.com/lifuparija/edit?html,js,output

But without a more in depth example of what you are trying to accomplish, I feel like this is just a shot in the dark.

回答4:

You can use this directive and then use it in your html code.

create directive:

 angular.module('av.qr', [])
.directive('avQr', function() {
    return {
             restrict: 'E',
             template: '',
             scope: {
                      image: '='
           },
           link: function(scope, elem, attr) {
                 var qrImage = angular.element(scope.image);
                 elem.append(qrImage);
           }
      }
 })

then in your module inject this directive with module name like below:

angular.module('my.module', ['av.qr'])

In your controller append QR image to $scope as you did:

.controller('DealCtrl', function($scope, $http) {
   $http.get("https://chart.googleapis.com/chart?                      cht=qr&chs=300x300&chl=160%20FSU728F29G&coe=UTF-8")
        .success(function(data, status, headers, config) {
             $scope.qrcode = data;
         }).error(function(data, status, headers, config) {
             $scope.qrcode = status;
        });
 })

In your HTML code use your directive like this:
```
    <av-qr image="qrcode"></av-qr>
```

** You pass your qrcode image to your directive.

来源：https://stackoverflow.com/questions/34400499/request-qr-code-and-show-the-image-using-angular-js

标签

javascript

angularjs

ajax

google-api

qr-code