User tag - Not supported JavaScript expression

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Question by Alexander R. · Oct 01, 2019 at 07:53 AM · uem RUM

User tag - Not supported JavaScript expression

Hello community.

I can`t add JavaScript variable in user tag rule with message "Not supported JavaScript expression"

Why i can`t use JS variables from local storage?

I have no cookies, CSS selector with username. I have only this JS value. Is there any workaround without JS dtrum sdk with dtrum.identify.... to use this value?

Regards,

Alexander

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Janusz D. · Oct 01, 2019 at 08:22 AM 0

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With google you can easily search for how to list all global JS variables in Chrome console.
eg. you can run

for(var b in window) {

if(window.hasOwnProperty(b)) console.log(b);

}

as page below sugggest
https://stackoverflow.com/questions/2934787/view-list-of-all-javascript-variables-in-google-chrome-console

Then use the value you need in Dynatrace
Please mind only global variables are accessible.

Alexander R. Janusz D. · Oct 01, 2019 at 08:34 AM 0

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Hello Janusz,

My question is not "HOW". My question is "WHY it is not possible to use this value"

I use this:

(function ()

{

var keys=Object.keys( window );

for (var i in keys)

{

if (typeof window[keys[i]] != 'function')

console.log(keys[i], window[keys[i]]);

}

})();

I have see this value and can call from web browser console. After cleanup rules (cut usernames and symbols (.:") i will have correct login.

Regards,

Alexander

Answer 1 · 2019-10-01T12:53:43Z

Best Answer

Answer by Janusz D. · Oct 01, 2019 at 12:53 PM

So explanation.
Variable name contained dash so in Chrome console - format as below

localStorage.__Sxxe-Sxxxxxx-RxxxxxxService_Sxxx_Sxxxxx_RxxxxxxyService

did not work

in Chrome console - format as below

localStorage["__Sxxe-Sxxxxxx-RxxxxxxService_Sxxx_Sxxxxx_RxxxxxxyService"]

returned requested value.

Fortunatelly syntax

localStorage.__Sxxe-Sxxxxxx-RxxxxxxService_Sxxx_Sxxxxx_RxxxxxxyService

worked in Dynatrace despite dashes.

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Alexander R. · Oct 01, 2019 at 12:55 PM 0

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Janusz provided me solution as:

In browser console the call executed with error but in Dynatrace we have successfully defined userlogins.

Big thanks to Janusz.

Regards,

Alexander

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Answer 2 · 2019-10-01T08:31:12Z

Answer by Alexander S. · Oct 01, 2019 at 08:31 AM

Have you tried: localStorage.<variableName>?

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Alexander R. · Oct 01, 2019 at 09:31 AM 0

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Hello Alexander

I can`t call localStorage.<variableName>, but i can cal localStorage["some"] - 2 string on screenshot.

You can see localStorage call in browser console on screenshot below:

Can i use localStorage variable with cleanup rules? Will it works?

Regards,

Alexander

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User tag - Not supported JavaScript expression

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