# Initializing values in the ControlP5 button library
**URL:** https://discourse.processing.org/t/initializing-values-in-the-controlp5-button-library/17578
**Category:** Libraries
**Created:** [February 6, 2020, 4:52am UTC](https://discourse.processing.org/t/initializing-values-in-the-controlp5-button-library/17578 "2020-02-06T04:52:11Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@spflanze](https://discourse.processing.org/u/spflanze)
#### Post date: [February 6, 2020, 4:52am UTC](https://discourse.processing.org/t/initializing-values-in-the-controlp5-button-library/17578/1 "2020-02-06T04:52:11Z")
In the below code snippet I find the “.setValue(0)” line triggers the “BrowseOpenOutputFile()” event handler.This caused an undesired file browser dialog (called in the event handler code) to appear at sketch startup. Is there a way to set the value without triggering the event during initialization?
```auto
jControl = new ControlP5(this);
jControl.addButton("BrowseOpenOutputFile")
// .setValue(0) // Not called because it triggers the event handler
.setLabel("Open Output File")
.setSize( 100, 20 )
.setPosition(200,0)
.setColor( DataToggleColors )
.updateSize()
;
```
---
### Author:  [@jeremydouglass](https://discourse.processing.org/u/jeremydouglass)
#### Post date: [February 19, 2020, 5:56am UTC](https://discourse.processing.org/t/initializing-values-in-the-controlp5-button-library/17578/2 "2020-02-19T05:56:54Z")
Were you able to resolve this issue?
I’m not certain that I understand what you are trying to do. Are you trying to call setValue(0) on a ControlP5.Button? Why? This just passes `0` to your callback function. If you don’t want to do this, don’t call Button.setValue().
For examples of how this is used, see the Examples in the ControlP5 Button documentation.
[http://www.sojamo.com/libraries/controlP5/reference/controlP5/Button.html](http://www.sojamo.com/libraries/controlP5/reference/controlP5/Button.html)
---
### Author:  [@micycle](https://discourse.processing.org/u/micycle)
#### Post date: [February 19, 2020, 3:36pm UTC](https://discourse.processing.org/t/initializing-values-in-the-controlp5-button-library/17578/3 "2020-02-19T15:36:43Z")
Call `.setValue(0)` before you register the callback.
---
### Author:  [@jeremydouglass](https://discourse.processing.org/u/jeremydouglass)
#### Post date: [February 19, 2020, 4:31pm UTC](https://discourse.processing.org/t/initializing-values-in-the-controlp5-button-library/17578/4 "2020-02-19T16:31:04Z")
@micycle you mean, call setValue() directly on the ControlP5 instance? Why?
---
### Author:  [@micycle](https://discourse.processing.org/u/micycle)
#### Post date: [February 19, 2020, 5:01pm UTC](https://discourse.processing.org/t/initializing-values-in-the-controlp5-button-library/17578/5 "2020-02-19T17:01:22Z")
I mean calling it on the button (which is what his code is doing now).
---
### Author:  [@jeremydouglass](https://discourse.processing.org/u/jeremydouglass)
#### Post date: [March 5, 2020, 9:20pm UTC](https://discourse.processing.org/t/initializing-values-in-the-controlp5-button-library/17578/6 "2020-03-05T21:20:55Z")
Here is a quick working example. A key issue here is that both `cp5.addButton("theFunction")` and `new Button(cp5, "theFunction")` seem to have the same result – so one solution is to pass “” and then add a callBack after. If someone knows a more elegant way, please share.
```auto
/**
* CP5ButtonThenCallBack
* CP5 set button value THEN register callback
* 2020-03-05 Jeremy Douglass -- Processing 3.4
* Do this to avoid passing a value on init that triggers the callback.
* Discussion:
* https://discourse.processing.org/t/initializing-values-in-the-controlp5-button-library/17578/5
*/
import controlP5.*;
ControlP5 cp5;
void setup() {
size(200, 200);
cp5 = new ControlP5(this);
// 1. create the button with no callback
Button aButton = new Button(cp5, ""); // (cp5, "mybutton")
// 2. configure the button
aButton.setValue(0)
.setLabel("Open Output File")
.setSize( 100, 20 )
.setPosition(10, 10)
.updateSize();
// 3. register the callback -- see example from:
// forum.processing.org/one/topic/controlp5-button-callback-runs-on-program-launch-without-mouse-click.html
aButton.addCallback(
new CallbackListener() {
public void controlEvent(CallbackEvent event) {
if (event.getAction() == ControlP5.ACTION_RELEASED) {
mybutton();
}
}
}
);
}
void draw(){}
void mybutton () {
println("mybutton");
}
```