Passing Matlab's Variable To JavaScript via COM

Question

Wan Nawi 2011-5-25

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https://ww2.mathworks.cn/matlabcentral/answers/8151-passing-matlab-s-variable-to-javascript-via-com

采纳的回答： Kaustubha Govind

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Hello,

I would like to ask a question (Isn't that obvious?).

I have MATLAB as COM-Client and InternetExplorer as COM-Server.

I want to invoke a JavaScript method using variables from MATLAB. To invoke the method, I use the following command. (h is the handle for COM)

h.Document.parentWindow.execScript('JavaScriptFunction(22,22,22);','JavaScript');

I would like to change the number 22 with MATLAB variables. The problem is, the substitution of the 22 with a variable does not work as the variable is between the apostrophes.

I tried using this way to invoke the method.

h.Document.parentWindow.execScript(['''JavaScriptFuntion(' num2str(variableone) ',' num2str(variabletwo) ',' num2str(variablethree)  ')'',''JavaScript''']);

But no luck. Following error occurs:

    ??? Invoke Error, Dispatch Exception:
    Description: Type mismatch.
    Help File: C:\Windows\System32\mshtml.hlp
    Help Context ID: 0

My idea to solve this problem is to pass the variables to JavaScript and then invoke the method using that variables. But, I don't know how.

Any help?

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Answer 1

Kaustubha Govind 2011-5-25

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It seems like the method execScript requires two arguments, but in your second statement, you are effectively passing in only one string. Also, you are concatenating unnecessary apostrophes. What happens when you try:

h.Document.parentWindow.execScript(['JavaScriptFuntion(' num2str(variableone) ',' num2str(variabletwo) ',' num2str(variablethree)  ')'], 'JavaScript');

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Answer 2

Wan Nawi 2011-5-25

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https://ww2.mathworks.cn/matlabcentral/answers/8151-passing-matlab-s-variable-to-javascript-via-com#answer_11236

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Thanks! Your solution works!

Btw, with the second statement I would like to reproduce the string needed to execute the function:

'JavaScriptFunction(22,22,22);','JavaScript'

But it looks like that the execScript method does not really want the to be executed function stays between apostrophes.

Regarding the other question, is the variable passing between matlab and an HTML document containing JavaScript possible?

Regards, Wan

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Kaustubha Govind 2011-5-26

Yes. In this case, MATLAB is acting like a COM client. The documentation describes handling of COM Data in MATLAB: http://www.mathworks.com/help/techdoc/matlab_external/bq4epvg-1.html

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