PDF form with Adobe Acrobat Pro DC- limit the number of check boxes selected

Question

Hi there.I have created a PDF form with Adobe Acrobat Pro DC.This example is a catering form where there are 4 meats to choose from. The customer can only select two meats. If they try to select a third meat, then I want it to deselect the meat that they just tried to select. I tried this using meat1.meat2,meat3 and meat4 as checkboxes. I am not familiar with javascript, so please can you type out what I need to.thank you so much

marcusb58143956 · Accepted Answer

Thank you so much, this works perfectly!

try67 · Answer

It was a bit tricky (especially the part where the value is rejected), but I think I was able to do it.

Create a new (hidden) text field and use this code as its custom validation calculation script:

if (event.source && /^meat\d$/.test(event.source.name)) {
    var counter = 0;
    for (var i=1; i<=4; i++) {
        if (this.getField("meat"+i).value!="Off")
            counter++;
    }
    if (counter>2) {
        app.alert("Error! Maximum 2 meats are allowed.");
        this.resetForm([event.source.name]);
    }
}

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