add cookie in pdf file

app/pub/scripts/anviewer.js

@@ -1,10 +1,14 @@
 var pdfjsLib = window['pdfjs-dist/build/pdf'];
+var pdfcanvas = "the-canvas";
+var cnt = 100;
+
+
 
 
 function renderPage() {
 
     var el_title = document.getElementById('pdfprogress');
-
+  
 
     el_title.innerHTML = 'Идет подготовка страницы ...';
 
@@ -12,7 +16,7 @@ function renderPage() {
     // Using promise to fetch the page
     pdfDoc.getPage(pageNum).then(function(page) {
 
-    var canvas = document.getElementById('the-canvas');  
+    var canvas = document.getElementById(pdfcanvas);  
     var context = canvas.getContext('2d');
     //var viewport = page.getViewport({scale: scale});
     var viewport = page.getViewport({scale: 1.5});
@@ -38,8 +42,7 @@ function renderPage() {
           pageNumPending = null;
          
         }
-      //  document.getElementById('zoompdf').innerHTML = scale + 'x';
-        el_title.innerHTML = 'Приятного чтения ↓';
+          el_title.innerHTML = 'Приятного чтения ↓';
       });
     });
     
@@ -79,25 +82,33 @@ function pdfzoomout(){
 }
 
 
-var cnt = 100;
 function resize_plus(){
-    var div = document.getElementById("the-canvas");
-    cnt += 4;
-    div.style.width = cnt+"%";
-    setzoom(cnt);
+  cnt += 4;
+  newpdfzoom(cnt);
 }
-function resize_minus(){
-  var div = document.getElementById("the-canvas");
+
+
+function resize_minus(){  
   cnt -= 4;
-  div.style.width = cnt+"%";
-  setzoom(cnt);
+  newpdfzoom(cnt);
 }
 
+function newpdfzoom(czoom){
+  
+  var status = czoom+"%";
+  
+  document.getElementById(pdfcanvas).style.width = status;
+  document.getElementById('zoomstatus').innerHTML = status;
 
-function getzoom(){
+  setzoom('pdfscale', czoom);
 
-  var name = 'pdfscale';
-    
+}  
+
+
+
+function getzoom( name ){
+
+  
   var results = document.cookie.match ( '(^|;) ?' + name + '=([^;]*)(;|$)' );
  
   if ( results ){
@@ -109,9 +120,7 @@ function getzoom(){
 
 }
 
-function setzoom( cvalue, exdays = 30 ) {
-
-    var cname = 'pdfscale';
+function setzoom( cname, cvalue, exdays = 30 ) {
     
     var d = new Date();
     d.setTime(d.getTime() + (exdays*24*60*60*1000));
@@ -123,16 +132,28 @@ function setzoom( cvalue, exdays = 30 ) {
   }
 
 
-function startpdfviewer(){
 
-  var div = document.getElementById("the-canvas");
 
-    czoom = getzoom();
 
-   if (czoom != null & czoom > 10) {
-      div.style.width = czoom+"%" 
+function startpdfviewer(newpdf){
 
-   }  
+  var div = document.getElementById(pdfcanvas);
+   
+
+  currpdf =  getzoom('currpdf');
+  
+  if (currpdf !== null & currpdf !== newpdf){
+    
+    czoom = getzoom('pdfscale');
+    
+    if (czoom != null & czoom > 10) {
+        newpdfzoom(czoom);
+    }  
+
+  }
+  else {
+     setzoom('currpdf', newpdf);
+  }
       
     
     pdfjsLib.getDocument(url).promise.then(function(pdfDoc_) {