ELowell at 19:02, 17 June 2015

2015-06-17T19:02:12Z

← Older revision		Revision as of 19:02, 17 June 2015
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	{{Template:Web:~~ScreenOutputCallback~~ subtitle}}		{{Template:Web:ScreenInputCallback subtitle}}
	The WebScreenInputCallback property is the property that contains the method that is called after a 3270 screen is received from a client via [[Janus Web Legacy Support]] and before the HTTP response is converted into a Read Screen response.		The WebScreenInputCallback property is the property that contains the method that is called after a 3270 screen is received from a client via [[Janus Web Legacy Support]] and before the HTTP response is converted into a Read Screen response.
	==Syntax==		==Syntax==

Alex: Created page with "{{Template:Web:ScreenOutputCallback subtitle}} The WebScreenInputCallback property is the property that contains the method that is called after a 3270 screen is received from..."

2014-12-19T05:41:48Z

Created page with "{{Template:Web:ScreenOutputCallback subtitle}} The WebScreenInputCallback property is the property that contains the method that is called after a 3270 screen is received from..."

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{{Template:Web:ScreenOutputCallback subtitle}}
The WebScreenInputCallback property is the property that contains the method that is called after a 3270 screen is received from a client via [[Janus Web Legacy Support]] and before the HTTP response is converted into a Read Screen response.
==Syntax==
{{Template:Web:ScreenInputCallback syntax}}
===Syntax terms===
<table class="syntaxTable">
<tr><th>%webScreenCallback</th><td><var>[[WebScreenCallback type|WebScreenCallback]]</var> object</td></tr>
<tr><th nowrap="true"><var>%(Web)</var></th>
<td>The class name in parentheses denotes a shared method. <var>ScreenInputCallback</var> can also be invoked via a <var>Web</var> object variable, which may be <var>Null</var>.</td></tr>
</table>
==Usage notes==
<ul>
<li>The ScreenInputCallback function is called with no parameters. The function can examine incoming content by retrieving the data with the [[$Web_Input_Content]] function. Unlike [[ScreenOutputCallback (Web property)|ScreenOutputCallback]], however, it cannot modify the incoming data. The incoming data can be either HTTP form-encoded data or MML (for [[Janus Web Legacy XML Support]]. The ScreenOutputCallback function can also examine request header parameters, including the URL.</li>
<li>If the ScreenInputCallback returns a False or a null, an exception will be thrown before the page is sent to the client.</li>
<li>The ScreenInputCallback can, of course, also throw an exception.</li>
<li>ScreenInputCallback has no effect on non-web threads and has virtually no overhead on non-web threads.</li>
<li>There can only be one ScreenInputCallback active in any request and a ScreenInputCallback is only active for the life of the request.</li>
</ul>
==Examples==
The following example checks for a URL parameter that indicates a web service request and throws an exception if it is found:
<p class="code">local function checker is boolean

if $web_url_parm('webService') eq 'true' then
return false
end if

return true

end function

%(web):screenInputCallback = checker
...
</p>
==See also==
{{Template:Web:ScreenInputCallback footer}}

ScreenInputCallback (Web property) - Revision history

ELowell at 19:02, 17 June 2015

Alex: Created page with "{{Template:Web:ScreenOutputCallback subtitle}} The WebScreenInputCallback property is the property that contains the method that is called after a 3270 screen is received from..."