LTHelper Object

Summary

Represents a helper class used by the various LEADTOOLS components to detect the current browser and operating system.

Syntax

JavaScript Syntax
function lt.LTHelper
TypeScript Syntax
class lt.LTHelper()

Remarks

LTHelper is used by the various LEADTOOLS components to detect the current browser and operating system. The capabilities and support of the various combinations are used to optimize the operation of the component.

This class is initialized automatically when the application starts. You can use the values of the properties in your own operations. However, do not change them.

Example

This example will show the various LTHelper's properties for the current browser.

Copy and paste this example into your favorite text editor and save it into a folder on your disk with any name such as Default.htm. Inside that folder, create a directory with the name "Scripts". Copy the required .js files in the example from "LEADTOOLS Installation Folder\Bin\JS" to "Scripts". Finally, open the HTML file in any browser that supports HTML 5.

JavaScript Example
<!DOCTYPE html> 
<html> 
<head> 
   <title>Leadtools Examples</title> 
   <meta http-equiv="X-UA-Compatible" content="IE=9" /> 
   <meta http-equiv="content-type" content="text/html; charset=utf-8" /> 
   <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=0, minimum-scale=1.0, maximum-scale=1.0" /> 
   <meta name="apple-mobile-web-app-capable" content="yes" /> 
   <meta name="apple-mobile-web-app-status-bar-style" content="black-translucent" /> 
   <script type="text/javascript" src="Scripts/Leadtools.js"></script> 
   <script type="text/javascript"> 
      (function () { 
         DefaultPage = function DefaultPage() { 
         } 
 
         DefaultPage.prototype = { 
 
            run: function SiteLibrary_DefaultPage$run() { 
               this.RunExample(); 
            }, 
 
            dispose: function SiteLibrary_DefaultPage$dispose() { 
            }, 
 
            RunExample: function() { 
               var exampleButton = document.getElementById("LTHelperExampleButton"); 
               exampleButton.addEventListener("click", function() { 
                  var text = ""; 
 
                  // Show the Operating System 
                  switch (lt.LTHelper.OS) { 
                     case lt.LTOS.windows: 
                        text += "OS: Windows"; 
                        break; 
                     case lt.LTOS.mac: 
                        text += "OS: Mac"; 
                        break; 
                    case lt.LTOS.iOS: 
                        text += "OS: iOS"; 
                        break; 
                    case lt.LTOS.android: 
                        text += "OS: Android"; 
                        break; 
                    case lt.LTOS.linux: 
                        text += "OS: Linux"; 
                        break; 
                    case lt.LTOS.blackberry: 
                        text += "OS: Blackberry"; 
                        break; 
                    case lt.LTOS.windows7: 
                        text += "OS: Windows7"; 
                        break; 
                    case lt.LTOS.windows8: 
                        text += "OS: Windows8"; 
                        break; 
                    case lt.LTOS.unknown: 
                    default: 
                        text += "OS: Unknown"; 
                        break; 
                  } 
                  text += "\r\n"; 
 
                  // Show the Device 
                  switch (lt.LTHelper.device) { 
                     case lt.LTDevice.desktop: 
                        text += "Device: Desktop"; 
                        break; 
                     case lt.LTDevice.mobile: 
                        text += "Device: Mobile"; 
                        break; 
                     case lt.LTDevice.tablet: 
                        text += "Device: Tablet"; 
                        break; 
                     case lt.LTDevice.unknown: 
                     default: 
                        text += "Device: Unknown"; 
                        break; 
                  } 
                  text += "\r\n"; 
 
                  // Show the Browser 
                  switch (lt.LTHelper.browser) { 
                     case lt.LTBrowser.internetExplorer: 
                        text += "Browser: InternetExplorer"; 
                        break; 
                     case lt.LTBrowser.firefox: 
                        text += "Browser: Firefox"; 
                        break; 
                     case lt.LTBrowser.chrome: 
                        text += "Browser: Chrome"; 
                        break; 
                     case lt.LTBrowser.safari: 
                        text += "Browser: Safari"; 
                        break; 
                     case lt.LTBrowser.opera: 
                        text += "Browser: Opera"; 
                        break; 
                     case lt.LTBrowser.android: 
                        text += "Browser: Android"; 
                        break; 
                     case lt.LTBrowser.unknown: 
                     default: 
                        text += "Browser: Unknown"; 
                        break; 
                  } 
                  text += "\r\n"; 
 
                  // Show version and vendor 
                  text += "Version: " + lt.LTHelper.version + "\r\n"; 
                  text += "Vendor: " + lt.LTHelper.vendor + "\r\n"; 
 
                  // Show the capabilities 
                  text += "SupportsHTMLPointerEvents: " + lt.LTHelper.supportsHTMLPointerEvents + "\r\n"; 
                  text += "SupportsCSSTransitions: " + lt.LTHelper.supportsCSSTransitions + "\r\n"; 
                  text += "SupportsFileReader: " + lt.LTHelper.supportsFileReader + "\r\n"; 
                  text += "SupportsCanvas: " + lt.LTHelper.supportsCanvas + "\r\n"; 
                  text += "SupportsTypedArray: " + lt.LTHelper.supportsTypedArray + "\r\n"; 
                  text += "SupportsTouch: " + lt.LTHelper.supportsTouch + "\r\n"; 
                  text += "SupportsMultiTouch: " + lt.LTHelper.supportsMultiTouch + "\r\n"; 
                  text += "SupportsWebGL: " + lt.LTHelper.supportsWebGL + "\r\n"; 
                  text += "SupportsTransform: " + lt.LTHelper.supportsTransform + "\r\n"; 
                  text += "SupportsAnimationFrame: " + lt.LTHelper.supportsAnimationFrame + "\r\n"; 
 
                  // output the result into the text area 
                  var outputTextArea = document.getElementsByName("outputTextArea")[0]; 
                  outputTextArea.value = text; 
                  outputTextArea.scrollTop = outputTextArea.scrollHeight; 
               }, false); 
            }, 
         } 
 
         DefaultPage.registerClass("DefaultPage", null, ss.IDisposable); 
         var page = null; 
         var windowLoad = null; 
         var windowUnload = null; 
         windowLoad = function (e) { 
            window.removeEventListener("load", windowLoad, false); 
            page = new DefaultPage(); 
            page.run(); 
            window.addEventListener("unload", windowUnload, false); 
         }; 
         windowUnload = function (e) { 
            window.removeEventListener("unload", windowUnload, false); 
            page.dispose(); 
         }; 
         window.addEventListener("load", windowLoad, false); 
      })(); 
   </script> 
</head> 
<body> 
   <input type="button" id="LTHelperExampleButton" value="LTHelper Example" /> 
   <div> 
      <textarea name="outputTextArea" cols="80" rows="10"></textarea> 
   </div> 
</body> 
</html>

Requirements

Target Platforms

Help Version 19.0.2017.10.27
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