Detecting scroll event of Iframe called by AJAX reqest

Al3*_*saz 7 html javascript php iframe jquery

i have a link in my main page that uses ajax to retrieve a PDF which is displayed in an Iframe, i am trying to detect scroll event of the PDF document and display a message or do something. i have tried different solutions from other solutions on stackoverflow and google search in general and couldn't find a good solution.

Main.php

 <html>
 <!--ajax request-->
 <script type="text/javascript">
  $(document).on('click','#nextpdf',function(event) {

  event.preventDefault();

  var reg = $(this).attr("href");
  var str = reg.split('?')[1];

  $.ajax({

    type: "GET",
    url: '../functions/pdfreader.php',
    data: 'pdfxs='+str+'',
    cache:false,
      async: false,
     success: function(data) {
   // data is ur summary
  $('.refresh').html(data);
  return false;
        }

   });//end of ajax

      });


</script>
  <?php

     while($obj = $c_content->fetch())
 {
   $title = $obj['lecture_title'];

    echo '<article class="comment2">

    //pdf link
   <div class="comment2-body">
<div class="text" style="color:#999;padding-right:130px;">
  <p><a href="../functions/pdfreader.php?'.$title.'"" 
  style="color:#999" id="nextpdf">'.$title.'</a></p>
   </div>
</div>
 </article>
   ';

    }

    ?>
    </html>
Run Code Online (Sandbox Code Playgroud)

pdfreader.php

//detect iframe pdf scroll
               <script type="text/javascript">
     $("myiframe").load(function () {
     var iframe = $("myiframe").contents();

     $(iframe).scroll(function () { 
      alert('scrolling...');
        });
           });
        </script>

  <?php



         ........
        while($obj = $gettrend->fetch())
    {
       $coursefile = $obj['lecture_content'];
          //this is my iframe
       echo '<div class="mov_pdf_frame"><iframe id="myiframe"
      src="https://localhost/einstower/e-learn/courses/pdf/'.$coursefile.'" 
      id="pdf_content"
     width="700px" height="800px" type="application/pdf">
       </iframe></div>';
             }
                 ?>
Run Code Online (Sandbox Code Playgroud)

The major problem here is that nothing happens when i scroll the pdf document, how can i detect scrolling?

i found this fiddle that works but i cant view the javascript solution. http://fiddle.jshell.net/czw8pbvj/1/

plo*_*uzz 1

因为这个问题是很久以前问的,所以我想我需要帮助一下我以前的经验。

答案是:你不能

为什么?因为 PDF 是由外部应用程序呈现的,例如 adobe pdf reader、foxit 或其他。并且您不能在它们上附加事件。

如果您使用的是 adobe reader,您唯一能做的就是转到页面、更改缩放等。完整示例您可以在此处阅读: https ://www.adobe.com/content/dam/acom/en/devnet/acrobat/pdfs /pdf_open_parameters.pdf#page=8(请参阅。我直接将您带到第 8 页,而不是第一页)。

但是,嘿...如果我们的客户使用其他应用程序怎么办?我们会更加困惑


做到这一点的方法就是构建您自己的 pdf 查看器。

我们可以使用js库,例如: http://www.bestjquery.com/2012/09/best-jquery-pdf-viewer-plugin-examples/

但在这里我只会向您展示如何使用由 mozilla 创建的pdf.js。

main.php

<style>
.preview{
    display:none;
    width: 400px;
    height: 400px;
    border: 1px solid black;
}

</style>
<a href="pdfreader.php?pdfxs=test.pdf" style="color:#999;" id="nextpdf">file/test.pdf</a><br>
<a href="pdfreader.php?pdfxs=test1.pdf" style="color:#999;" id="nextpdf">file/test1.pdf</a><br>
<div class="preview">
    <iframe id="myiframe" frameborder="0" width="400px" height="400px" >not support iframe</iframe>
</div>

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script type="text/javascript">
$(function(){
    $(document).on('click', '#nextpdf', function(e){
        e.preventDefault();
        $('#myiframe').attr('src', $(this).attr('href'));
        $('.preview').show();
    });

    //handle iframe on scroll
    $('#myiframe').on('load', function () {
        $(this).contents().scroll(function () { 
            console.log('scrolled');
        }).click(function(){
            console.log('clicked');
        });
    });

});


</script>
Run Code Online (Sandbox Code Playgroud)

pdfreader.php

<?php 
$path = 'file/';
$pdf = isset($_GET['pdfxs']) ? $path . $_GET['pdfxs'] : '';
if(!file_exists($pdf) ||  !mime_content_type($pdf) =='application/pdf') die('file not found');
?>
<div id="pdf-container">
    <div id="pdf-box"></div>
</div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="//mozilla.github.io/pdf.js/build/pdf.js"></script>

<script>
$(function(){

    //original script : https://gist.github.com/fcingolani/3300351
    function renderPDF(url, canvasContainer, options) {
        var options = options || { scale: 1 };

        function renderPage(page) {
            var viewport = page.getViewport(options.scale);
            var canvas = $(document.createElement('canvas'));
            var renderContext = {
              canvasContext: canvas[0].getContext('2d'),
              viewport: viewport
            };
            canvas.attr('width', viewport.width).attr('height', viewport.height);

            canvasContainer.append(canvas);
            page.render(renderContext);
        }

        function renderPages(pdfDoc) {
            for(var num = 1; num <= pdfDoc.numPages; num++)
                pdfDoc.getPage(num).then(renderPage);
        }
        PDFJS.disableWorker = true;
        PDFJS.getDocument(url).then(renderPages);
    }

    renderPDF('<?=$pdf;?>', $('#pdf-box'));
});
</script>
Run Code Online (Sandbox Code Playgroud)

注意:我将pdf放在文件夹中file/

main.php会注意到您可以将事件滚动(也可以单击)附加到 pdf 中。因为我们的 pdf 现在不是由外部应用程序渲染的。

最后一部分是,如果你pdfreader.php仔细阅读,你会发现你不再需要 iframe 了。你只需要 div,然后你就可以完全处理你想要的 pdf 的所有事件:如滚动、单击、更改页面、缩放等。为什么?因为你的 pdf 现在被重新渲染为画布(pdf.js 将你的 pdf 渲染为 HTML5 画布)。查看pdf.js 的完整示例