Eval and Webclient

Classic Servoy
1

the eval in webclient procude different behaviour between two servers:

Server Dev
JDK Information
java.vm.name=Java HotSpot™ Client VM
java.vm.version=11.0-b16
java.vm.info=mixed mode, sharing
java.vm.vendor=Sun Microsystems Inc.
Operating System Information
os.name=Windows 2003
os.version=5.2
os.arch=x86
Everything is ok

Prod Server
JDK Information
java.vm.name=Java HotSpot™ Client VM
java.vm.version=11.3-b02
java.vm.info=mixed mode, sharing
java.vm.vendor=Sun Microsystems Inc.
Operating System Information
os.name=Windows 2003
os.version=5.2
os.arch=x86
I’ve got couldn’t eval the string …

Do you have any idea ?

2

And what is your question?

3

Sorry the question wasn’t really clear

I’ve got “couldn’t eval the string …” in the prod server log

Did you already have any strange eval behaviour between two java version ?

4

I noticed also a problem with eval()

I already created an issue in the support database. Case 217097

In Eclipse I get the following error:

Source not found for module [C:/Users/Martin/servoy_workspace_development/MOD_RSS_HTMLTree/globals.js#645(eval): 1]

5

what are you trying to eval?

6

Ive got mostly the error when i try to eval
myvariable = globals.myfunction()
or
myvariable = globals.myfunction(‘arg1’,‘arg2’)

7

Johan,

See my case 217097. I added some coding how I tried to eval.

I use eval() in several ways:

str = 'globals.myMethod'
if (eval(str))  // To test if method exists
{
eval(str)(args)
}

But also

str = 'globals.myVar'
if (eval(str) == 1) // To test if this variable has value 1

And also

str = 'globals.myVar'
if (some test)
  str += ' = 1'
else
 str += ' = 2';
eval(str)  // Set variable to 1 or 2

And also

str = 'globals.myVar'
if (some test)
  str += ' [1]'
else
 str += ' [2]';
str += ' = 3'
eval(str) // Give some array value the value 3

Of course these example are quite simple, but it shows the way eval() is used. I worked fine in 3.5 and some of the coding was originally written in 2.2!

By the way, I tried also the following and that is working, so it looks like it is perhaps eval() in combination with if-statement

str = 'globals.myVar'
val = eval(str)
if (val == 1) // To test if this variable has value 1
8

erdione:
Ive got mostly the error when i try to eval
myvariable = globals.myfunction()
or
myvariable = globals.myfunction(‘arg1’,‘arg2’)

so you are doing

eval(“myvariable = globals.myfunction()”);

why would you eval that?

9

martinh:
Johan,

See my case 217097. I added some coding how I tried to eval.

I use eval() in several ways:

why are you evalling that kind of stuff like that?

why not just

if (globals[‘mymethod’])
{
globals’mymethod’
}

way faster then evalling.

10

I eval that because for example myfunction can be dynamically change (in my case database driven)

11 
myvariable = globals[dynamicname]();

should work fine and even better/faster.

12

jcompagner:

martinh:
Johan,

See my case 217097. I added some coding how I tried to eval.

I use eval() in several ways:

why are you evalling that kind of stuff like that?

why not just

if (globals[‘mymethod’])
{
globals’mymethod’
}

way faster then evalling.

Because mymethod is a variable name (callback method)

13 
globals[variableHoldingTheNameOfTheMethodYouWantToCall]()

really guys, eval is almost never needed…

14

OK, I’ll see if I can change my code, but how about the following:

var _method = arguments[0];

if (eval(_method))
{
   eval(_method)()
}

And the argument that I get, is a method on a form

So Arguments 0 = forms.myForm.myMethod

15 
function test()
{
	var name = "called"; // arguments[0];
	var argument = "from test";
	this[name](argument);
}

function called()
{
	application.output("called with argument: " + arguments[0])
}