mirror of
https://github.com/node-red/node-red.git
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218794be77
* initial support of merge mode of JOIN node * initial support of reduce mode of JOIN node * update info document of JOIN node * add tests for merge & reduce mode of JOIN node * tidy tabs & spaces * add test for too many pending messages & related fixes * add an test for reduce mode of JOIN node * change order of modes of SWITCH node * add initial topics entry of merge mode * fixed descriptions on "reduce right" checkbox * fixed update of typedInput field of reduce mode * fixed a typo in info document of JOIN node * allow empty string in JSONata input field of reduce mode * fixed a typo * fixed error in reduce mode description
542 lines
27 KiB
HTML
542 lines
27 KiB
HTML
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Copyright JS Foundation and other contributors, http://js.foundation
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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<h3>Inputs</h3>
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<dl class="message-properties">
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<dt>payload<span class="property-type">object | string | array | buffer</span></dt>
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<dd>The behaviour of the node is determined by the type of <code>msg.payload</code>:
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<li><b>string</b>/<b>buffer</b> - the message is split using the specified character (default: <code>\n</code>), buffer sequence or into fixed lengths.</li>
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<h3>Outputs</h3>
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<dl class="message-properties">
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<dt>parts<span class="property-type">object</span></dt>
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<dd>This property contains information about how the message was split from
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the original message. If passed to the <b>join</b> node, the sequence can be
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reassembled into a single message. The property has the following properties:
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<ul>
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<li><code>id</code> - an identifier for the group of messages</li>
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<li><code>index</code> - the position within the group</li>
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<li><code>count</code> - if known, the total number of messages in the group. See 'streaming mode' below.</li>
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<li><code>type</code> - the type of message - string/array/object/buffer</li>
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<li><code>ch</code> - for a string or buffer, the data used to the split the message as either the string or an array of bytes</li>
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<li><code>key</code> - for an object, the key of the property this message was created from. The node can be configured to also copy this value to another message properties, such as <code>msg.topic</code>.</li>
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<li><code>len</code> - the length of each message when split using a fixed length value</li>
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</ul>
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</dd>
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</dl>
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<h3>Details</h3>
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<p>This node makes it easy to create a flow that performs common actions across
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a sequence of messages before, using the <b>join</b> node, recombining the
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sequence into a single message.</p>
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<p>It uses the <code>msg.parts</code> property to track the individual parts
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of a sequence.</p>
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<h4>Streaming mode</h4>
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<p>The node can also be used to reflow a stream of messages. For example, a
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serial device that sends newline-terminated commands may deliver a single message
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with a partial command at its end. In 'streaming mode', this node will split
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a message and send each complete segment. If there is a partial segment at the end,
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the node will hold on to it and prepend it to the next message that is received.
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</p>
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<p>When operating in this mode, the node will not set the `msg.parts.count`
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property as it does not know how many messages to expect in the stream. This
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means it cannot be used with the <b>join</b> node in its automatic mode</p>
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<script type="text/x-red" data-template-name="join">
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<option value="merged" data-i18n="join.type.merged"></option>
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<label style="vertical-align:top; margin-top:7px; width:auto; margin-right: 5px;" data-i18n="join.using"></label>
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<input type="text" id="node-input-key" style="width:220px;"> <span data-i18n="join.key"></span>
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<div class="form-row node-row-joiner">
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<li>
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<label style="width:280px;" for="node-input-count" data-i18n="join.afterCount"></label> <input id="node-input-count" data-i18n="[placeholder]join.count" type="text" style="width:75px;">
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</li>
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<li class="node-row-accumulate" style="list-style-type:none;">
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<input type="checkbox" id="node-input-accumulate" style="display:inline-block; width:20px; margin-left:20px; vertical-align:top;"> <label style="width: auto" for="node-input-accumulate" data-i18n="join.subsequent"></label>
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<label style="width:280px;" for="node-input-timeout" data-i18n="join.afterTimeout"></label> <input id="node-input-timeout" data-i18n="[placeholder]join.seconds" type="text" style="width:75px;">
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<li>
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<label style="width:auto; padding-top:6px;" data-i18n="[html]join.complete"></label>
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<label data-i18n="join.merge.topics-label"></label>
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<div class="form-row node-input-topics-container-row">
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<ol id="node-input-topics-container"></ol>
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<div class="form-row">
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<input type="checkbox" id="node-input-mergeOnChange" style="margin-left:10px; vertical-align:top; width:auto;">
