320 lines
14 KiB
Markdown
320 lines
14 KiB
Markdown
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# html-to-text
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[](https://travis-ci.org/werk85/node-html-to-text)
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[](https://codeclimate.com/github/werk85/node-html-to-text/coverage)
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An advanced converter that parses HTML and returns beautiful text. It was mainly designed to transform HTML E-Mail templates to a text representation. So it is currently optimized for table layouts.
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### Features:
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* Transform headlines to uppercase text.
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* Convert tables to an appropiate text representation with rows and columns.
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* Word wrapping for paragraphs (default 80 chars).
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* Automatic extraction of href information from links.
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* `<br>` conversion to `\n`.
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* Unicode support.
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* Runs in browser and server environments.
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## Installation
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```
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npm install html-to-text
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```
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Or when you want to use it as command line interface it is recommended to install it globally via
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```
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npm install html-to-text -g
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```
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## Usage
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```js
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const htmlToText = require('html-to-text');
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const text = htmlToText.fromString('<h1>Hello World</h1>', {
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wordwrap: 130
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});
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console.log(text); // Hello World
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```
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### Options:
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You can configure the behaviour of html-to-text with the following options:
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* `tables` allows to select certain tables by the `class` or `id` attribute from the HTML document. This is necessary because the majority of HTML E-Mails uses a table based layout. Prefix your table selectors with an `.` for the `class` and with a `#` for the `id` attribute. All other tables are ignored. You can assign `true` to this attribute to select all tables. Default: `[]`
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* `wordwrap` defines after how many chars a line break should follow in `p` elements. Set to `null` or `false` to disable word-wrapping. Default: `80`
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* `linkHrefBaseUrl` allows you to specify the server host for href attributes, where the links start at the root (`/`). For example, `linkHrefBaseUrl = 'http://asdf.com'` and `<a href='/dir/subdir'>...</a>` the link in the text will be `http://asdf.com/dir/subdir`. Keep in mind that `linkHrefBaseUrl` shouldn't end with a `/`.
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* `hideLinkHrefIfSameAsText` by default links are translated the following `<a href='link'>text</a>` => becomes => `text [link]`. If this option is set to true and `link` and `text` are the same, `[link]` will be hidden and only `text` visible.
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* `noLinkBrackets` dont print brackets around the link if `true`.
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* `ignoreHref` ignore all document links if `true`.
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* `ignoreImage` ignore all document images if `true`.
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* `preserveNewlines` by default, any newlines `\n` in a block of text will be removed. If `true`, these newlines will not be removed.
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* `decodeOptions` defines the text decoding options given to `he.decode`. For more informations see the [he](https://github.com/mathiasbynens/he) module.
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* `uppercaseHeadings` by default, headings (`<h1>`, `<h2>`, etc) are uppercased. Set to `false` to leave headings as they are.
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* `singleNewLineParagraphs` by default, paragraphs are converted with two newlines (`\n\n`). Set to `true` to convert to a single newline.
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* `baseElement` defines the tags whose text content will be captured from the html. All content will be captured below the baseElement tags and added to the resulting text output. This option allows the user to specify an array of elements as base elements using a single tag with css class and id parameters e.g. [`p.class1.class2#id1#id2`, `p.class1.class2#id1#id2`] . Default: `body`
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* `returnDomByDefault` convert the entire document if we don't find the tag we're looking for if `true`.
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* `longWordSplit` describes how to wrap long words, has the following parameters:
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* `wrapCharacters` is an array containing the characters that may be wrapped on, these are used in order
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* `forceWrapOnLimit` defines whether to break long words on the limit if `true`.
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* `format` pass an object to enable custom formatting for specific elements (see below)
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* `unorderedListItemPrefix` defines the string that is used as item prefix for unordered lists `<ol>`. Default: `' * '`
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### Override formatting for specific elements
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By using the `format` option, you can specify formatting for these elements: `text`, `image`, `lineBreak`, `paragraph`, `anchor`, `heading`, `table`, `orderedList`, `unorderedList`, `listItem`, `horizontalLine`.
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Each key must be a function which eventually receive `elem` (the current elem), `fn` (the next formatting function) and `options` (the options passed to html-to-text).
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```js
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var htmlToText = require('html-to-text');
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var text = htmlToText.fromString('<h1>Hello World</h1>', {
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format: {
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heading: function (elem, fn, options) {
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var h = fn(elem.children, options);
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return '====\n' + h.toUpperCase() + '\n====';
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}
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}
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});
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console.log(text);
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```
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## Command Line Interface
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It is possible to use html-to-text as command line interface. This allows an easy validation of your generated text and the integration in other systems that does not run on node.js.
