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+\documentclass{article}
+\usepackage[designiv]{web}
+\usepackage[usehyforms]{grayhints}
+
+\addtoWebHeight{1in}
+\def\cs#1{\texttt{\char`\\#1}}
+\parindent0pt
+
+
+\begin{document}
+\begin{Form}
+\begin{center}\large\bfseries Gray Hints
+\end{center}
+The `gray hint' technique requires modifications to the Format,
+Keystroke, OnFocus, and OnBlur events.\medskip
+
+\renewcommand\LayoutTextField[2]{#2}
+\renewcommand\LayoutChoiceField[2]{#2}
+
+\TextField[%
+ name={Name.First},
+ height=11bp,
+ width=2in,
+ color={\matchGray},
+ keystroke=\KeyToGray,
+ format={\FmtToGray{First Name}},
+ onfocus={\FocusToBlack},
+ onblur={\BlurToBlack}]{First Name:}\quad
+\TextField[%
+ name={Name.Laat},
+ height=11bp,
+ width=2in,
+ color={\matchGray},
+ keystroke=\KeyToGray,
+ format={\FmtToGray{Last Name}},
+ onfocus={\FocusToBlack},
+ onblur={\BlurToBlack}]{}\medskip
+
+\TextField[%
+ name=Datefield,
+ height=11bp,
+ width=1in,
+ color={\matchGray},
+ keystroke={AFDate_KeystrokeEx("yyyy/mm/dd");\KeyToGray},
+ format={AFDate_FormatEx("yyyy/mm/dd");\FmtToGray{yyyy/mm/dd}},
+ onfocus={\FocusToBlack},
+ onblur={\BlurToBlack}]{}\medskip
+
+The next three fields perform calculations, the last one is the sum of the
+first two. These are fields formatted as numbers. To prevent `Total' field
+from displaying a zero (0) when the dependent fields are empty (and to
+display its gray hint instead), a document JavaScript function was developed,
+named \texttt{AllowCalc(cArray)}. This function returns \texttt{true} if any
+of the fields listed in \texttt{cArray} has a value and returns
+\texttt{false}, otherwise.\smallskip
+
+\TextField[%
+ name=Integer.First,
+ height=11bp,
+ width=1in,
+ color={\matchGray},
+ keystroke={AFNumber_Keystroke(0,1,0,0,"",true);\KeyToGray},
+ format={AFNumber_Format(0,1,0,0,"",true); \FmtToGray{First Integer}},
+ onfocus=\FocusToBlack,
+ onblur=\BlurToBlack
+]{}\smallskip
+
+\TextField[%
+ name=Integer.Second,
+ height=11bp,
+ width=1in,
+ color=\matchGray,
+ keystroke={AFNumber_Keystroke(0,1,0,0,"",true); \KeyToGray},
+ format={AFNumber_Format(0,1,0,0,"",true); \FmtToGray{Second Integer}},
+ onfocus=\FocusToBlack,
+ onblur=\BlurToBlack
+]{}\smallskip
+
+\TextField[%
+ name=TotalNumber,
+ height=11bp,
+ width=1in,
+ color=\matchGray,
+ keystroke={AFNumber_Keystroke(0,1,0,0,"",true);\KeyToGray},
+ format={AFNumber_Format(0,1,0,0,"",true); \FmtToGray{Total}},
+ calculate={var cArray=new Array("Integer");
+ if (AllowCalc(cArray))AFSimple_Calculate("SUM", cArray ); \CalcToGray},
+ onfocus=\FocusToBlack,
+ onblur=\BlurToBlack
+]{}\medskip
+
+The gray hint technique can apply to editable combo boxes as well.\smallskip
+
+\ChoiceMenu[%
+ name=combo,
+ combo,
+ width=1.65in,
+ height=11bp,
+ color={\matchGray},
+ edit,
+ keystroke=\KeyToGray,
+ format={\FmtToGray{Enter your favorite food}},
+ onfocus=\FocusToBlack,
+ onblur=\BlurToBlack
+]{}{Meat,Potatoes,Rice,Onions,Pickles}\medskip
+
+The color scheme of the gray hints can be changed using
+\cs{normalGrayColors}. The initial value of \cs{textColor}, which sets the
+color of the text, must match, for appearance sake, the choice for the gray
+color; for this reason, the \cs{matchGray} command was developed.\smallskip
+
+\normalGrayColors{color.blue}{color.magenta}
+
+\TextField[%
+ name=Pet,
+ width=1in,
+ height=11bp,
+ color=\matchGray,
+ keystroke=\KeyToGray,
+ format=\FmtToGray{Pet's name},
+ onfocus=\FocusToBlack,
+ onblur=\BlurToBlack
+]{Pet}\medskip
+
+\PushButton[%
+ height=11bp,
+ name=reset,
+ onclick={this.resetForm();}]{Reset}\medskip
+
+\end{Form}
+\end{document}