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<label for="node-input-mergeOnChange" style="width:auto;" data-i18n="join.merge.on-change"></label>
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<div class="node-row-reduce">
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<div class="form-row">
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<input type="text" id="node-input-reduceExp" data-i18n="[placeholder]join.reduce.exp-value" style="width:65%">
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<div class="form-row">
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<input type="hidden" id="node-input-reduceInitType">
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<label for="node-input-reduceFixup" data-i18n="join.reduce.fixup" style="margin-left:10px;"></label>
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<div class="form-row">
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<label> </label>
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<input type="checkbox" id="node-input-reduceRight" style="display:inline-block; width:auto; vertical-align:top; margin-left:10px;">
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<div class="form-row">
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<label for="node-input-name"><i class="fa fa-tag"></i> <span data-i18n="common.label.name"></span></label>
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<input type="text" id="node-input-name" data-i18n="[placeholder]common.label.name">
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</div>
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<div class="form-tips form-tips-auto hide" data-i18n="[html]join.tip"></div>
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</script>
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<script type="text/x-red" data-help-name="join">
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<p>Joins sequences of messages into a single message. This node provides four mode for message combination:</p>
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<dl>
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<dt>automatic</dt>
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<dd>When paired with the <b>split</b> node, it will automatically join the messages to reverse the split that was performed.</dd>
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<dt>manual</dt>
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<dd>It will join sequences of messages in a variety of ways.</dd>
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<dt>merge sequence</dt>
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<dd>It will merge incoming messages into single message using <code>topic</code> property.</dd>
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<dt>reduce sequence</dt>
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<dd>When paired with the <b>split</b> node, it will reduce the message sequence into single message.</dd>
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</dl>
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<h3>Inputs</h3>
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<dl class="message-properties">
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<dt class="optional">parts<span class="property-type">object</span></dt>
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<dd>To automatically join a sequence of messages, they should all have
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this property set. The <b>split</b> node generates this property but it
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can be manually created. It has the following properties:
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<ul>
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<li><code>id</code> - an identifier for the group of messages</li>
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<li><code>index</code> - the position within the group</li>
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<li><code>count</code> - the total number of messages in the group</li>
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<li><code>type</code> - the type of message - string/array/object/buffer</li>
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<li><code>ch</code> - for a string or buffer, the data used to the split the message as either the string or an array of bytes</li>
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<li><code>key</code> - for an object, the key of the property this message was created from</li>
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<li><code>len</code> - the length of each message when split using a fixed length value</li>
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</ul>
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</dd>
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<dt class="optional">complete</dt>
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<dd>If set, the node will send its output message in its current state.</dd>
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</dl>
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<h3>Details</h3>
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<h4>Automatic mode</h4>
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<p>When configured to join in manual mode, the node is able to join sequences of messages using <code>parts</code> property of incoming messages.</p>
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<h4>Manual mode</h4>
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<p>When configured to join in manual mode, the node is able to join sequences
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of messages in a variety of ways.</p>
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<ul>
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<li>a <b>string</b> or <b>buffer</b> - created by joining the selected property of each message with the specified join characters or buffer.</li>
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<li>an <b>array</b> - created by adding each selected property, or entire message, to the output array.</li>
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<li>a <b>key/value object</b> - created by using a property of each message to determine the key under which
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the required value is stored.</li>
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<li>a <b>merged object</b> - created by merging the property of each message under a single object.</li>
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</ul>
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<p>The other properties of the output message are taken from the last message received before the result is sent.</p>
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<p>A <i>count</i> can be set for how many messages should be received before generating the output message.
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For object outputs, once this count has been reached, the node can be configured to send a message for each subsequent message
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received.</p>
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<p>A <i>timeout</i> can be set to trigger sending the new message using whatever has been received so far.</p>
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<p>If a message is received with the <b>msg.complete</b> property set, the output message is sent.</p>
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<h4>Merge Sequence mode</h4>
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<p>When configured to join in merge mode, the join node can create a message based on <code>topic</code> value.</p>
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<p>Input messages are merged in order specified by <b>Topics</b> value.
