Signature completes and then required fields identified

My form has required fields and I want to identify blanks before applying the electronic signature and then emailing.

I need the JS to work in the following order

1. Check for blank required fields

2. If complete apply signature and then save the file

3. Prompt emailing the document

I am using the following Java Script in the Digital Signature Properties under the Signed tab.

The end user will use DC reader.

Thanks for the help.

var requiredFields = new Array();

for (var i = 0; i < this.numFields; i++)

{

var fName = this.getNthFieldName(i);

var f = this.getField(fName);

if (f.type!="button" && this.getField(fName).required && (this.getField(fName).value == null || this.getField(fName).value == ''))

{

requiredFields[requiredFields.length] = fName;}}

var error = "Please complete the following fields: \n\n";

for (j=0; j < requiredFields.length; j++)

{

if (requiredFields.value == null)

{

error = error + requiredFields + '\n';

var f2 = this.getField(requiredFields);

f2.setFocus();

}

}

if(requiredFields.length > 0)

app.alert(error);

for(var i=0;i<this.numFields;i++)

{

    var cFldName = this.getNthFieldName(i);

    var oFld = this.getField(cFldName);

    if(oFld.required && (oFld.defaultValue == oFld.value))

    {

        app.alert("Field " + cFldName + " is empty");

    }

}

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

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

if (f.type!= "signature") //

{

f.readonly = true ;

}

}

this.mailDoc({cTo:"", cSubject: "Purchase Request",  cMsg: "Please review and electronically Sign Document"});