grp.listen init, value - Printable Version

grp.listen init, value - Printable Version

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+--- Thread: grp.listen init, value (/showthread.php?tid=2328)

grp.listen init, value - buuuudzik - 06.11.2019

I've found that grp.listen() when when it has last optional param set to true, then it initially runs 2 times: 1) state=="init", 2) state=="value"

I think state=="value" should only run when value change or update on a bus, this is logically separated from "init".

RE: grp.listen init, value - admin - 08.11.2019

This is intended behavior. You can ignore init state and/or use a variable to check if this is the first time that callback is called.

RE: grp.listen init, value - DGrandes - 09.12.2020

Hi!

Is there any way to use grp.listen() when an object updates but not changes?

I´m doing a emergent notification and many times the message is the same. Object updates but function inside JS doesn´t run.

Code:
grp.listen("33/1/255", function(object,state) {
    if (state == 'value') {
      console.log('Show message')
      setTimeout(function(){
       console.log('Hide Messase')
      }, 4500);
    }
});

RE: grp.listen init, value - admin - 09.12.2020

Add a third argument (true) to grp.listen to catch all messages. You also need to clear the timeout on each value update otherwise your function won't work correctly.

Code:
$(function() {
  var timeout;
  grp.listen("33/1/255", function(object,state) {
    if (state == 'value') {
      console.log('Show message');
      clearTimeout(timeout);
      timeout = setTimeout(function(){
       console.log('Hide Messase');
      }, 4500);
    }
  }, true);
});

RE: grp.listen init, value - DGrandes - 09.12.2020

(09.12.2020, 09:28)admin Wrote: Add a third argument (true) to grp.listen to catch all messages. You also need to clear the timeout on each value update otherwise your function won't work correctly.

Code:
$(function() { var timeout; grp.listen("33/1/255", function(object,state) { if (state == 'value') { console.log('Show message'); clearTimeout(timeout); timeout = setTimeout(function(){ console.log('Hide Messase'); }, 4500); } }, true); });

Ok Thanks!