When using javascript in pdf its not working in all browsers

Question

When inject javascript in file and give that reference in pdf its not working in all browser using itextsharp using pdfstamper..

function Signature1() {
  this.getField('BtnSignature').display = display.hidden;
  this.getField('Text1').display = display.visible;
  var cResponse=app.response({cQuestion:'Enter your Name',cTitle:'SIGNATURE'});
if(cResponse==null)
{app.alert('please enter name');cResponse=0;}
else
{this.getField('Text1').value=cResponse;this.getField('BtnSignature1').setFocus();} 
}

code side

Rectangle rect;
            rect = new Rectangle(pos.Left, pos.Bottom, pos.Right, pos.Top);
            PushbuttonField button = new PushbuttonField(pdfStamper.Writer, rect, "BtnSignature");
            button.BackgroundColor = new GrayColor(0.75f);
            button.BorderColor = GrayColor.GRAYBLACK;
            button.BorderWidth = 1;
            button.BorderStyle = PdfBorderDictionary.STYLE_BEVELED;
            button.TextColor = GrayColor.GRAYBLACK;
            button.FontSize = 9;
            button.Text = "Sign Here";
            button.Layout = PushbuttonField.LAYOUT_ICON_LEFT_LABEL_RIGHT;
            button.ScaleIcon = PushbuttonField.SCALE_ICON_ALWAYS;
            button.ProportionalIcon = true;
            button.IconHorizontalAdjustment = 0;
            button.Visibility = PushbuttonField.VISIBLE_BUT_DOES_NOT_PRINT;
            field = button.Field;

            //string strJava = string.Empty;
            //strJava = "this.getField('BtnSignature').display = display.hidden;";
            //strJava += "this.getField('Text1').display = display.visible;var cResponse=app.response({cQuestion:'Enter your Name',cTitle:'SIGNATURE'});if(cResponse==null){app.alert('please enter name');cResponse=0;}else{this.getField('Text1').value=cResponse;this.getField('BtnSignature1').setFocus();}";
            field.Action = PdfAction.JavaScript("this.Signature1()", pdfStamper.Writer);