Table supports single object along with array of objects

docs/nodes/widgets/ui-table.md

@@ -37,6 +37,8 @@ dynamic:
 
 </TryDemo>
 
+## Sending Data
+
 Renders a set of data in a tabular format. Expects an input (`msg.payload`) in the format of:
 
 ```json
@@ -53,6 +55,24 @@ Renders a set of data in a tabular format. Expects an input (`msg.payload`) in t
 
 The table will be rendered with colums `colA`, `colB` and `colC`, unless "Columns" are explicitely defined on the node, with "Auto Columns" toggled off.
 
+You can also send a single piece of data to append to the existing table, in this case, the `ui-table` expects an input (`msg.payload`) in the format of:
+
+```json
+{
+    "colA": "A",
+    "colB": "Hello",
+    "colC": 3
+}
+```
+
+### Clear Data
+
+You can send an empty array to clear the table.
+
+```json
+[]
+```
+
 ## Properties
 
 <PropsTable/>

nodes/widgets/locales/en-US/ui_table.html

@@ -4,9 +4,9 @@
     </p>
     <h3>Input</h3>
     <p>
-        The ui-table widget requires an array of data to be sent via <code>msg.payload</code>.
-        The table will then render a row for each object within the array, and, by default, a
-        column for each property in the objects.
+        The ui-table widget requires an array or an object of data to be sent via <code>msg.payload</code>.
+        If an array is provided, the table will render a row for each object within the array, and, by default, a column for each property in the objects.
+        If an object is provided, the table will render a single row with columns for each property in the object.
     </p>
     <h3>Properties</h3>
     <dl class="message-properties">
@@ -15,6 +15,11 @@ <h3>Properties</h3>
             Defines the maximum number of data-rows to render in the table.
             Excess rows will be available through pagination control. Set to "0" for no pagination.
         </dd>
+        <dt>Action <span class="property-type">append | replace</span></dt>
+        <dd>
+            Determines the action taken when new data arrives, and whether the new data is appended
+            to the chart, or replaces the existing contents.
+        </dd>
         <dt>Breakpoint <span class="property-type">str | num</span></dt>
         <dd>
             Controls when a table will render, instead, as a card, with each column from a row rendering

nodes/widgets/locales/en-US/ui_table.json

@@ -18,7 +18,10 @@
             "selection": "Interaction",
             "search": "Search",
             "showSearch": "Show",
-            "mobileBreakpoint": "Breakpoint"
+            "mobileBreakpoint": "Breakpoint",
+            "action": "Action",
+            "append": "Append",
+            "replace": "Replace"
         },
         "selection": {
             "none": "None",

nodes/widgets/ui_table.html

@@ -86,7 +86,8 @@
                     value: null
                 },
                 mobileBreakpoint: { value: 'sm' },
-                mobileBreakpointType: { value: 'defaults' }
+                mobileBreakpointType: { value: 'defaults' },
+                action: { value: 'append' }
             },
             inputs: 1,
             outputs: 1,
@@ -102,6 +103,10 @@
                 if (!validSelectionTypes.includes(this.selectionType)) {
                     $('#node-input-selectionType').val('none')
                 }
+                const validActionTypes = ['append', 'replace']
+                if (!validActionTypes.includes(this.action)) {
+                    $('#node-input-action').val('append')
+                }
                 // if this groups parent is a subflow template, set the node-config-input-width and node-config-input-height up
                 // as typedInputs and hide the elementSizer (as it doesn't make sense for subflow templates)
                 if (RED.nodes.subflow(this.z)) {
@@ -315,6 +320,13 @@
         <label for="node-input-maxrows"><i class="fa fa-tag"></i> <span data-i18n="ui-table.label.maxRows"></label>
         <input type="number" id="node-input-maxrows">
     </div>
+    <div class="form-row">
+        <label for="node-input-action" data-i18n="ui-table.label.action"></label></label>
+        <select id="node-input-action">
+            <option value="append" data-i18n="ui-table.label.append"></option>
+            <option value="replace" data-i18n="ui-table.label.replace"></option>
+        </select>
+    </div>
     <div class="form-row">
         <label for="node-input-mobileBreakpoint"><i class="fa fa-mobile"></i> <span data-i18n="ui-table.label.mobileBreakpoint"></label>
         <input type="text" id="node-input-mobileBreakpoint">

nodes/widgets/ui_table.js

@@ -9,6 +9,7 @@ module.exports = function (RED) {
 
         // which group are we rendering this widget
         const group = RED.nodes.getNode(config.group)
+        const base = group.getBase() // Used for datastore
 
         config.maxrows = parseInt(config.maxrows) || 0
 
@@ -29,9 +30,26 @@ module.exports = function (RED) {
         group.register(node, config, {
             onAction: true,
             onInput: function (msg) {
-                // store the latest msg passed to node
-                datastore.save(group.getBase(), node, msg)
-                // do nothing else - do not pass the message on
+                const existingData = datastore.get(node.id) || []
+                const formatPayload = (value) => {
+                    if (value !== null && typeof value !== 'undefined') {
