truncate-html
v1.1.2
Published
Truncate HTML and Keep Tags
Downloads
240,466
Readme
Notice This is a node module depends on cheerio can only run on nodejs. If you need a browser version, you may consider truncate or nodejs-html-truncate.
const truncate = require('truncate-html')
truncate('<p><img src="xxx.jpg">Hello from earth!</p>', 2, { byWords: true })
// => <p><img src="xxx.jpg">Hello from ...</p>
Installation
npm install truncate-html
or
yarn add truncate-html
Try it online
Click https://npm.runkit.com/truncate-html to try.
API
/**
* custom node strategy, default to Cheerio<AnyNode>
* * 'remove' to remove the node
* * 'keep' to keep the node(and anything inside it) anyway
* * Cheerio<AnyNode> truncate the returned node
* * undefined or any falsy value to truncate original node
*/
type ICustomNodeStrategy = (node: Cheerio<AnyNode>) => 'remove' | 'keep' | Cheerio<AnyNode> | undefined
/**
* truncate-html full options object
*/
interface IFullOptions {
/**
* remove all tags, default false
*/
stripTags: boolean
/**
* ellipsis sign, default '...'
*/
ellipsis: string
/**
* decode html entities(e.g. convert `&` to `&`) before counting length, default false
*/
decodeEntities: boolean
/**
* elements' selector you want ignore
*/
excludes: string | string[]
/**
* custom node strategy, default to Cheerio<AnyNode>
* * 'remove' to remove the node
* * 'keep' to keep the node(and anything inside it) anyway
* * Cheerio<AnyNode> truncate the returned node
* * undefined or any falsy value to truncate original node
*/
customNodeStrategy: ICustomNodeStrategy
/**
* how many letters(words if `byWords` is true) you want reserve
*/
length: number
/**
* if true, length means how many words to reserve
*/
byWords: boolean
/**
* how to deal with when truncate in the middle of a word
* 1. by default, just cut at that position.
* 2. set it to true, with max exceed 10 letters can exceed to reserver the last word
* 3. set it to a positive number decide how many letters can exceed to reserve the last word
* 4. set it to negative number to remove the last word if cut in the middle.
*/
reserveLastWord: boolean | number
/**
* if reserveLastWord set to negative number, and there is only one word in the html string, when trimTheOnlyWord set to true, the extra letters will be sliced if word's length longer than `length`.
* see issue #23 for more details
*/
trimTheOnlyWord: boolean
/**
* keep whitespaces, by default continuous paces will
* be replaced with one space, set it true to keep them
*/
keepWhitespaces: boolean
}
/**
* options interface for function
*/
type IOptions = Partial<IFullOptions>
function truncate(html: string | CheerioAPI, length?: number | IOptions, truncateOptions?: IOptions): string
// and truncate.setup to change default options
truncate.setup(options: IOptions): void
Default options
{
stripTags: false,
ellipsis: '...',
decodeEntities: false,
excludes: '',
byWords: false,
reserveLastWord: false,
trimTheOnlyWord: false,
keepWhitespaces: false
}
You can change default options by using truncate.setup
e.g.
truncate.setup({ stripTags: true, length: 10 })
truncate('<p><img src="xxx.jpg">Hello from earth!</p>')
// => Hello from
or use existing cheerio instance
import * as cheerio from 'cheerio'
truncate.setup({ stripTags: true, length: 10 })
// truncate option `decodeEntities` will not work
// you should config it in cheerio options by yourself
const $ = cheerio.load('<p><img src="xxx.jpg">Hello from earth!</p>', {
/** set decodeEntities if you need it */
decodeEntities: true
/* any cheerio instance options*/
}, false) // third parameter is for `isDocument` option, set to false to get rid of extra wrappers, see cheerio's doc for details
truncate($)
// => Hello from
Notice
Typescript support
This lib is written with typescript and has a type definition file along with it. ~~You may need to update your tsconfig.json
by adding "esModuleInterop": true
to the compilerOptions
if you encounter some typing errors, see #19.~~
import truncate, { type IOptions } from 'truncate-html'
const html = '<p><img src="abc.png"><i>italic<b>bold</b></i>This is a string</p> for test.'
const options: IOptions = {
length: 10,
byWords: true
}
truncate(html, options)
// => <p><img src="abc.png"><i>italic<b>bold...</b></i></p>
custom node truncate strategy
In complex html string, you may want to keep some special elements and truncate the others. You can use customNodeStrategy
to achieve this:
- return
'remove'
to remove the node 'keep'
to keep the node(and anything inside it) anywayCheerio<AnyNode>
to truncate the returned node, or any falsy value to truncate the original node.
import truncate, { type IOptions, type ICustomNodeStrategy } from 'truncate-html'
// argument node is a cheerio instance
const customNodeStrategy: ICustomNodeStrategy = node => {
// remove img tag
if (node.is('img')) {
return 'remove'
}
// keep italic tag and its children
if (node.is('i')) {
return 'keep'
}
// truncate summary tag that inside details tag instead of details tag
if (node.is('details')) {
return node.find('summary')
}
}
const html = '<div><img src="abc.png"><i>italic<b>bold</b></i><details><summary>Click me</summary><p>Some details</p></details>This is a string</div> for test.'
const options: IOptions = {
length: 10,
customNodeStrategy
}
truncate(html, options)
// => <div><i>italic<b>bold</b></i><details><summary>Click me</summary><p>Some details</p></details>Th...</div>
About final string length
If the html string content's length is shorter than options.length
, then no ellipsis will be appended to the final html string. If longer, then the final string length will be options.length
+ options.ellipsis
. And if you set reserveLastWord
to true or none zero number, the final string will be various.
