redux-devtools/packages/d3tooltip/README.md
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# d3tooltip
This tooltip aims for a minimal yet highly configurable API. It has a long way to go, but the essentials are there.
It was created by [@romseguy](https://github.com/romseguy) and merged from [`romseguy/d3tooltip`](https://github.com/romseguy/d3tooltip).
## Installation
`npm install d3-state-visualizer`
## Quick usage
```javascript
import * as d3 from 'd3';
import { tooltip } from 'd3tooltip';
const DOMNode = document.getElementById('chart');
const root = d3.select(DOMNode);
const vis = root.append('svg');
const options = {
offset: { left: 30, top: 10 },
styles: { 'min-width': '50px', 'border-radius': '5px' },
};
vis
.selectAll('circle')
.data(someData)
.enter()
.append('circle')
.attr('r', 10)
.call(
d3tooltip('tooltipClassName', {
...options,
text: (d) => toStringOrHtml(d),
})
)
.on('mouseover', function () {
d3.select(this).style('fill', 'skyblue');
})
.on('mouseout', function () {
d3.select(this).style('fill', 'black');
});
```
## API
| Option | Type | Default | Description |
| -------- | ------------------ | ------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `root` | DOM.Element | `body` | The tooltip will be added as a child of that element. You can also use a D3 [selection](https://github.com/mbostock/d3/wiki/Selections#d3_select). |
| `left` | Number | `undefined` | Sets the tooltip `x` absolute position instead of the mouse `x` position, relative to the `root` element. |
| `top` | Number | `undefined` | Sets the tooltip `y` absolute position instead of the mouse `y` position, relative to the `root` element. |
| `offset` | Object | `{left: 0, top: 0}` | Sets the distance, starting from the cursor position, until the tooltip is rendered. **Warning**: only applicable if you don't provide a `left` or `top` option. |
| `styles` | Object | `{}` | Sets the styles of the tooltip element. |
| `text` | String or Function | `''` | Sets the text of the tooltip. Can be a constant `string` or a function that takes the datum and returns a `string`. |