weight tracker

Script API.md

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+For [[Scripts]] to do anything useful, Trilium publishes "Script API". Actually there are two such APIs:
+
+* [Frontend API](https://zadam.github.io/trilium/frontend_api/FrontendScriptApi.html)
+* [Backend API](https://zadam.github.io/trilium/backend_api/BackendScriptApi.html)

Scripts.md

@@ -67,7 +67,4 @@ Other events are bound to some entity, these are defined as [[relations|Attribut
 
 ## Script API
 
-To do anything useful, Trilium publishes "Script API". Actually there are two such APIs:
+See [[Script API]].
-
-* [Frontend API](https://zadam.github.io/trilium/frontend_api/)
-* [Backend API](https://zadam.github.io/trilium/backend_api/)

Task manager.md

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+Weight Tracker is a [[Script API]] showcase present in the [[demo document|Document#demo-document]].
+
+[[Day notes]] shows (among others) how we have "weight" [[promoted attribute|promoted attributes]] in the day note [[template]]. This then aggregates the data and shows a nice graph of weight change in time.
+
+## Demo
+[[images/weight-tracker.png]]
+
+## Implementation
+
+Note "Weight Tracker" in the screenshot above is of type "Render HTML note". Such note doesn't have any useful content itself, the only purpose of it is to provide a place where some [[script|scripts]] can render some output. This script is defined in [[relation|attributes]] `renderNote` - coincidentally it's the Weight Tracker's child `Implementation`.
+
+This Implementation code note then contains some HTML and JavaScript which loads all the notes with "weight" attribute and displays them in a graph. To actually render graph we're using third party library [chart.js](https://www.chartjs.org/) which is imported as an attachment (it's not built-in into Trilium).
+
+### JS code
+To get an idea of the script, here's the "JS code" note content:
+
+```$javascript
+async function getChartData() {
+    const days = await api.runOnServer(async () => {
+        const notes = await api.getNotesWithLabel('weight');
+        const days = [];
+
+        for (const note of notes) {
+            const date = await note.getLabelValue('dateNote');
+            const weight = parseFloat(await note.getLabelValue('weight'));
+
+            if (date && weight) {
+                days.push({ date, weight });
+            }
+        }
+
+        days.sort((a, b) => a.date > b.date ? 1 : -1);
+
+        return days;
+    });
+
+    const datasets = [
+        {
+            label: "Weight (kg)",
+            backgroundColor: 'red',
+            borderColor: 'red',
+            data: days.map(day => day.weight),
+            fill: false,
+            spanGaps: true,
+            datalabels: {
+                display: false
+            }
+        }
+    ];
+
+    return {
+        datasets: datasets,
+        labels: days.map(day => day.date)
+    };
+}
+
+const ctx = $("#canvas")[0].getContext("2d");
+
+new chartjs.Chart(ctx, {
+    type: 'line',
+    data: await getChartData()
+});
+```

Weight tracker.md

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+
+
+## Demo
+