Improve renderDelay option and add to README.

Author: marcbachmann

README.md

@@ -134,6 +134,10 @@ config = {
   "script": '/url',           // Absolute path to a custom phantomjs script, use the file in lib/scripts as example
   "timeout": 30000,           // Timeout that will cancel phantomjs, in milliseconds
 
+  // Time we should wait after window load
+  // accepted values are 'manual', some delay in milliseconds or undefined to wait for a render event
+  "renderDelay": 1000,
+
   // HTTP Headers that are used for requests
   "httpHeaders": {
     // e.g.

lib/scripts/pdf_a4_portrait.js

@@ -53,37 +53,25 @@ setTimeout(function () {
 
 // Completely load page & end process
 // ----------------------------------
-page.onLoadFinished = function (status) {
-  // The paperSize object must be set at once
+if (options.renderDelay === 'manual') page.onCallback = renderNow
+else if (typeof options.renderDelay === 'number') setTimeout(renderNow, options.renderDelay)
+else page.onLoadFinished = renderNow
+
+function renderNow () {
   page.paperSize = definePaperSize(getContent(page), options)
 
-  // Output to parent process
   var fileOptions = {
     type: options.type || 'pdf',
     quality: options.quality || 75
   }
 
   var filename = options.filename || (options.directory || '/tmp') + '/html-pdf-' + system.pid + '.' + fileOptions.type
 
-  takeShot();
-  function takeShot(){
-    var title = page.evaluate(function() {
-      return document.title;
-    });
-
-    if(title.toUpperCase() != "DONE" && options.onTitleDone){
-      window.setTimeout(function () {
-        takeShot();
-      }, 400);
-    } else {
-      page.render(filename, fileOptions)
-      phantom.exit();
-
-      system.stdout.write(JSON.stringify({filename: filename}))
+  page.render(filename, fileOptions)
 
-      exit(null)
-    }
-  }
+  // Output to parent process
+  system.stdout.write(JSON.stringify({filename: filename}))
+  exit(null)
 }
 
 // Returns a hash of HTML content