add cookie

app/pub/scripts/anviewer.js

@@ -3,6 +3,7 @@ var pdfjsLib = window['pdfjs-dist/build/pdf'];
 
 function renderPage() {
 
+
     document.getElementById('pdfprogress').innerHTML = 'Идет подготовка страницы ...';
 
     pageRendering = true;
@@ -35,30 +36,71 @@ function renderPage() {
     
     document.getElementById('zoompdf').innerHTML = scale + 'x';
     document.getElementById('pdfprogress').innerHTML = 'Приятного чтения ↓';
-
-    if (typeof prevlink !== 'undefined') 
-        document.getElementById('prevbutton').href = prevlink + '/'+ scale;
-    
-    if (typeof nextlink !== 'undefined')    
-        document.getElementById('nextbutton').href = nextlink + '/'+ scale;
+   
 }  
 
 
+function prevclick(){
+    prevurl = prevlink + '/'+ scale;
+    location.href = prevurl;
+    return;
+}
+
+function nextclick(){
+    nexturl = nextlink + '/'+ scale;
+    location.href = nexturl;
+    return;
+}
+
+
 function pdfzoomin(){
 
     scale += 0.25;
+    setzoom(scale);
     renderPage();
 
+
 }
 
 function pdfzoomout(){
 
     scale -= 0.25;
+    setzoom(scale);
     renderPage();
 
 }
 
+
+function getzoom(){
+
+  var cname = 'pdfscale';
+    
+  var results = document.cookie.match ( '(^|;) ?' + cname + '=([^;]*)(;|$)' );
+ 
+  if ( results )
+    return ( unescape ( results[2] ) );
+  else
+    return null;
+
+}
+
+function setzoom( cvalue, exdays = 30 ) {
+
+    var d = new Date();
+    d.setTime(d.getTime() + (exdays*24*60*60*1000));
+    
+    var cname = 'pdfscale';
+    document.cookie = cname + "=" + cvalue + "; expires=" + expires + "; path=/";
+    
+}
+
+
 function startpdfviewer(){
+
+    czoom = getzoom();
+
+    if (czoom !== null  ||  isNaN(czoom))
+        scale = czoom;
     
     pdfjsLib.getDocument(url).promise.then(function(pdfDoc_) {
         pdfDoc = pdfDoc_;