$Web Num: Difference between revisions
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{{DISPLAYTITLE:$Web_Num}} | {{DISPLAYTITLE:$Web_Num}} | ||
<span class="pageSubtitle" | <span class="pageSubtitle">Number of isindex and form fields</span> | ||
<var>$Web_Num</var> retrieves the number of isindex and form fields in a URL. | <var>$Web_Num</var> retrieves the number of isindex and form fields in a URL. | ||
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==Syntax== | ==Syntax== | ||
<p class="syntax">< | <p class="syntax"><span class="term">%count</span> = <span class="literal">$Web_Num</span>( [<span class="term">fieldname</span>] ) | ||
< | </p> | ||
===Syntax terms=== | ===Syntax terms=== | ||
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==Usage notes== | ==Usage notes== | ||
<ul> | <ul> | ||
<li><var>$Web_Num</var> first counts isindex fields and then form fields. <var>$Web_Num</var> can be used instead of <var>[[$ | <li><var>$Web_Num</var> first counts isindex fields and then form fields. <var>$Web_Num</var> can be used instead of <var>[[$Web_Num_IsIndex]]</var> and <var>[[$Web_Num_Form]]</var> to make it easy to switch between using "method=GET" and "method=POST" <code><form></code> tags and simply to save typing. | ||
<li>For a discussion of isindex and form requests and data, see [[Janus Web Server application coding considerations#URL parameters or isindex data| | <li>For a discussion of isindex and form requests and data, see [[Janus Web Server application coding considerations#URL parameters or isindex data|URL parameters or isindex data]]. | ||
</ul> | </ul> | ||
Latest revision as of 17:18, 10 October 2014
Number of isindex and form fields
$Web_Num retrieves the number of isindex and form fields in a URL.
$Web_Num takes a single optional argument and returns a number.
Syntax
%count = $Web_Num( [fieldname] )
Syntax terms
| fieldname | Specifies to count only the isindex and form fields that match fieldname. If omitted, returns the count of all isindex and form fields. |
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Usage notes
- $Web_Num first counts isindex fields and then form fields. $Web_Num can be used instead of $Web_Num_IsIndex and $Web_Num_Form to make it easy to switch between using "method=GET" and "method=POST"
<form>tags and simply to save typing. - For a discussion of isindex and form requests and data, see URL parameters or isindex data.
Examples
An application written to handle isindex and form fields generically would need to determine the number of isindex and form fields in a URL before finding the names of the fields.
%I_COUNT = $Web_Num FOR %I FROM 1 TO %I_COUNT %RC = $SETG($Web_Name(%I), $Web_Parm(,%I)) END FOR
In this example, a global variable is set to contain the values of all isindex and form fields set by the browser. The name of the global is the name of the form or isindex field and its value is, of course, the form or isindex field value. This example will not work correctly if there are two or more isindex and/or form fields that share the same name. Multiple fields with the same name are common occurrences in HTML forms, especially in <select> lists that generate a fieldname/value pair for each item selected from the list.