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element-queries.js
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element-queries.js
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/*
# EQCSS
## version 1.8.0
A JavaScript plugin to read EQCSS syntax to provide:
scoped styles, element queries, container queries,
meta-selectors, eval(), and element-based units.
- github.com/eqcss/eqcss
- elementqueries.com
Authors: Tommy Hodgins, Maxime Euzière
License: MIT
*/
// Uses Node, AMD or browser globals to create a module
(function (root, factory) {
if (typeof define === 'function' && define.amd) {
// AMD: Register as an anonymous module
define([], factory)
} else if (typeof module === 'object' && module.exports) {
// Node: Does not work with strict CommonJS, but
// only CommonJS-like environments that support module.exports,
// like Node
module.exports = factory()
} else {
// Browser globals (root is window)
root.EQCSS = factory()
}
}(this, function() {
var EQCSS = {
data: [],
version: '1.7.3'
}
/*
* EQCSS.load()
* Called automatically on page load.
* Call it manually after adding EQCSS code in the page.
* Loads and parses all the EQCSS code.
*/
EQCSS.load = function() {
// Retrieve all style blocks
var styles = document.getElementsByTagName('style')
for (var i = 0; i < styles.length; i++) {
if (styles[i].namespaceURI !== 'http://www.w3.org/2000/svg') {
// Test if the style is not read yet
if (styles[i].getAttribute('data-eqcss-read') === null) {
// Mark the style block as read
styles[i].setAttribute('data-eqcss-read', 'true')
// Process
EQCSS.process(styles[i].innerHTML)
}
}
}
// Retrieve all script blocks
var script = document.getElementsByTagName('script')
for (i = 0; i < script.length; i++) {
// Test if the script is not read yet and has type='text/eqcss'
if (script[i].getAttribute('data-eqcss-read') === null && script[i].type === 'text/eqcss') {
// Test if they contain external EQCSS code
if (script[i].src) {
// retrieve the file content with AJAX and process it
(function() {
var xhr = new XMLHttpRequest
xhr.open('GET', script[i].src, true)
xhr.send(null)
xhr.onreadystatechange = function() {
EQCSS.process(xhr.responseText)
}
})()
}
// or embedded EQCSS code
else {
// Process
EQCSS.process(script[i].innerHTML)
}
// Mark the script block as read
script[i].setAttribute('data-eqcss-read', 'true')
}
}
// Retrieve all link tags
var link = document.getElementsByTagName('link')
for (i = 0; i < link.length; i++) {
// Test if the link is not read yet, and has rel=stylesheet
if (link[i].getAttribute('data-eqcss-read') === null && link[i].rel === 'stylesheet') {
// retrieve the file content with AJAX and process it
if (link[i].href) {
(function() {
var xhr = new XMLHttpRequest
xhr.open('GET', link[i].href, true)
xhr.send(null)
xhr.onreadystatechange = function() {
EQCSS.process(xhr.responseText)
}
})()
}
// Mark the link as read
link[i].setAttribute('data-eqcss-read', 'true')
}
}
}
/*
* EQCSS.parse()
* Called by load for each script / style / link resource.
