Stale forms detected & application.createNewFormInstance()

Questions and answers for designing and implementing forms in Servoy

Stale forms detected & application.createNewFormInstance()

Postby gk1441607435 » Mon Feb 17, 2020 2:31 pm

Hi everyone,

We have a form in our API that we use for basic searches over all our solutions. The name of the form is "base_lookup". Now a have a special case and I need a slightly different search algorithm only for that case. Therefore I changed the function code on the form with:

Code: Select all
// Remove changes to avoid stale form
history.removeForm("base_lookup");
solutionModel.removeForm("base_lookup");
solutionModel.revertForm("base_lookup");
forms.base_lookup.controller.recreateUI();


// Remove old function and insert new one (with same name)
lookupForm.removeMethod(myOldFunction);
lookupForm.newMethod(myNewFunction);


// Maybe unnecessary...
forms.base_lookup.controller.recreateUI();


That works fine. I can do my special search.

But when I do a second search with this form, I get an error like this.

Stale form(s) detected, form(s) were altered by the solution model without destroying them first
The form(s) that are stale (can also be a parent form if form inheritance is used) are:
Form name:'base_lookup' with instances: [base_lookup8B9BCCE8-0E21-4768-8D5D-93FA9F3991CE]
at C:\Servoy\Data\omsv_bazu_8\omsv_bazu\bazu_za.js:113


I know this error happens, when already created forms are changed and not recreated properly. So I tried all combinations with history.removeForm(), solutionModel.removeForm(), forms.base_lookup.controller.recreateUI(), ... (It's also the reason why there are two forms.base_lookup.controller.recreateUI() in the code, just to make sure.)


I think the problem happens in a different place. I our API we create the search form like this:

Code: Select all
var luUUID = application.getUUID();
var luFormNamHpt = "base_lookup" + luUUID;

application.createNewFormInstance("base_lookup", luFormNamHpt);


This will create every time a new instance of the form with the name "base_lookup" and a random UUID. Also the error message says there is a instance with the name "base_lookup8B9BCCE8-0E21-4768-8D5D-93FA9F3991CE". Even it's not good that there will be everytime a new instance created when the user does a search, I don't want to change this code, because it works well for a long time.

So my 3 questions are:

1: Does the stale form problem happen because of the instance?
2: Is there a way to get a reference to the instance? With solutionModel.getForm("base_lookup8B9BCCE8-0E21-4768-8D5D-93FA9F3991CE") it looks like I get a reference to the original form "base_lookup".
3: Is there a way to get rid of an instance? E.g. application.removeFormInstance() or something.


Thanks Gregory
gk1441607435
 
Posts: 12
Joined: Mon Sep 07, 2015 8:30 am

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