Get data from server

[022004009]

Hello,

I am a beginner for LabVIEW nxg. I am getting data from the server, and pass my server URL to HTML get and want to plot the body into a graph. Moreover, data from the server are in array string so I converted into an array and try to plot it but still not working. So I already did the same application with LabVIEW but the same logic not working in LabVIEW nxg web app. Could you help me, how to do this or do you have any example which helps me to solve this prob ?.

[wiebe@CARYA]

Post what you have...

[022004009]

thanks for replying. You can see in the figure, this complete code runs on LabVIEW. But in LabVIEW nxg web app it showing error when I am trying to plot graph. I am reading data from the server. And trying to plot here. JSON format in the string so I converted into an array. But here it is showing that this string to array function is not available. Even I can not print the body or header of url. 

[wiebe@CARYA]

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@022004009 wrote:

But here it is showing that this string to array function is not available. 

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If that is the problem, convert the string manually. In a while loop, get a number (scan from string) until the output of scan from string is empty.

[022004009]

Thanks but the problem is that output form body and header are empty and showing nothing. So, first if there is anything then I can convert. So do you know is it the right method to get data from the server using HTML function or I am missing any other function to read data from the server ?.  

[wiebe@CARYA]

I'm not that familiar with NXG.

The VI sure looks like it should get HTML from a URL.

I'd check if the VI returns an error. If so, it should be helpful.

[022004009]

this error I am getting

JavaScript message in Main.html at line 0: XMLHttpRequest cannot load http://127.0.0.1:8001/Web_Server/ParametricCurve. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:52131' is therefore not allowed access.

[wiebe@CARYA]

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@022004009 wrote:

this error I am getting

JavaScript message in Main.html at line 0: XMLHttpRequest cannot load http://127.0.0.1:8001/Web_Server/ParametricCurve. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:52131' is therefore not allowed access.

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The reason is explained here:

why-does-my-javascript-code-get-a-no-access-control-allow-origin-header-is-pr 

Next step would be to find a solution... I'm not sure if I can help with that.

[022004009]

Thank a lot. I will try this solution.