how to set one of 3 textfields to be mandatory


in pdf form need 1 of 3 telephone fields mandatory @ least 1 telepnone number in form

that require using script perform entire validation , submit process, bit of overkill...

one alternative set required (hidden) text field concatenate values of 3 fields, if empty empty validation process fail.

if fields named phone1, phone2 , phone3 can use code custom calculation code of field:

event.value = this.getfield("phone1").valueasstring + this.getfield("phone2").valueasstring + this.getfield("phone3").valueasstring; 


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