When using javascript in pdf its not working in all browsers - itext

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);