Form loading forever on tasklist due to undefined variable

Camunda 7 Topics Discussion & Questions
1

Hello,

I face an issue on Tasklist with embeeded forms, once a variable is not defined and the cam-file-download directive is used.

For example, I have the following:

If the variable “document” is not defined prior to the task creation, then I face the following error:

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image700×329 19.4 KB

How can I check inside my form if the variable “document” is already defined for the specific process instance? If so, then I want to show the download link, otherwise a message that “no document” is attached, it will be shown.

Thank you.

1 Like
2

@camunda
can you help me on that?

3

@NIKOLAOS_NOUSIAS,

You can issue a rest call to check whether form variable is defined for a particular process instance.

GET /process-definition/anId/form-variables

Camunda provides REST API to check each and every variable. Please take a look at Camunda documentation.

Then you can take necessary action. Hope this helps.

4

@cpbpm thanks for your reply and your kindness to share your ideas with me.

I would like to know how could I make the REST API call from the form. Should I use just plain JavaScript or do I need to consider other parameters (like angular directives) in order to make the REST API call?

An example or a similar thread would be really useful for me in order to understand the funcionality.

Thank you in advance.

5

Are you using custom forms, if yes, you can use either java script can be used to invoke REST API to know whether variable exists for a particular process instance. From Google, check how to invoke Rest API using java script.