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node-red/nodes/core/core/25-catch.html
2015-02-26 22:40:54 +00:00

63 lines
2.4 KiB
HTML

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Copyright 2015 IBM Corp.
Licensed under the Apache License, Version 2.0 (the "License");
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<p>Catch errors thrown by nodes on the same tab.</p>
<p>If a node throws a error whilst handling a message, the flow will typically
halt. This node can be used to catch those errors and handle them with a
dedicated flow.</p>
<p>The node will catch errors thrown by any node on the same tab. If there
are multiple catch nodes on a tab, they will all get triggered.</p>
<p>If an error is thrown within a subflow, the error will get handled by any
catch nodes within the subflow. If none exists, the error is propagated
up to the tab the subflow instance is on.</p>
<p>The message sent by this node will be the original message if the node that
threw the error provided it. The message will have an <code>error</code>
property with the following attributes:
<ul>
<li><code>message</code> : the error message</li>
<li><code>source.id</code> : the id of the node that threw the error</li>
<li><code>source.type</code> : the type of the node that threw the error</li>
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<p>If the message already had a <code>error</code> property, it is copied to <code>_error</code>.</p>
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