Submit button problem

[James28365060ucf2]

var E_FieldName = [];
for (var i=0; i<this.numFields; i++) {

var f= this.getField(this.getNthFieldName(i));

if (f.type!="button" && f.required ) {

if ((f.type=="text" && f.value=="") || (f.type=="checkbox" && f.value=="Off")) E_FieldName.push(f.name);

}

}

if (E_FieldName.length>0) {

app.alert("Error! You must fill in the following fields:\n" + E_FieldName.join("\n"));

}

I get undefined, because of array

[James28365060ucf2]

Please help anybody 

[Nesa Nurani]

It looks ok. Are your fields set to required?

[try67]

"undefined" is not an error. What do you expect to happen?

[James28365060ucf2]

never mind I adjusted my code with some changes to make it work, thank you so much for all the replies