About html comments
All html comments <!-- xxx -->
will be removed
About dealing with none alphabetic languages
When dealing with none alphabetic languages, such as Chinese/Japanese/Korean, they don't separate words with whitespaces, so options byWords
and reserveLastWord
should only works well with alphabetic languages.
And the only dependency of this project cheerio
has an issue when dealing with none alphabetic languages, see Known Issues for details.
Using existing cheerio instance
If you want to use existing cheerio instance, truncate option decodeEntities
will not work, you should set it in your own cheerio instance:
var html = '<p><img src="abc.png">This is a string</p> for test.'
const $ = cheerio.load(`${html}`, {
decodeEntities: true
/** other cheerio options */
}, false) // third parameter is for `isDocument` option, set to false to get rid of extra wrappers, see cheerio's doc for details
truncate($, 10)
Examples
var truncate = require('truncate-html')
// truncate html
var html = '<p><img src="abc.png">This is a string</p> for test.'
truncate(html, 10)
// returns: <p><img src="abc.png">This is a ...</p>
// truncate string with emojis
var string = '<p>poo 💩💩💩💩💩<p>'
truncate(string, 6)
// returns: <p>poo 💩💩...</p>
// with options, remove all tags
var html = '<p><img src="abc.png">This is a string</p> for test.'
truncate(html, 10, { stripTags: true })
// returns: This is a ...
// with options, truncate by words.
// if you try to truncate none alphabet language(like CJK)
// it will not act as you wish
var html = '<p><img src="abc.png">This is a string</p> for test.'
truncate(html, 3, { byWords: true })
// returns: <p><img src="abc.png">This is a ...</p>
// with options, keep whitespaces
var html = '<p> <img src="abc.png">This is a string</p> for test.'
truncate(html, 10, { keepWhitespaces: true })
// returns: <p> <img src="abc.png">This is a ...</p>
// combine length and options
var html = '<p><img src="abc.png">This is a string</p> for test.'
truncate(html, {
length: 10,
stripTags: true
})
// returns: This is a ...
// custom ellipsis sign
var html = '<p><img src="abc.png">This is a string</p> for test.'
truncate(html, {
length: 10,
ellipsis: '~'
})
// returns: <p><img src="abc.png">This is a ~</p>
// exclude some special elements(by selector), they will be removed before counting content's length
var html = '<p><img src="abc.png">This is a string</p> for test.'
truncate(html, {
length: 10,
ellipsis: '~',
excludes: 'img'
})
// returns: <p>This is a ~</p>
// exclude more than one category elements
var html =
'<p><img src="abc.png">This is a string</p><div class="something-unwanted"> unwanted string inserted ( ´•̥̥̥ω•̥̥̥` )</div> for test.'
truncate(html, {
length: 20,
stripTags: true,
ellipsis: '~',
excludes: ['img', '.something-unwanted']
})
// returns: This is a string for~
// handing encoded characters
var html = '<p> test for <p> encoded string</p>'
truncate(html, {
length: 20,
decodeEntities: true
})
// returns: <p> test for <p> encode...</p>
// when set decodeEntities false
var html = '<p> test for <p> encoded string</p>'
truncate(html, {
length: 20,
decodeEntities: false // this is the default value
})
// returns: <p> test for <p...</p>
// and there may be a surprise by setting `decodeEntities` to true when handing CJK characters
var html = '<p> test for <p> 中文 string</p>'
truncate(html, {
length: 20,
decodeEntities: true
})
// returns: <p> test for <p> 中文 str...</p>
// to fix this, see below for instructions
// custom node strategy to keep some special elements
var html = '<p><img src="abc.png"><i>italic<b>bold</b></i>This is a string</p> for test.'
truncate(html, {
length: 10,
customNodeStrategy: node => {
if (node.is('img')) {
return 'remove'
}
if (node.is('i')) {
return 'keep'
}
}
})
// returns: <p><i>italic<b>bold</b></i>This is a ...</p>
// custom node strategy to truncate summary instead of original node
var html = '<div><details><summary>Click me</summary><p>Some details</p></details>other things</div>'
truncate(html, {
length: 10,
customNodeStrategy: node => {
if (node.is('details')) {
return node.find('summary')
}
}
})
// returns: <div><details><summary>Click me</summary><p>Some details</p></details>ot...</div>
for More usages, check truncate.spec.ts
Credits
Thanks to:
- @calebeno es6 support and unit tests
- @aaditya-thakkar emoji truncating support