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<p>For example, if value of <b>Topics</b> is <b>x,x,y</b>, two input messages with topic <b>x</b> and one input message with topic <b>y</b> are merged into a new message in order of arrival.</p>
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<p>If "Send merged message on arrival of a new topic" check box is selected, the last messages with each topic is kept internally and output message is sent when a message with new topics arrives.</p>
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<p>The merged message contains <code>payload</code> property and properties for each topic. The <code>payload</code> property represents ordered array of payload value of input messages for each topic. The property for each topic represents a payload value for single occurrence of topic or array of payload values for multiple occurrences of the topic.</p>
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<h4>Reduce Sequence mode</h4>
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<p>When configured to join in reduce sequence mode, following values can be specified:</p>
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<dl class="message-properties">
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<dt>Reduce exp</dt>
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<dd>JSONata expression for reducing message group. This expression represents the accumulated result. In the expression, following special variables can be used:
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<ul>
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<li><code>$A</code> accumulated value, </li>
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<li><code>$I</code> index of the message in a group, </li>
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<li><code>$N</code> number of messages of a group.</li>
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</ul>
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</dd>
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<dt>Initial value</dt>
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<dd>
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initial value of reduction.
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</dd>
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<dt>Fixup exp</dt>
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<dd>
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JSONata expression applied after reduction of a message group completed. In the expression, following special variables can be used:
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<ul>
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<li><code>$A</code> accumulated value, </li>
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<li><code>$N</code> number of messages of a group.</li>
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</ul>
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</dd>
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<p>Order of reduction on a message group can be specified by checkbox (<b>Evaluate in reverse order (right to left)</b>).</p>
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</dl>
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<p><b>Example:</b> Join node outputs an average for each input message group with the following setting:
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<ul>
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<li><b>Reduce exp</b>: <code>$A+payload</code></li>
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<li><b>Initial value</b>: <code>0</code></li>
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<li><b>Fixup exp</b>: <code>$A/$N</code></li>
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</ul>
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</p>
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<h4>Note:</h4>
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<p>This node internally keeps messages for its operation. In order to prevent unexpected memory usage, maximum number of messages kept can be specified by <code>joinMaxKeptMsgsCount</code> property in <b>settings.js</b>.</p>
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|
</script>
|
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|
|
<script type="text/javascript">
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RED.nodes.registerType('join',{
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|
|
property: { value:"payload", validate:RED.validators.typedInput("propertyType")},
|
|
propertyType: { value:"msg"},
|
|
key: {value:"topic"},
|
|
joiner: { value:"\\n"},
|
|
joinerType: { value:"str"},
|
|
accumulate: { value:"false" },
|
|
timeout: {value:""},
|
|
count: {value:""},
|
|
topics: {value:[{topic:""}]},
|
|
mergeOnChange: {value:false},
|
|
reduceRight: {value:false},
|
|
reduceExp: {value:undefined},
|
|
