dom-regex
v0.0.3
Published
JavaScript library for querying DOM elements with Regular Expressions
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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]/);
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');