How to see the chart with labview WebService

Hi all

I am looking in the labview 8.6 web services option. I've seen some simple examples that can be found here on the website of the NC. But these examples generally deal with static data. As in the example of the sum, you enter your parameters in the URL, and the result is displayed in your web browser.

What I want to do now is display a chart in my web browser that show a mobile signal. But I'm having a hard time the realization of this. How to make this work? Do I need AJAX, Measurement studio? or is it sufficient to use the labview web service.

Best regards.

ynse,

You are right that web services do not require runtime must be installed on the client. Unlike the remote panels that make the VI on the client, web services nothing do with the client at all. Simply, the web service is running on the server and returns data to the client. The customer can return the data, but he wishes.

Your question about studio of measure and AJAX is really asking questions on the client end. You can certainly use the AJAX controls that are updated with the data they acquire a web service from LV. A graph, however, is extremely difficult because javascript has not yet drawing capabilities.

Web graphics I've seen do one of the following:

-'Draw' the points on graph using HTML elements with javascript. It of complicated, would be difficult to get working on all browsers and would have problems of severe performance with large data sets.

-The web service returns an image of a graph that refreshes the client. It takes more bandwidth than necessary, and the server must be able to take a snapshot of the graph. (LV real-time cannot use this approach.)

-The graph is rendered using a plugin for the browser. There are many technologies that can be used to do this: Java, Flash, Silverlight, etc. The example you mentioned used flex from Adobe which is a valid approach that you should not be quick to dismiss.

Measurement Studio is not my area of expertise, and I don't know what it can provide for the creation of a graph. What it provides probably made use of one of the above methods.

Nathan

Tags: NI Software

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