* Demo for exception hooks in sysutils

demo/errorhandler/errordemo.lpi

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+<?xml version="1.0" encoding="UTF-8"?>
+<CONFIG>
+  <ProjectOptions>
+    <Version Value="12"/>
+    <General>
+      <Flags>
+        <MainUnitHasCreateFormStatements Value="False"/>
+        <MainUnitHasTitleStatement Value="False"/>
+        <MainUnitHasScaledStatement Value="False"/>
+        <Runnable Value="False"/>
+      </Flags>
+      <SessionStorage Value="InProjectDir"/>
+      <Title Value="errordemo"/>
+      <UseAppBundle Value="False"/>
+      <ResourceType Value="res"/>
+    </General>
+    <CustomData Count="4">
+      <Item0 Name="MaintainHTML" Value="1"/>
+      <Item1 Name="PasJSHTMLFile" Value="project1.html"/>
+      <Item2 Name="PasJSPort" Value="0"/>
+      <Item3 Name="PasJSWebBrowserProject" Value="1"/>
+    </CustomData>
+    <BuildModes>
+      <Item Name="Default" Default="True"/>
+    </BuildModes>
+    <PublishOptions>
+      <Version Value="2"/>
+      <UseFileFilters Value="True"/>
+    </PublishOptions>
+    <RunParams>
+      <FormatVersion Value="2"/>
+    </RunParams>
+    <Units>
+      <Unit>
+        <Filename Value="errordemo.lpr"/>
+        <IsPartOfProject Value="True"/>
+      </Unit>
+      <Unit>
+        <Filename Value="index.html"/>
+        <IsPartOfProject Value="True"/>
+        <CustomData Count="1">
+          <Item0 Name="PasJSIsProjectHTMLFile" Value="1"/>
+        </CustomData>
+      </Unit>
+    </Units>
+  </ProjectOptions>
+  <CompilerOptions>
+    <Version Value="11"/>
+    <Target FileExt=".js">
+      <Filename Value="errordemo"/>
+    </Target>
+    <SearchPaths>
+      <IncludeFiles Value="$(ProjOutDir)"/>
+      <UnitOutputDirectory Value="js"/>
+    </SearchPaths>
+    <Parsing>
+      <SyntaxOptions>
+        <AllowLabel Value="False"/>
+        <CPPInline Value="False"/>
+        <UseAnsiStrings Value="False"/>
+      </SyntaxOptions>
+    </Parsing>
+    <CodeGeneration>
+      <TargetOS Value="browser"/>
+    </CodeGeneration>
+    <Linking>
+      <Debugging>
+        <GenerateDebugInfo Value="False"/>
+        <UseLineInfoUnit Value="False"/>
+      </Debugging>
+    </Linking>
+    <Other>
+      <CustomOptions Value="-Jeutf-8 -Jirtl.js -Jc -Jminclude"/>
+      <CompilerPath Value="$(pas2js)"/>
+    </Other>
+  </CompilerOptions>
+  <Debugging>
+    <Exceptions>
+      <Item>
+        <Name Value="EAbort"/>
+      </Item>
+      <Item>
+        <Name Value="ECodetoolError"/>
+      </Item>
+      <Item>
+        <Name Value="EFOpenError"/>
+      </Item>
+    </Exceptions>
+  </Debugging>
+</CONFIG>

demo/errorhandler/errordemo.lpr

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+program errordemo;
+
+{$mode objfpc}
+
+uses
+  BrowserConsole, JS, Classes, SysUtils, Web;
+
+function DoRaise(aEvent : TJSMouseEvent) : boolean;
+
+begin
+  Result:=False;
+  raise exception.Create('A exception');
+end;
+
+function DoHook(aEvent : TJSMouseEvent) : boolean;
+
+begin
+  Result:=False;
+  HookUncaughtExceptions;
+end;
+
+Procedure DoPascalException(O : TObject);
+
+begin
+  Writeln('O :',O.ClassName);
+  if O is Exception then
+    Writeln('Exception class message : ',Exception(O).Message);
+end;
+
+Procedure DoJSException(O : TJSObject);
+begin
+  writeln('Javascript exception: ',O.toString);
+  if O is TJSError then
+    Writeln('Error message : ',TJSError(O).Message);
+end;
+
+Procedure DoRaiseJS; assembler;
+asm
+  throw new Object();
+end;
+
+Procedure DoRaiseJSError; assembler;
+asm
+  var e = new Error();
+  e.message="My error message";
+  throw e;
+end;
+
+begin
+  // This will only work for the main program if you have set showUncaughtExceptions before rtl.run();
+  TJSHtmlButtonElement(Document.getElementById('btnhook')).OnClick:=@DoHook;
+  // These will not be caught (yet)
+  TJSHtmlButtonElement(Document.getElementById('btn')).OnClick:=@DoRaise;
+  // Uncomment this to set default exception handlers
+  // HookUncaughtExceptions;
+
+  //  Uncomment these to set special exception handlers
+  //  SetOnUnCaughtExceptionHandler(@DoPascalException);
+  //  SetOnUnCaughtExceptionHandler(@DoJSException);
+
+  // Various ways to raise an exception.
+  // DoRaiseJS;
+  // DoRaiseJSError;
+
+  DoRaise(Nil);
+end.

demo/errorhandler/index.html

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+<!doctype html>
+<html lang="en">
+<head>
+  <meta http-equiv="Content-type" content="text/html; charset=utf-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1">
+  <title>TestException</title>
+  <script src="errordemo.js"></script>
+</head>
+<body>
+  <button id="btn">Throw exception</button>
+  <button id="btnhook">Hook events</button>
+  <script>
+    // Uncomment to test setting hook.
+    // rtl.showUncaughtExceptions=true;
+    rtl.run();
+
+  </script>
+  
+</body>
+</html>