How to have 3 checkboxes when checked, check a fourth text box

Question

I need the javascript code that would allow me to have a check box (box1) to be automatically checked, when three check boxes (box2, box3, box4) are all checked. If one of the three check boxes are unchecked, then check box (box1) becomes unchecked as well.

Also, check box1 cannot be unchecked or checked manually.

Hopefully that makes sense.

Thanks,

Dave

try67 · Answer

Create a (hidden) text field with the following custom calculation script:

var a = this.getField("box2").valueAsString!="Off";
var b = this.getField("box3").valueAsString!="Off";
var c = this.getField("box4").valueAsString!="Off";
this.getField("box1").checkThisBox(0, a && b && c);

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