Custom Vue Basic String Renderer for JSONForms

I'm delving into Vue JSONForms and attempting to develop a basic custom text renderer from scratch. While I am aware of the vue-vanilla package available in JSONForms, I want to grasp the fundamental requirements for creating a custom renderer as I anticipate needing to customize each one extensively in the future. Here's what my initial attempt looks like:

<template>
    <v-input />
</template>

<script lang="ts">
import { ControlElement, JsonFormsRendererRegistryEntry, rankWith, isStringControl } from '@jsonforms/core'
import { useJsonFormsControl, RendererProps } from '@jsonforms/vue'
import { defineComponent } from 'vue'

const renderersText = defineComponent({
    name: 'renderers-text',
    setup (props: RendererProps<ControlElement>) {
        return useJsonFormsControl(props)
    },
})

export default renderersText

export const entry: JsonFormsRendererRegistryEntry = {
    renderer: renderersText,
    tester: rankWith(1, isStringControl),
}
</script>

However, I'm encountering a r.tester is not a function error. Any insights on what this signifies or how I can resolve it? Your assistance is greatly appreciated!

Answer №1

When using the jsonforms vue template, you can include renderers by following this pattern

const renderers = Object.freeze([
    ...vanillaRenderers,
    // add any custom renderers here
])

The vanillaRenderers collection (defined as any[]) is essentially a group of JsonFormsRendererRegistryEntry objects. One common mistake leads to the error message r.tester is not a function, which occurs when adding a renderer object to the collection like this:

const renderers = Object.freeze([
    ...vanillaRenderers,
    renderersText,
])

To avoid this issue, be sure to include a proper JsonFormsRendererRegistryEntry object, as shown in this example

const renderers = [
  ...vanillaRenderers,
  {
    tester: rankWith(
      1,
      isStringControl,
    ),
    renderer: renderersText,
  }
];

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