react-highlightable-input
v1.1.7
Published
A custom react input component that allows highlighting or styling of specific text as it is typed. For example, you can highlight mentions starting with @ symbol in a text input as the user types them.
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react-highlightable-input
A custom react input component that allows highlighting or styling of specific text as it is typed. For example, you can highlight mentions starting with @ symbol in a text input as the user types them.
Install
npm install react-highlightable-input
Usage
import {
HighlightableTextInput,
highlightMentions,
cleanHtml,
} from "react-highlightable-input";
import { useRef, useState } from "react";
import "./App.css";
function App() {
const inputRef = useRef<HTMLDivElement>(null);
const shadowRef = useRef<HTMLDivElement>(null);
const [highlightedContent, setHiglightedContent] = useState<string>("");
const onInput = () => {
if (inputRef.current) {
const value = inputRef.current.innerHTML;
const highlighted = highlightMentions(value, /@[\w]+/g, "#1d9bf0");
setHiglightedContent(highlighted);
}
};
const onSend = () => {
console.log("Send message:", cleanHtml(highlightedContent));
};
return (
<div>
<div
style={{
border: "1px solid black",
padding: "5px",
}}>
<HighlightableTextInput
inputRef={inputRef}
shadowRef={shadowRef}
highlightedContent={highlightedContent}
setHiglightedContent={setHiglightedContent}
onInput={onInput}
placeholderText="Highlight mentions with @ symbol"
/>
</div>
<button
onClick={onSend}
style={{
backgroundColor: "#4caf50",
color: "white",
padding: "5px 10px",
border: "none",
cursor: "pointer",
alignSelf: "flex-start",
marginTop: "10px",
}}>
Send
</button>
</div>
);
}
export default App;
A closer look at the HighlightableTextInput
component
<HighlightableTextInput
inputRef={inputRef} // Ref to the input element
shadowRef={shadowRef} // Ref to the shadow element
highlightedContent={highlightedContent} // The content to be highlighted
setHiglightedContent={setHiglightedContent} // Function to set the highlighted content
onInput={onInput} // Function to be called when the input changes
/>
Props
| Prop Name | Type | Description |
| ---------------------- | -------------------------------------------------- | -------------------------------------------- |
| inputRef
| React.RefObject<HTMLDivElement>
| A reference to the input element. |
| shadowRef
| React.RefObject<HTMLDivElement>
| A reference to the shadow element. |
| highlightedContent
| string
| The content that should be highlighted. |
| placeholderText
| string
(optional) | The placeholder text for the input element. |
| onInput
| (event: React.FormEvent<HTMLDivElement>) => void
| The event handler for the input event. |
| setHiglightedContent
| (highlighted: string) => void
| The function to set the highlighted content. |
| style
| React.CSSProperties
(optional) | The CSS styles for the input element. |
export interface HighlightableTextInputProps {
inputRef: React.RefObject<HTMLDivElement>;
shadowRef: React.RefObject<HTMLDivElement>;
highlightedContent: string;
placeholderText?: string;
onInput: (event: React.FormEvent<HTMLDivElement>) => void;
setHiglightedContent: (highlighted: string) => void;
style?: React.CSSProperties;
}
Highlight Functions
highlightMentions
function highlightMentions(
text: string,
mentionPattern: RegExp,
highlightColor: string
): string;
This function takes a string of text, a regular expression pattern to match mentions, and a color to highlight the mentions. It returns a new string where the mentions are wrapped in a span
tag with the specified color.
Parameters:
text
: The input text.mentionPattern
: The regular expression pattern to match mentions.highlightColor
: The color to highlight the mentions.
Returns:
A new string where the mentions are highlighted with the specified color.
highlightText
function highlightText(
text: string,
pattern: RegExp,
style: React.CSSProperties
): string;
This function takes a string of text, a regular expression pattern to match mentions, and a style object to style the mentions. It returns a new string where the mentions are wrapped in a span
tag with the specified styles.
Parameters:
text
: The input text.mentionPattern
: The regular expression pattern to match mentions.style
: The style object to style the mentions. This should be aReact.CSSProperties
object.
Returns:
A new string where the mentions are styled with the specified styles.
Utility Functions
cleanHtml
function cleanHtml(html: string): string
Parameters:
html
: The input HTML string.
Returns:
A new string where all HTML tags are removed, <div>
tags are replaced with newlines, and <
and >
entities are replaced with <
and >
characters, respectively.
Usage Instructions for the HighlightableTextInput component
1. Setting border and padding
If you want to add the border to the react-highlightable-input
then wrap the HighlightableTextInput
component with a div
and add the border to the div
element. Same goes for other styles like padding margin. Otherwise some unexpected styling issues may occur.
<div style={{ border: "1px solid black", padding: "5px" }}>
<HighlightableTextInput
inputRef={inputRef}
shadowRef={shadowRef}
highlightedContent={highlightedContent}
setHiglightedContent={setHiglightedContent}
onInput={onInput}
/>
</div>
2. Setting height and width
Width and height of the input div can be set in two ways
1. Via style
props
<div style={{ border: "1px solid black", padding: "5px" }}>
<HighlightableTextInput
inputRef={inputRef}
shadowRef={shadowRef}
highlightedContent={highlightedContent}
setHiglightedContent={setHiglightedContent}
onInput={onInput}
style={{
width: "500px",
height: "300px",
}}
/>
</div>
2. Via HighlightableTextInput div id (highlightableTextInput-container
)
#highlightableTextInput-container {
width: 500px;
height: 300px;
}
<div style={{ border: "1px solid black", padding: "5px", display: "inline-block" }}>
<HighlightableTextInput
inputRef={inputRef}
shadowRef={shadowRef}
highlightedContent={highlightedContent}
setHiglightedContent={setHiglightedContent}
onInput={onInput}
</div>
Note: The display: inline-block
is used to make the div element take the width and height of the child element.