📄 web_error.zhtml
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<!-- This file shows how to user the error messages generated by the WEB_ERROR()
feature. See the tags in the <FORM> ... </FORM> section. -->
<HTML>
<HEAD>
<TITLE>WEB_ERROR() and Displaying Error Messages</TITLE>
</HEAD>
<BODY>
<H1>WEB_ERROR() and Displaying Error Messages</H1>
<!-- The following if statement checks if there is an error on the temperature
variable. -->
<?z if (error($temperature)) { ?>
<!-- Note in the following message that the echo statement displays the
error message generated by the #web guards for the temperature
variable. -->
The temperature variable is in error! The value is
<?z echo(error($temperature)) ?>.
<P>
<?z } ?>
<FORM ACTION="/index.zhtml" METHOD="POST">
<TABLE>
<!-- The following row in the table is for the temperature variable. -->
<TR>
<TD>temperature</TD>
<TD>
<INPUT TYPE="text" NAME="temperature" VALUE="<?z echo($temperature) ?>">
</TD>
</TR>
</TABLE>
<P>
<INPUT TYPE="submit" VALUE="Submit">
<INPUT TYPE="reset" VALUE="Reset">
</FORM>
</BODY>
</FORM>
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