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scxa-faceted-search-results-v5

v5.0.1

Published

Faceted experiments list for Single Cell Expression Atlas gene search results

Downloads

9

Readme

Faceted Search Results for Single Cell Expression Atlas

Build Status Coverage Status

A lightweight and extensible component to list and filter lists of search results. It receives a URL (as a combination of host and resource) to async-fetch the results, and a React component class to visualise each element (e.g. a card).

The facets are used to render a sidebar on the left as a set of filtering controls. Filter groups can be displayed either as searchable, multiselect dropdown lists or as checkboxes.

Two more optional props, namely noResultsMessageFormatter and resultsMessageFormatter, return a string which is displayed when there are no results, and as a header on top of the search results, respectively. In many occasions it is useful to display such messages using information returned by the server; that’s the reason why both functions take the JSON payload as an argument, allowing for some customisation in that regard. For example, if in the case of no results the server returns a field reason you could have something like this:

<ReactFacetedSearch
  ...
  noResultsMessageFormatter={(data) => `Your search yielded no results: ${data.reason}`}

Requirements

You should have at least Node 16 LTS with NPM 8 or later. You can check your current installed version executing this command.

npm --version
8.5.6

How to execute the unit tests with Cypress

We are using the Cypress framework for unit testing this package. You can execute the existing tests in the following way:

  1. Type npx cypress open in the terminal in the root folder of this package.
  2. In the appearing browser window you have to click on Component Testing, select a browser and click on Start Component Testing in <browser name>.
  3. In the appearing list just click on the test you would like to run and check the results on the screen.

Try out the component with a given example

Just run webpack-dev-server:

npx webpack serve --mode=development

How to run test with code coverage in the console

Run tests with:

npx cypress run --component

If you want to omit video recording:

npx cypress run --component --record false

Find coverage reports at: ./coverage/lcov-report/index.html

Add code coverage (in a nutshell)

This is an abridged version of https://docs.cypress.io/guides/tooling/code-coverage.

Add the following three packages:

npm install -D babel-plugin-transform-class-properties babel-plugin-istanbul @cypress/code-coverage

Add the two plugins to your .babelrc file:

{
  "presets": ["@babel/preset-react", "@babel/preset-env"],
  "plugins": [ "transform-class-properties", "istanbul" ]
}

Add @cypress/code-coverage in your cypress.config.js file so it looks like this:

const { defineConfig } = require(`cypress`)

module.exports = defineConfig({
  component: {
    setupNodeEvents(on, config) {
      require(`@cypress/code-coverage/task`)(on, config)
      // include any other plugin code...

      // It's IMPORTANT to return the config object
      // with any changed environment variables
      return config
    },
    devServer: {
      framework: `react`,
      bundler: `webpack`
    }
  }
})

Lastly, add the following import to cypress/support/component.js:

import '@cypress/code-coverage/support'

Combining with the EBI Visual Framework

React-Select allows you to style the div that encloses the input element, but not the input element itself. Therefore it’s convenient to add the snippet below to override the styling set by the EBI Visual Framework for input elements.

.input-clear input, .input-clear input:focus {
  height: unset;
  box-shadow: none;
  margin: 0;
}

At the time of writing this applies to the most recent version (v1.3). Wrapping these styles within the appropriate div selector is sufficient. See https://github.com/ebi-gene-expression-group/scxa-faceted-search-results/blob/master/html/filter-list.html for a working example.

A note about building with Webpack

The component uses async/await to fetch the JSON payload from the server. This requires to prefix the entry with @babel/polyfill. If you are already using an equivalent polyfill or Runtime transform you may skip this.