JavaScript Tutorial/Document/Tag Reference

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Get form TextField value

<HTML>
<HEAD>
<SCRIPT language="JavaScript">
<!--
function check_it()
{
   var thetext=document.myForm.the_time.value;
   if (thetext.indexOf("a") == -1)
   {
     window.alert("a should in between");
     return false;
   }
   else
   {
   return true;
   }
}
//-->
</SCRIPT>
</HEAD>
<BODY>
<FORM name="myForm" action="#" onSubmit="return check_it();">
What time is it?<BR>
<INPUT type="text" name="the_time">
<BR>
<INPUT type="submit" value="Submit">
</BODY>
</HTML>


Reference your tags in document

<HTML>
<HEAD>
<SCRIPT language="JavaScript">
<!--
function newpage()
{
 var thename= document.myform.yourname.value;
 var thefood= document.myform.yourfood.value;
 document.open();
 document.write("Your name is "+thename);
 document.write("<BR>");
 document.write("Your favorite food is "+thefood);
 document.close();
}
//-->
</SCRIPT>
</HEAD>
<BODY>
<FORM name="myform">
Name: <INPUT type="text" name="yourname" size="25">
<P>
Favorite Food: <INPUT type="text" name="yourfood" size="25">
<P>
<INPUT TYPE="button" value="Click Here for a New Page" onClick="newpage()">
</FORM>
</BODY>
</HTML>
Источник — «http://wbex.ru/index.php?title=JavaScript_Tutorial/Document/Tag_Reference&oldid=8901»