I’m trying to create a widget which shows a chart with a line for each item in a group. Unfortunately the chart is always empty. This is the code:
uid: widget_groupchart
tags: []
props:
parameters:
- description: Widget titel
label: title
name: title
required: false
type: TEXT
- context: item
description: An item to control
label: Item
name: item
required: false
type: TEXT
parameterGroups: []
timestamp: Feb 1, 2022, 9:51:05 PM
component: oh-chart
config:
label: =props.title
period: D
slots:
grid:
- component: oh-chart-grid
config: {}
xAxis:
- component: oh-time-axis
config:
gridIndex: 0
yAxis:
- component: oh-value-axis
config:
gridIndex: 0
scale: true
series:
- component: oh-repeater
config:
for: item
sourceType: itemsInGroup
groupItem: =props.item
slots:
default:
- component: oh-time-series
config:
name: =loop.item.label
gridIndex: 0
xAxisIndex: 0
yAxisIndex: 0
type: line
service: jdbc
item: =loop.item.name
The chart is working with one item (without oh-repeater) and the oh-repeater is working with oh-list-card but combining oh-repeater with oh-chart does not work.
I’m far from an expert but I don’t think this will work. The oh-repeater inserts widgets into the default slot but you need to work with the series slot of the chart widget based on what I see when I generate a chart and look at the YAML.
Interesting, I don’t think I’ve seen anyone attempt this yet. I am also skeptical that it will work, the chart family of components are just defined so differently from the others. I can’t test at the moment, but the one thing I would try first would be to add
fragment: true
to the repeater’s config. This will strip away an intervening tag that the repeater wraps around its children by default and may allow the replicated series component to be property visible to the axis component (low odds).
The fragment: true did not help.
I don’t understand the comment about the default slot. If I put the oh-repeater in the series slot, why should the oh-repeater put something in the default slot? But then I haven’t really understood how the oh-repeater really works. Is there a in depth documentation somewhere?
I think that’s just ambiguous language. I think that’s supposed to be: “repeat the children components in the oh-repeaters default slot, placing those components in the slot the oh-repeater is in.”
Is there any way to debug widget? Somehow see what is made out of the YAML to check what the oh-repeater does? Or do we need a developer to answer that question?
You can always see the resultant widget construction by using the ‘inspect’ feature of your web browser.
What’s at issue here, though is that the chart is not like the other standard widgets. The apache echarts library doesn’t build the entire chart out of standard elements, it creates a single canvas element and then draws the entire chart using the canvas. So, the chart components in OH are not processed the way the standard components are; the chart properties are all passed directly to echart library. Some conversion could almost certainly be done (I have no idea whether this is simple or extremely difficult) so that something like an oh-repeater could also be parsed into the echarts input, but it just hasn’t been done yet it seems.
I tried find solution like group.members[index], but it seems to don’t provide data.
Isn’t possible to create rule, who push data etc. after click on button?
