mirror of
https://github.com/danog/react-datalist-input.git
synced 2024-12-12 09:29:56 +01:00
150 lines
5.4 KiB
Markdown
150 lines
5.4 KiB
Markdown
## Info
|
|
|
|
This package provides a single react component.
|
|
|
|
The component contains an input field with a drop down menu to pick a possible option based on the current input as a react component.
|
|
|
|
Following features describe and might distinguish the component from other npm packages that offer a similar react component:
|
|
<br>
|
|
- Hand over an array of options (items) with label and key properties
|
|
- Feel free to add additional properties to access those on selection within your callback function
|
|
- On selection the selected item will be passed to the callback function
|
|
- Define your own matching algorithm to restrict which options should be shown in the drop down menu based on the current user input
|
|
- Or do not pass an own matching algorithm and just use the default match function
|
|
- The current user input will be highlighted (bold) within each label in the drop down menu
|
|
- The callback function will be triggered only if the key property has changed since the last selection
|
|
- Selecting the same item twice in a row will trigger the callback function only once (on the first selection)
|
|
|
|
Have a look at [w3schools.com](https://www.w3schools.com/howto/howto_js_autocomplete.asp) to see how you can do the same thing with pure html, css, and js.
|
|
|
|
For more information about react and the ecosystem see this [guide](https://github.com/facebookincubator/create-react-app/blob/master/packages/react-scripts/template/README.md).
|
|
|
|
## Check it out yourself
|
|
|
|
Have a look at this [demo app](https://stark-retreat-79786.herokuapp.com/) using the react-datalist-input component.
|
|
<br>The app is running on heroku for free, so I hope it is still up.
|
|
|
|
## Feedback
|
|
Feel free to get inspired and more importantly please provide [your feedback](https://github.com/andrelandgraf/react-datalist-input/issues) on structure and style. I'm more than happy to learn how to improve my code and architecture.
|
|
|
|
## Installation
|
|
|
|
**Installation via npm**
|
|
|
|
```
|
|
npm install react-datalist-input --save
|
|
```
|
|
|
|
***Basic Usage***
|
|
|
|
```
|
|
import DataListInput from 'react-datalist-input';
|
|
|
|
/**
|
|
* create your own match algorithm if you want to do so
|
|
* @param currentInput String (the current user input)
|
|
* @param item (one item of the items array)
|
|
* @returns {boolean}
|
|
*/
|
|
matchCurrentInput = (currentInput, item) => {
|
|
const yourLogic = item.someAdditionalValue;
|
|
return (yourLogic.substr(0, currentInput.length).toUpperCase() === currentInput.toUpperCase());
|
|
};
|
|
|
|
/**
|
|
* your callback function gets called if the user selects one option out of the drop down menu
|
|
* @param selectedItem object (the selected item / option)
|
|
* @returns {*}
|
|
*/
|
|
onSelect = (selectedItem) => {
|
|
this.doSomething(selectedItem);
|
|
};
|
|
|
|
render() {
|
|
// the array you want to pass to the react-data-list component
|
|
// each element at least needs a key and a label
|
|
const items = this.props.values.map((item, i) => {
|
|
return {
|
|
// what to show to the user
|
|
label: item.id + ": " + item.name,
|
|
// key to identify the item within the array
|
|
key: item.id,
|
|
// feel free to add your own app logic to access those properties later on
|
|
someAdditionalValue: item.someAdditionalValue,
|
|
}
|
|
});
|
|
|
|
return(
|
|
<div>
|
|
<DataListInput placeholder={"Select an option from the drop down menu..."}
|
|
items={items} onSelect={this.onSelect} match={this.matchCurrentInput}/>
|
|
</div>
|
|
);
|
|
```
|
|
|
|
## Properties
|
|
|
|
***items***
|
|
|
|
- <b>Required</b> property!
|
|
- The array of options for the drop down menu.<br>
|
|
- Every item inside the array needs to have following properties:
|
|
- key : an id that identifies the item within the array
|
|
- label: the label that will be shown in the drop down menu
|
|
|
|
***onSelect***
|
|
|
|
- <b>Required</b> property!
|
|
- The callback function that will be called if the user selects one item of the drop down menu.
|
|
- Gets only called if the item changes. Selecting the same item twice will only trigger the function once (the first time).
|
|
- Parameter: (selectedKey)
|
|
- selectedKey: the Key Property of the item that the user selected
|
|
|
|
***match***
|
|
|
|
- Pass a match function as stated above for creating your own matching algorithm for the autocomplete functionality.
|
|
- Parameter: (currentInput, item)
|
|
- currentInput: String, the current user input typed into the input field
|
|
- item: Object, the item of the items array (with key and label properties)
|
|
|
|
- Default:
|
|
```
|
|
/**
|
|
* default function for matching the current input value (needle) and the values of the items array
|
|
* @param currentInput String (the current user input)
|
|
* @param item (one item of the items array)
|
|
* @returns {boolean}
|
|
*/
|
|
match = (currentInput, item) => {
|
|
return item.label.substr(0, currentInput.length).toUpperCase() === currentInput.toUpperCase();
|
|
};
|
|
```
|
|
|
|
***placeholder***
|
|
|
|
- The placeholder that will be shown inside the input field.
|
|
- Default is an empty string
|
|
|
|
***itemClassName***
|
|
|
|
- Additional classes to style each input field in the dropdown menu.
|
|
- Default is an empty string
|
|
|
|
***activeItemClassName***
|
|
|
|
- Additional classes to style the active input field.
|
|
- Default is an empty string
|
|
|
|
***inputClassName***
|
|
|
|
- Additional classes to style the input field.
|
|
- Default is an empty string
|
|
|
|
***requiredInputLength***
|
|
|
|
- Number to specify the threshold until when the dropdown menu should appear.
|
|
- Example `requiredInputLength=3`, only if the user input is longer than 2 characters, the dropdown menu will appear.
|
|
- Default is zero.
|
|
|
|
|