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#1 Posted : Tuesday, March 6, 2018 12:06:58 PM(UTC)


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An updated tutorial for setting a JavaScript license can be found here: https://www.leadtools.co...s-and-set-a-license.html

LEADTOOLS v19 and Earlier
The LEADTOOLS HTML5/JS files use a license file like the other binaries we provide in order to unlock LEADTOOLS features. With LEADTOOLS 18 and LEADTOOLS 19, the Leadtools.js by default would look for the LeadtoolsLicense.txt file in a LEADTOOLS directory from the root of the application folder. The directory location could be changed by setting lt.LTHelper.licenseDirectory, but the name of the file still has to be LeadtoolsLicense.txt. There also isn't any way to reference the text file from another machine. It has to reside in a directory accessible by the web server hosting the application.

With LEADTOOLS 20 and beyond, the license can now be set using RasterSupport.setLicenseUri(). This method will allow developers to not only set a license file from a common location (as might be needed with cloud applications), but it also will let developers specify the name of the file since the file will be downloaded by the browser. This method also includes a callback so if you wanted to run additional code after the license check has occurred you can do so.

Here is some sample code illustrating setLicenseUri:

if (lt.RasterSupport.kernelExpired) {
   lt.RasterSupport.setLicenseUri("http://localhost/SetLicenseTest/data/myLic.txt", function() {  
      if (!lt.RasterSupport.kernelExpired) 
         lt.LTHelper.log("LEADTOOLS client license set successfully"); 
         lt.LTHelper.log("LEADTOOLS client license not set"); 

Note that the web server where the license file is hosted must support the MIME type being requested.

To set the license directly, use lt.RasterSupport.setLicenseText(). The value to pass in for this is the actual contents of the leadtoolslicense.txt file. Note no callback is available when setting the license in this manner.

Edited by moderator Wednesday, December 27, 2023 1:16:18 PM(UTC)  | Reason: Updating layout, adding more information

Walter Bates
Senior Support Engineer
LEAD Technologies, Inc.

Try the latest version of LEADTOOLS for free for 60 days by downloading the evaluation: https://www.leadtools.com/downloads

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