reduceInit: {value:undefined},
|
|
reduceInitType: {value:undefined},
|
|
reduceFixup: {value:undefined}
|
|
},
|
|
inputs:1,
|
|
outputs:1,
|
|
icon: "join.png",
|
|
label: function() {
|
|
return this.name||"join";
|
|
},
|
|
labelStyle: function() {
|
|
return this.name?"node_label_italic":"";
|
|
},
|
|
oneditprepare: function() {
|
|
var node = this;
|
|
var topic_str = node._("join.merge.topic");
|
|
|
|
function resizeTopics(topic) {
|
|
var newWidth = topic.width();
|
|
topic.find('.red-ui-typedInput')
|
|
.typedInput("width",newWidth-15);
|
|
}
|
|
$("#node-input-topics-container")
|
|
.css('min-height','250px').css('min-width','420px')
|
|
.editableList({
|
|
addItem: function(container,i,opt) {
|
|
if (!opt.hasOwnProperty('topic')) {
|
|
opt.topic = "";
|
|
}
|
|
var row = $('<div/>').appendTo(container);
|
|
var valueField = $('<input/>',{
|
|
class:"node-input-topic-value",
|
|
type:"text",
|
|
style:"margin-left: 5px;"
|
|
}).appendTo(row)
|
|
.typedInput({default:'str', types:['str']});
|
|
valueField.typedInput('value', opt.topic);
|
|
valueField.typedInput('type', 'str');
|
|
valueField.attr('placeholder', topic_str);
|
|
resizeTopics(container);
|
|
},
|
|
resizeItem: resizeTopics,
|
|
sortable: true,
|
|
removable: true
|
|
});
|
|
|
|
$("#node-input-mode").change(function(e) {
|
|
var val = $(this).val();
|
|
$(".node-row-custom").toggle(val==='custom');
|
|
$(".node-row-merge").toggle(val==='merge');
|
|
$(".node-row-reduce").toggle(val==='reduce');
|
|
$(".form-tips-auto").toggle((val==='auto') || (val==='reduce'));
|
|
if (val === "auto") {
|
|
$("#node-input-accumulate").attr('checked', false);
|
|
}
|
|
else if (val === "merge") {
|
|
var topics = node.topics;
|
|
var container = $("#node-input-topics-container");
|
|
container.editableList('empty');
|
|
for (var i=0;i<topics.length;i++) {
|
|
var topic = topics[i];
|
|
container.editableList('addItem', topic);
|
|
}
|
|
}
|
|
else if (val === "reduce") {
|
|
var jsonata_or_empty = {
|
|
value: "jsonata",
|
|
label: "expression",
|
|
icon: "red/images/typedInput/expr.png",
|
|
validate: function(v) {
|
|
try{
|
|
if(v !== "") {
|
|
jsonata(v);
|
|
}
|
|
return true;
|
|
}
|
|
catch(e){
|
|
return false;
|
|
}
|
|
},
|
|
expand:function() {
|
|
var that = this;
|
|
RED.editor.editExpression({
|
|
value: this.value().replace(/\t/g,"\n"),
|
|
complete: function(v) {
|
|
that.value(v.replace(/\n/g,"\t"));
|
|
}
|
|
})
|
|
}
|
|
};
|
|
$("#node-input-reduceExp").typedInput({types:[jsonata_or_empty]});
|
|
$("#node-input-reduceInit").typedInput({
|
|
default: 'num',
|
|
types:['flow','global','str','num','bool','json','bin','date','jsonata'],
|
|
typeField: $("#node-input-reduceInitType")
|
|
});
|
|
$("#node-input-reduceFixup").typedInput({types:[jsonata_or_empty]});
|
|
}
|
|
});
|
|
|
|
$("#node-input-build").change(function(e) {
|
|
var val = $(this).val();
|
|
$(".node-row-key").toggle(val==='object');
|
|
$(".node-row-accumulate").toggle(val==='object' || val==='merged');
|
|
$(".node-row-joiner").toggle(val==='string' || val==='buffer');
|
|
$(".node-row-trigger").toggle(val!=='auto');
|
|
if (val === 'string' || val==='buffer') {
|
|
$("#node-input-property").typedInput('types',['msg']);
|
|
} else {
|
|
$("#node-input-property").typedInput('types',['msg', {value:"full",label:"complete message",hasValue:false}]);
|
|
}
|
|
});
|
|
|
|
$("#node-input-joiner").typedInput({
|
|
default: 'str',
|
|
typeField: $("#node-input-joinerType"),
|
|
types:[
|
|
'str',
|
|
'bin'
|
|
]
|
|
});
|
|
|
|
$("#node-input-property").typedInput({
|
|
typeField: $("#node-input-propertyType"),
|
|
types:['msg', {value:"full", label:"complete message", hasValue:false}]
|
|
});
|
|
|
|
$("#node-input-key").typedInput({
|
|
types:['msg', {value:"merge", label:"", hasValue:false}]
|
|
});
|
|
|
|
$("#node-input-build").change();
|
|
$("#node-input-mode").change();
|
|
},
|
|
oneditsave: function() {
|
|
var build = $("#node-input-build").val();
|
|
if (build !== 'object' && build !== 'merged') {
|
|
$("#node-input-accumulate").prop("checked",false);
|
|
}
|
|
var topics = $("#node-input-topics-container").editableList('items');
|
|
var node = this;
|
|
node.topics = [];
|
|
topics.each(function(i) {
|
|
var topicData = $(this).data('data');
|
|
var topic = $(this);
|
|
var vf = topic.find(".node-input-topic-value");
|
|
var value = vf.typedInput('value');
|
|
var r = {topic:value};
|
|
node.topics.push(r);
|
|
});
|
|
},
|
|
oneditresize: function(size) {
|
|
var rows = $("#dialog-form>div:not(.node-input-topics-container-row)");
|
|
var height = size.height;
|
|
for (var i=0;i<rows.size();i++) {
|
|
height -= $(rows[i]).outerHeight(true);
|
|
}
|
|
var editorRow = $("#dialog-form>div.node-input-topics-container-row");
|
|
height -= (parseInt(editorRow.css("marginTop"))+parseInt(editorRow.css("marginBottom")));
|
|
$("#node-input-topics-container").editableList('height',height);
|
|
}
|
|
});
|
|
</script>
|