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`html-to-text` uses `stdin` and `stdout` for data in and output. So you can use `html-to-text` the following way:
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```
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cat example/test.html | html-to-text > test.txt
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```
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There also all options available as described above. You can use them like this:
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```
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cat example/test.html | html-to-text --tables=#invoice,.address --wordwrap=100 > test.txt
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```
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The `tables` option has to be declared as comma separated list without whitespaces.
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## Example
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```html
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<html>
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<head>
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<meta charset="utf-8">
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</head>
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<body>
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<table cellpadding="0" cellspacing="0" border="0">
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<tr>
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<td>
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<h2>Paragraphs</h2>
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<p class="normal-space">At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. <a href="www.github.com">Github</a>
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</p>
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<p class="normal-space">At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.
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</p>
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</td>
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<td></td>
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</tr>
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<tr>
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<td>
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<hr/>
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<h2>Pretty printed table</h2>
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<table id="invoice">
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<thead>
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<tr>
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<th>Article</th>
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<th>Price</th>
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<th>Taxes</th>
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<th>Amount</th>
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<th>Total</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td>
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<p>
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Product 1<br />
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<span style="font-size:0.8em">Contains: 1x Product 1</span>
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</p>
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</td>
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<td align="right" valign="top">6,99€</td>
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<td align="right" valign="top">7%</td>
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<td align="right" valign="top">1</td>
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<td align="right" valign="top">6,99€</td>
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</tr>
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<tr>
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<td>Shipment costs</td>
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<td align="right">3,25€</td>
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<td align="right">7%</td>
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<td align="right">1</td>
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<td align="right">3,25€</td>
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</tr>
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</tbody>
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<tfoot>
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<tr>
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<td> </td>
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<td> </td>
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<td colspan="3">to pay: 10,24€</td>
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</tr>
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<tr>
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<td></td>
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<td></td>
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<td colspan="3">Taxes 7%: 0,72€</td>
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</tr>
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</tfoot>
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</table>
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</td>
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<td></td>
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</tr>
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<tr>
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<td>
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<hr/>
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<h2>Lists</h2>
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<ul>
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<li>At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.</li>
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<li>At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.</li>
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</ul>
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<ol>
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<li>At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.</li>
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<li>At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.</li>
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</ol>
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</td>
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</tr>
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<tr>
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<td>
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<hr />
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<h2>Column Layout with tables</h2>
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<table class="address">
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<tr>
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<th align="left">Invoice Address</th>
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<th align="left">Shipment Address</th>
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</tr>
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<tr>
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<td align="left">
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<p>
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Mr.<br/>
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John Doe<br/>
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Featherstone Street 49<br/>
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28199 Bremen<br/>
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</p>
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</td>
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<td align="left">
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<p>
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Mr.<br/>
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John Doe<br/>
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Featherstone Street 49<br/>
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28199 Bremen<br/>
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</p>
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</td>
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</tr>
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</table>
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</td>
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<td></td>
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</tr>
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<tr>
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<td>
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<hr/>
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<h2>Mailto formating</h2>
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<p class="normal-space small">
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Some Company<br />
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Some Street 42<br />
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Somewhere<br />
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E-Mail: <a href="mailto:test@example.com">Click here</a>
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</p>
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</td>
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</tr>
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</table>
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</body>
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</html>
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```
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Gets converted to:
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```
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PARAGRAPHS
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At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd
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gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum
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dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor
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invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos
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et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea
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takimata sanctus est Lorem ipsum dolor sit amet. Github [www.github.com]
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At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd
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gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum
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dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor
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invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos
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et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea
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takimata sanctus est Lorem ipsum dolor sit amet.
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--------------------------------------------------------------------------------
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PRETTY PRINTED TABLE
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ARTICLE PRICE TAXES AMOUNT TOTAL
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Product 1 6,99€ 7% 1 6,99€
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Contains: 1x Product 1
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Shipment costs 3,25€ 7% 1 3,25€
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to pay: 10,24€
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Taxes 7%: 0,72€
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--------------------------------------------------------------------------------
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LISTS
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* At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd
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gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.
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* At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd
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gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.
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1. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd
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gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.
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2. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd
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gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.
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--------------------------------------------------------------------------------
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COLUMN LAYOUT WITH TABLES
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INVOICE ADDRESS SHIPMENT ADDRESS
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Mr. Mr.
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John Doe John Doe
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Featherstone Street 49 Featherstone Street 49
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28199 Bremen 28199 Bremen
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--------------------------------------------------------------------------------
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MAILTO FORMATING
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Some Company
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Some Street 42
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Somewhere
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E-Mail: Click here [test@example.com]
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```
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## License
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(The MIT License)
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Copyright (c) 2019 werk85 <malte@werk85.de>
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
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'Software'), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject to
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the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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