dom-regex

A JavaScript library for querying DOM elements with Regular Expressions.

This library is UMD wrapped so it can be used with or without a module loader such as requireJS.

Install

npm install --save dom-regex

Note: If this library is exposed directly to the window, it operates under the global variable DomRegex. Keep in mind you may be in an environment (ex: webpack) that requires you explicitly expose it to the window if you intend to use if from a window perspective.

Example Usage

let DomRegex = require('dom-regex');
 
// find all elements with any data- attribute
let elements = DomRegex.all(/data-[a-z]/);

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The following examples and methods behave like querySelectorAll and querySelector. The methods that use all return all matching instances. The methods that use one return only the first instance found.

Querying through all the elements on the window

Methods:
DomRegex.all(regex [, attributeName])
DomRegex.one(regex [, attributeName])

When not using an attribute name, the regex is applied to the entire inside contents of the element's opening tag. If the tag is <div class="bar" data-id="141pop"> then the regex would be applied to div class="bar" data-id="141pop"

Finding all matches on the window:

let elements = DomRegex.all(/data-[a-z]/);

Finding the first match on the window:

let element = DomRegex.one(/data-[a-z]/);

Find all elements that have an attribute value that matches a Regular Expression

When using an attribute name, the regex is applied to the value of the attribute. If the element's opening tag was <div class="bar" data-id="141pop"> and the attribute name supplied was data-id, then the regex would be tested against 141pop.

Finding all matches against an attribute name:

// find all elements that have a data-id attribute that starts with 3 digits
let elements = DomRegex.all(/^\d{3}/, 'data-id');

Finding one match against an attribute name:

let element = DomRegex.one(/^\d{3}/, 'data-id');

Querying children of elements

Querying "inside" of elements is much like using querySelectorAll on an HTMLElement (element.querySelectorAll('...')). This method takes it a step further by offering the ability to query inside lists of elements, or by using selectors.

Methods:
DomRegex.all.inside(query, regex [, attributeName])
DomRegex.one.inside(query, regex [, attributeName])

Querying inside of a specific element:

// find all custom elements inside of #element
let element = document.getElementById('#element');
let customElement = DomRegex.all.inside(element, /^[a-z]+-[a-z]+/);

Querying inside elements using a selector:

// find all custom elements inside of any div with a class of "bar"
let customElement = DomRegex.all.inside('div.bar', /^[a-z]+-[a-z]+/);

Querying inside each element in a NodeList

let divs = document.querySelectorAll('div');
let elements = DomRegex.all.inside(divs, /\d+/, 'data-id');

Querying inside each element in an Array

let elements = DomRegex.all.inside(arrayOfElements, /\d+/, 'data-id');

Querying against elements

When querying against elements, you apply the regex directly to the element. This allows you to filter elements that you have already obtained.

Methods:
DomRegex.all.against(query, regex, [, attributeName])
DomRegex.one.against(query, regex, [, attributeName])

Applying regex to a specific element

let element = document.getElementById('#element');
let customElement = DomRegex.all.against(element, /^[a-z]+-[a-z]+/);
// if this passes, it would return the element in an array because we are using `all`

Applying regex to elements that match a selector

// this will test all divs with a class of "bar"
let customElement = DomRegex.all.against('div.bar', /\d{3}/, 'data-id');

Applying regex to elements inside of a NodeList

let divs = document.querySelectorAll('div');
let elements = DomRegex.all.against(divs, /\d+/, 'data-id');

Applying regex to elements inside of an array

let elements = DomRegex.all.against(arrayOfElements, /\d+/, 'data-id');

Other Examples:

Get all elements with a data- attribute

let elements = DomRegex.all(/data-[a-z]/);

Get all elements that have a data-id attribute that conforms to a pattern, (for example 3 numbers followed 3 letters):

let elements = DomRegex.all(/^\d{3}[a-z]{3}$/i, 'data-id');