$Web: Difference between revisions
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<li>It is syntactically simple and easy to understand. | <li>It is syntactically simple and easy to understand. | ||
<li>It works correctly even when a request is being debugged using JANUSDEBUG. | <li>It works correctly even when a request is being debugged using JANUSDEBUG. | ||
<li>It works correctly and does not cause a "CONNECTION WAS LOST" user restart after the connection was closed either with a $Web_Done or by the browser. This can be especially useful if there is web-specific processing, like APSY navigation code, that happens after a $Web_Done. | <li>It works correctly and does not cause a "CONNECTION WAS LOST" user restart after the connection was closed either with a <var>$Web_Done</var> or by the browser. This can be especially useful if there is web-specific processing, like APSY navigation code, that happens after a $Web_Done. | ||
</ol> | </ol> | ||
[[Category:Janus Web Server $functions|$Web]] | [[Category:Janus Web Server $functions|$Web]] | ||
Revision as of 19:06, 6 June 2012
<section begin="desc" />Determine whether running a web request<section end="desc" />
$Web indicates whether the current processing is the result of a request to Janus Web Server.
Syntax
<section begin="syntax" /> %RC = $Web <section end="syntax" />
$Web takes no arguments and returns either a 0 or a 1.
| Code | Meaning |
|---|---|
| 0 | Not running a web request. |
| 1 | Running a web request. |
$WEB return codes
The $Web function is most useful for preventing code that should only be run for a web request from running for 3270 (or other non-web) requests and for ensuring that non-web, possibly 3270 specific code is not run for web requests.
IF $Web THEN %DISTRICT = $Web_Form_Parm('DISTRICT') ELSE %DISTRICT = %QUERY:DISTRICT END IF
In this example, the variable %DISTRICT is set from a form field when running a web request and from a screen field otherwise. $Web has several advantages over other techniques for determining whether a request is running a web request such as checking $Web_Port or doing a $VIEW('IODEV'):
- It is syntactically simple and easy to understand.
- It works correctly even when a request is being debugged using JANUSDEBUG.
- It works correctly and does not cause a "CONNECTION WAS LOST" user restart after the connection was closed either with a $Web_Done or by the browser. This can be especially useful if there is web-specific processing, like APSY navigation code, that happens after a $Web_Done.