laravel 从 arraybuffer 显示 pdf

Displaying pdf from arraybuffer

提问by GRESPL Nagpur

I am returning stream data from laravel dompdf from this code

我正在从此代码返回来自 laravel dompdf 的流数据

 $pdf = \App::make('dompdf.wrapper');
 $pdf->loadHTML("<div>This is test</div>");
 return $pdf->stream();

And this is my JS ajax code

这是我的 JS ajax 代码

    $.ajax({
        type:"GET",
        url: "/display",
        responseType: 'arraybuffer'
    }).done(function( response ) {
        var blob = new Blob([response.data], {type: 'application/pdf'});
        var pdfurl = window.URL.createObjectURL(blob)+"#view=FitW";
        $("#pdfviewer").attr("data",pdfurl);
    });

Here is HTML to display pdf after ajax

这是在 ajax 后显示 pdf 的 HTML

<object id="pdfviewer" data="/files/sample.pdf" type="application/pdf" style="width:100%;height:500px;"></object>

I am getting below error

我得到以下错误

Failed to load PDF document

无法加载 PDF 文档

Please help to fix this. How to display pdf file.

请帮助解决这个问题。如何显示pdf文件。

采纳答案by guest271314

jQuery.ajax()does not have a responseTypesetting by default. You can use a polyfill, for example jquery-ajax-blob-arraybuffer.jswhich implements binary data transport, or utilize fetch().

jQuery.ajax()responseType默认情况下没有设置。您可以使用polyfill，例如实现二进制数据传输的jquery-ajax-blob-arraybuffer.js，或利用fetch().

Note also, chrome, chromium have issues displaying .pdfat either <object>and <embed>elements, see Displaying PDF using object embed tag with blob URL, Embed a Blob using PDFObject. Substitute using <iframe>element for <object>element.

还要注意，铬，铬有显示问题.pdf在任<object>和<embed>元素，请参阅使用对象嵌入标记与斑点URL显示PDF，嵌入使用PDFObject的Blob。用<iframe>元素替换<object>元素。

$(function() {

  var pdfsrc = "/display";

  var jQueryAjaxBlobArrayBuffer = "https://gist.githubusercontent.com/SaneMethod/" 
                         + "7548768/raw/ae22b1fa2e6f56ae6c87ad0d7fbae8fd511e781f/" 
                         + "jquery-ajax-blob-arraybuffer.js";

  var script = $("<script>");

  $.get(jQueryAjaxBlobArrayBuffer)
  .then(function(data) {
    script.text(data).appendTo("body")
  }, function(err) {
    console.log(err);
  })
  .then(function() {
    $.ajax({
      url: pdfsrc,
      dataType: "arraybuffer"
    })
    .then(function(data) {
      // do stuff with `data`
      console.log(data, data instanceof ArrayBuffer);
      $("#pdfviewer").attr("src", URL.createObjectURL(new Blob([data], {
            type: "application/pdf"
          })))
     }, function(err) {
          console.log(err);
     });

  });
});

Using fetch(), .arrayBuffer()

使用fetch(),.arrayBuffer()

  var pdfsrc = "/display";

  fetch(pdfsrc)
  .then(function(response) {
    return response.arrayBuffer()
  })
  .then(function(data) {
    // do stuff with `data`
    console.log(data, data instanceof ArrayBuffer);
    $("#pdfviewer").attr("src", URL.createObjectURL(new Blob([data], {
        type: "application/pdf"
    })))
  }, function(err) {
      console.log(err);
  });

plnkr http://plnkr.co/edit/9R5WcsMSWQaTbgNdY3RJ?p=preview

plnkr http://plnkr.co/edit/9R5WcsMSWQaTbgNdY3RJ?p=preview

version 1 jquery-ajax-blob-arraybuffer.js, jQuery.ajax(); version 2 fetch(), .arrayBuffer()

版本 1 jquery-ajax-blob-arraybuffer.js, jQuery.ajax(); 版本 2 fetch(),.arrayBuffer()

回答by jobB

I like guest271314answer a lot, especially the second version using fetch, but I wanted to add a solution that does not use a polyfill or an experimental technology like fetch.

我很喜欢guest271314的答案，尤其是使用fetch的第二个版本，但我想添加一个不使用polyfill或实验技术的解决方案，如fetch.

This solution uses the native XMLHttpRequest APIto create the request. This allows us to change the responseTypeto arrayBuffer.

此解决方案使用本机XMLHttpRequest API来创建请求。这允许我们将 更改responseType为arrayBuffer。

  var xhr = new XMLHttpRequest();
  var pdfsrc = "https://upload.wikimedia.org/wikipedia/en/6/62/Definition_of_management.pdf";
  xhr.open('GET', pdfsrc, true);
  xhr.responseType = "arraybuffer";

  xhr.addEventListener("load", function (evt) {
    var data = evt.target.response;
    if (this.status === 200) {
      $("#pdfviewer").attr("src", URL.createObjectURL(new Blob([data], {
        type: "application/pdf"
      })));
    }
  }, false);

  xhr.send();

I forked guest271314s plnkr to show this method in action: http://plnkr.co/edit/7tfBYQQdnih9cW98HSXX?p=preview

我分叉了guest271314s plnkr来展示这个方法：http://plnkr.co/edit/7tfBYQQdnih9cW98HSXX?p=preview

回答by Andrew Monks

From my tests the responce is in response not response.data, so the following should work:

从我的测试中，响应是响应而不是 response.data，所以以下应该有效：

  $.ajax({
        type:"GET",
        url: "/display",
        responseType: 'arraybuffer'
    }).done(function( response ) {
        var blob = new Blob([response], {type: 'application/pdf'});
        var pdfurl = window.URL.createObjectURL(blob)+"#view=FitW";
        $("#pdfviewer").attr("data",pdfurl);
    });

Although it seems JQuery is doing something with the responce causing a blank PDF output... (PDF is blank when downloading using javascript). This will work:

虽然看起来 JQuery 正在对导致空白 PDF 输出的响应做一些事情......（使用 javascript 下载时 PDF 是空白的）。这将起作用：

var xhr = new XMLHttpRequest();
xhr.open('GET', 'test.pdf', true);
xhr.responseType = 'arraybuffer';
xhr.onload = function(e) {
   if (this.status == 200) {
        var blob=new Blob([this.response], {type:"application/pdf"});
        var pdfurl = window.URL.createObjectURL(blob)+"#view=FitW";
        $("#pdfviewer").attr("data",pdfurl);
   }
};
xhr.send();