server/AyaNova/biz/ReportBiz.cs

@@ -10,6 +10,7 @@ using AyaNova.Models;
 using EnumsNET;
 using PuppeteerSharp;
 using Newtonsoft.Json.Linq;
+using System.Threading;
 
 namespace AyaNova.Biz
 {
@@ -374,6 +375,7 @@ namespace AyaNova.Biz
                 await new BrowserFetcher().DownloadAsync(BrowserFetcher.DefaultRevision);
             }
 
+
             //https://stackoverflow.com/questions/53367966/puppeteer-sharp-still-appear-many-chromium-instance-in-process-task-manager-when
             log.LogDebug($"Launching headless Chrome now:");
             using (var browser = await Puppeteer.LaunchAsync(lo))
@@ -381,6 +383,8 @@ namespace AyaNova.Biz
             {
                 try
                 {
+                  
+
                     log.LogDebug($"Preparing page: adding base reporting scripts to page");
 
                     //Add Handlebars JS for compiling and presenting                    
@@ -470,11 +474,21 @@ namespace AyaNova.Biz
                     //prePareData / preRender
                     var ReportDataObject = $"{{ ayReportData:{ReportData}, ayReportMetaData:{reportMeta}, ayClientMetaData:{clientMeta}, ayServerMetaData:{serverMeta} }}";
                     log.LogDebug($"Calling ayPreRender...");
-                    var PreParedReportDataObject = await page.EvaluateExpressionAsync<dynamic>($"ayPreRender({ReportDataObject});");//note ayPreRender is async but dont' use await to call it as the EvaluateExpressionAsync function knows how to handle that already
+
+                    //PRE-RENDER ORIGINAL WAY
+                  // var PreParedReportDataObject = await page.EvaluateExpressionAsync<dynamic>($"ayPreRender({ReportDataObject});");//note ayPreRender is async but dont' use await to call it as the EvaluateExpressionAsync function knows how to handle that already
+
+                    //PRE_RENDER WITH TIMEOUT
+                    var w = new WaitForFunctionOptions() { Timeout = 10000 };                   
+                    //var test = await page.WaitForExpressionAsync($"aytest()==true", w);
+                    // var PreParedReportDataObject = await page.WaitForExpressionAsync($"ayPreRender({ReportDataObject})!=null", w);
+
+                    //new style, nothing to return, keeps data on page
+                    await page.WaitForExpressionAsync($"ayPreRenderEx({ReportDataObject})", w);
 
                     //compile the template
                     log.LogDebug($"Calling Handlebars.compile...");
-                    var compileScript = $"Handlebars.compile(`{report.Template}`)({PreParedReportDataObject});";
+                    var compileScript = $"Handlebars.compile(`{report.Template}`)(PreParedReportDataObject);";
                     var compiledHTML = await page.EvaluateExpressionAsync<string>(compileScript);
 
                     //render report as HTML   

server/AyaNova/resource/rpt/ay-report.js

@@ -9,6 +9,19 @@ async function ayPreRender(ayAllData) {
   }
 }
 
+let PreParedReportDataObject = null;
+let DataReady=false;
+
+async function ayPreRenderEx(ayAllData) {
+  if (typeof ayPrepareData === "function") {
+    PreParedReportDataObject = await ayPrepareData(ayAllData);
+  } else {
+    PreParedReportDataObject = ayAllData;
+  }
+  DataReady=true;
+  return true;
+}
+
 ///////////////////////////////////////
 // Set our stock handlebars helpers
 //
@@ -38,7 +51,7 @@ function ayRegisterHelpers() {
   });
 
   Handlebars.registerHelper("ayWiki", function (ayValue) {
-    if(ayValue==null){
+    if (ayValue == null) {
       return "";
     }
     return new Handlebars.SafeString(