So without further ado, I’m going to demonstrate one way to take data round-trip from a web page through MATLAB (all running in the same MATLAB session). The main piece of this method is that I am going to have a start function which dynamically creates a web page which loads the desired workspace data. This dynamic page then loads a static page, which is the GUI the user interacts with. This page calls a callback function which evaluates the data from the page and starts the cycle over again. Here is the data flow.
The main function
The purpose of the main function is to be the entry point to the web GUI. It takes data passed in and puts it into a dynamically created web page, that loads our static page. This process could be simplified by creating the whole html part dynamically, but that looses the benefit of using a better html-editing tool to create a nice looking web page (this is not an example of that).
The GUI page
When loaded in the web browser, this page sets the meta content and loads the matlabfromjs4.html into the browser. This page onload queries the value of that tag and writes it into a special div. This page also has a form element that when a value is typed in the box, it will ask MATLAB to do a computation based on that value (in this case magic) and what will refresh the page.
The helper function calculates the output of the magic function and formats the output is a displayable in html string, and calls our main function again with the string, regenerating the frame page, starting the whole process over.
function js4helper(value) %js4helper takes the value from the webpage, find the answer and formats it if ~exist('value','var') %need to check that no valid input was given in case input box was blank. magicVal = ''; else val = magic(value); [r,c] = size(val); format = [repmat('%i ',1,r) '<br>']; magicVal = sprintf(format, val); end matlabfromjs4(magicVal);
That’s the basics of creating dynamic html GUIs in MATLAB. For extra credit I’m leaving you with two assignments:
1. Use base64 encoding to add an image to the web page without having to create an image file.
2. Use ActiveX on Windows to hook a web page running in IE up to a MATLAB session.
UPDATE: (6/23/09) Download the files here: matlabfromjs4.zip
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