+                        // push object into array if user sends object instead of array
+                        if (typeof value === 'object' && !Array.isArray(value)) {
+                            return [value]
+                        }
+                    }
+                    return value
+                }
+                let payload = formatPayload(msg?.payload)
+                // check if the action is to append records
+                if (config.action === 'append') {
+                    payload = payload && payload.length > 0 ? [...existingData.payload || [], ...payload || []] : payload
+                }
+
+                datastore.save(base, node, {
+                    ...msg,
+                    payload
+                })
             }
         })
     }

ui/src/widgets/ui-table/UITable.vue

@@ -14,7 +14,7 @@
         class="nrdb-table"
         :mobile="isMobile"
         :class="{'nrdb-table--mobile': isMobile}"
-        :items="messages[id]?.payload" :return-object="true"
+        :items="payload || []" :return-object="true"
         :items-per-page="itemsPerPage"
         :headers="headers" :show-select="props.selectionType === 'checkbox'"
         :search="search"
@@ -69,17 +69,18 @@ export default {
                 page: 1,
                 pages: 0,
                 rows: []
-            }
+            },
+            localData: []
         }
     },
     computed: {
         ...mapState('data', ['messages']),
         headers () {
             if (this.props.autocols) {
-                if (this.messages[this.id]?.payload) {
+                if (this.localData?.length) {
                     // loop over data and get keys
                     const cols = []
-                    for (const row of this.messages[this.id].payload) {
+                    for (const row of this.localData) {
                         Object.keys(row).forEach((key) => {
                             if (!cols.includes(key)) {
                                 cols.push(key)
@@ -90,9 +91,7 @@ export default {
                         return { key: col, title: col }
                     })
                 } else {
-                    return [{
-                        key: '', title: ''
-                    }]
+                    return []
                 }
             } else if (this.props.columns) {
                 return this.props.columns.map((col) => {
@@ -112,12 +111,7 @@ export default {
             }
         },
         rows () {
-            // store full set of data rows
-            if (this.messages[this.id]?.payload) {
-                return this.messages[this.id].payload
-            } else {
-                return undefined
-            }
+            return this.localData
         },
         itemsPerPage () {
             return this.props.maxrows || 0
@@ -127,6 +121,13 @@ export default {
                 typeMap[col.key] = col.type
                 return typeMap
             }, {})
+        },
+        payload () {
+            const value = this.messages[this.id]?.payload
+            return this.formatPayload(value) || []
+        },
+        isAppend () {
+            return this.props.action === 'append'
         }
     },
     watch: {
@@ -147,25 +148,53 @@ export default {
         }
     },
     created () {
-        this.$dataTracker(this.id)
+        this.$dataTracker(this.id, this.onMsgInput, this.onLoad)
     },
     mounted () {
-        this.calculatePaginatedRows()
         this.updateIsMobile()
         window.addEventListener('resize', this.updateIsMobile)
     },
     methods: {
+        formatPayload (value) {
+            if (value !== null && typeof value !== 'undefined') {
+                if (typeof value === 'object' && !Array.isArray(value)) {
+                    return [value]
+                }
+            }
+            return value
+        },
+        onMsgInput (msg) {
+            const value = this.formatPayload(msg?.payload)
+            if (this.props.action === 'append') {
+                this.localData = value && value?.length > 0 ? [...this.localData || [], ...value] : value
+            } else {
+                this.localData = value
+            }
+
+            this.$store.commit('data/bind', {
+                action: this.props.action,
+                widgetId: this.id,
+                msg: {
+                    payload: this.localData
+                }
+            })
+            this.calculatePaginatedRows()
+        },
+        onLoad (history) {
+            this.localData = []
+            this.onMsgInput(history)
+        },
         calculatePaginatedRows () {
-            if (this.props.maxrows > 0) {
-                this.pagination.pages = Math.ceil(this.rows?.length / this.props.maxrows)
-                this.pagination.rows = this.rows?.slice(
+            if (this.itemsPerPage > 0) {
+                this.pagination.pages = Math.ceil(this.localData?.length / this.props.maxrows)
+                this.pagination.rows = this.localData.slice(
                     (this.pagination.page - 1) * this.props.maxrows,
                     (this.pagination.page) * this.props.maxrows
                 )
             } else {
                 this.pagination.page = 1
                 this.pagination.pages = 0
-                this.pagination.rows = this.rows
+                this.pagination.rows = this.localData
             }
         },
         onRowClick (row) {