JavaScript DHTML/Form Control/Form Help — различия между версиями

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Текущая версия на 07:21, 26 мая 2010

Creating Context-Sensitive Help

/*
JavaScript Bible, Fourth Edition
by Danny Goodman 
John Wiley & Sons CopyRight 2001
*/

<HTML>
<HEAD>
<SCRIPT LANGUAGE="JavaScript">
function showNameHelp() {
    alert("Enter your first and last names.")
    event.cancelBubble = true
    return false
}
function showYOBHelp() {
    alert("Enter the four-digit year of your birth. For example: 1972")
    event.cancelBubble = true
    return false
}
function showGenericHelp() {
    alert("All fields are required.")
    event.cancelBubble = true
    return false
}
function showLegend() {
    document.all.legend.style.visibility = "visible"
}
function hideLegend() {
    document.all.legend.style.visibility = "hidden"
}
function init() {
    var msg = ""
    if (navigator.userAgent.indexOf("Mac") != -1) {
        msg = "Press \"help\" key for help."
    } else if (navigator.userAgent.indexOf("Win") != -1) {
        msg = "Press F1 for help."
    }
    document.all.legend.style.visibility = "hidden"
    document.all.legend.innerHTML = msg
}
</SCRIPT>
</HEAD>
<BODY onLoad="init()" onHelp="return showGenericHelp()">
<H1>onHelp Event Handler</H1>
<HR>
<P ID="legend" STYLE="visibility:hidden; font-size:10px">&nbsp;</P>
<FORM>
Name: <INPUT TYPE="text" NAME="name" SIZE=30 
    onFocus="showLegend()" onBlur="hideLegend()"
    onHelp="return showNameHelp()">
<BR>
Year of Birth: <INPUT TYPE="text" NAME="YOB" SIZE=30 
    onFocus="showLegend()" onBlur="hideLegend()"
    onHelp="return showYOBHelp()">
</FORM>
</BODY>
</HTML>
Источник — «http://wbex.ru/index.php?title=JavaScript_DHTML/Form_Control/Form_Help&oldid=2523»