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I am trying to run graph editor example in mxgraph. But i am unable to run it locally on my system.

It gives the error msg of unable to load the resource. it says that it is blocked by cors.. i have disable XMLHTTP support in the browser but still same error. i am using it for development processes so want to run it locally.

i expected to run the graph editor locally on my machine. but getting error of unable to load the resources. the error msg is as follows:

Access to XMLHttpRequest at 'file:///C:/Users/USER/Desktop/projects%20bpmn/mxgraph-master/javascript/examples/grapheditor/www/resources/grapheditor.txt' from origin 'null' has been blocked by CORS policy: Cross origin requests are only supported for protocol schemes: http, data, chrome, chrome-extension, https.

Prateek naik
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1 Answers1

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If you use Chrome you could disable web security which would allows you to do XHR locally (Check this out).

However... I tried that and it didn't work with grapheditor, I imagine it has to do with the responses you get when reading from the filesystem using file:///, I'm guessing you don't get 200 and other responses). Also disabling Chrome security is, well... insecure; so I wouldn't recommend that as a go to alternative.

From what I've tried you can go with two alternatives:

  • Have your own webserver running somewhere, add grapheditor to some path inside you webserver and access grapheditor that way. There's a disadvantage in running it this way, you don't get all the functionalities because you need some back-end to process stuff and you would have to have one (or create one).
  • (I assume you know your way around in a Command Line and that you have java installed) Use the included Java webserver. To run it, download Ant. Then inside the java dir of mxgraph run ant grapheditor. The java dir is: mxgraph/java , you will find a build.xml file inside.

I am currently doing some experimentation using the second alternative and it's working ok. I would definitely spend some time on option 2 so you can have grapheditor running smoothly.

Hope this helps...

loco.loop
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