topic Re: Evaluate expression in extension in Integration, Extension & APIs

Evaluate expression in extension

oz_moyal — Tue, 01 May 2018 20:13:47 GMT

Hi,

i'm developing an extension

I need to evaluate expression only when a button is pressed

i saw that the Engine API has evalulate method, which is what i need

I just not sure how can I access the Engine API from my extension ?

Any example would be appreciated

thanks!

ErikWetterberg — Wed, 02 May 2018 04:32:49 GMT

Vi,

I have written about this here:

Erik Wetterberg

ErikWetterberg — Wed, 02 May 2018 06:58:29 GMT

Hi,

Another option is of course to add the expression to the extensions properties. The result will then be in the layout

Erik Wetterberg.

oz_moyal — Wed, 02 May 2018 07:15:58 GMT

Yes, i know that

the problem is that this expression is actually initiating a server side extension

and we want to control when it is being called, so we want to do it only when button is pressed (when it is in the properties is always calculated)

At the end i managed to do it like this (in the paint function):

function btn_cilck(){

app.createGenericObject( {

sse_reply: {

qStringExpression: "={my expression})"

}

}, function ( reply ) {

var str = " sse_reply:" + reply.sse_reply;

//we need to destroy it now, other wise it will refresh it on any future reload (without click)

app.destroySessionObject(reply.qInfo.qId);

alert(str);

});

}

And thanks for the post about how to use Enigma, VERY helpful!