* Generates data for each Element Query found
*/
EQCSS.parse = function(code) {
var parsed_queries = new Array()
// Cleanup
code = code || ''
code = code.replace(/\s+/g, ' '); // reduce spaces and line breaks
code = code.replace(/\/\*[\w\W]*?\*\//g, '') // remove comments
code = code.replace(/@element/g, '\n@element') // one element query per line
code = code.replace(/(@element.*?\{([^}]*?\{[^}]*?\}[^}]*?)*\}).*/g, '$1') // Keep the queries only (discard regular css written around them)
// Parse
// For each query
code.replace(/(@element.*(?!@element))/g, function(string, query) {
// Create a data entry
var dataEntry = {}
// Extract the selector
query.replace(/(@element)\s*(".*?"|'.*?'|.*?)\s*(and\s*\(|{)/g, function(string, atrule, selector) {
// Strip outer quotes if present
selector = selector.replace(/^\s?['](.*)[']/, '$1')
selector = selector.replace(/^\s?["](.*)["]/, '$1')
dataEntry.selector = selector
})
// Extract the conditions
dataEntry.conditions = []
query.replace(/and ?\( ?([^:]*) ?: ?([^)]*) ?\)/g, function(string, measure, value) {
// Separate value and unit if it's possible
var unit = null
unit = value.replace(/^(\d*\.?\d+)(\D+)$/, '$2')
if (unit === value) {
unit = null
}
value = value.replace(/^(\d*\.?\d+)\D+$/, '$1')
dataEntry.conditions.push({measure: measure, value: value, unit: unit})
})
// Extract the styles
query.replace(/{(.*)}/g, function(string, style) {
dataEntry.style = style
})
// Add it to data
parsed_queries.push(dataEntry)
})
return parsed_queries
}
/*
* EQCSS.register()
* Add a single object, or an array of objects to EQCSS.data
*
*/
EQCSS.register = function(queries) {
if (Object.prototype.toString.call(queries) === '[object Object]') {
EQCSS.data.push(queries)
EQCSS.apply()
}
if (Object.prototype.toString.call(queries) === '[object Array]') {
for (var i=0; i<queries.length; i++) {
EQCSS.data.push(queries[i])
}
EQCSS.apply()
}
}
/*
* EQCSS.process()
* Parse and Register queries with `EQCSS.data`
*/
EQCSS.process = function(code) {
var queries = EQCSS.parse(code)
return EQCSS.register(queries)
}
/*
* EQCSS.apply()
* Called on load, on resize and manually on DOM update
* Enable the Element Queries in which the conditions are true
*/
EQCSS.apply = function() {
var i, j, k // Iterators
var elements // Elements targeted by each query
var element_guid // GUID for current element
var css_block // CSS block corresponding to each targeted element
var element_guid_parent // GUID for current element's parent
var element_guid_prev // GUID for current element's previous sibling element
var element_guid_next // GUID for current element's next sibling element
var css_code // CSS code to write in each CSS block (one per targeted element)
var element_width, parent_width // Computed widths
var element_height, parent_height // Computed heights
var element_line_height // Computed line-height
var test // Query's condition test result
var computed_style // Each targeted element's computed style
var parent_computed_style // Each targeted element parent's computed style
// Loop on all element queries
for (i = 0; i < EQCSS.data.length; i++) {
// Find all the elements targeted by the query
elements = document.querySelectorAll(EQCSS.data[i].selector)
// Loop on all the elements
for (j = 0; j < elements.length; j++) {
// Create a guid for this element
// Pattern: 'EQCSS_{element-query-index}_{matched-element-index}'
element_guid = 'data-eqcss-' + i + '-' + j
// Add this guid as an attribute to the element
elements[j].setAttribute(element_guid, '')
// Create a guid for the parent of this element
// Pattern: 'EQCSS_{element-query-index}_{matched-element-index}_parent'
element_guid_parent = 'data-eqcss-' + i + '-' + j + '-parent'
// Add this guid as an attribute to the element's parent (except if element is the root element)
if (elements[j] != document.documentElement) {
elements[j].parentNode.setAttribute(element_guid_parent, '')
}
// Create a guid for the prev sibling of this element
// Pattern: 'EQCSS_{element-query-index}_{matched-element-index}_prev'
element_guid_prev = 'data-eqcss-' + i + '-' + j + '-prev'
// Add this guid as an attribute to the element's prev sibling
var prev_sibling = (function(el) {
while ((el = el.previousSibling)) {
if (el.nodeType === 1) {
return el
}
}
})(elements[j])
// If there is a previous sibling, add attribute
if (prev_sibling) {
prev_sibling.setAttribute(element_guid_prev, '')
}
// Create a guid for the next sibling of this element
// Pattern: 'EQCSS_{element-query-index}_{matched-element-index}_next'
element_guid_next = 'data-eqcss-' + i + '-' + j + '-next'
// Add this guid as an attribute to the element's next sibling
var next_sibling = (function(el) {
while ((el = el.nextSibling)) {
if (el.nodeType === 1) {
return el
}
}
})(elements[j])
// If there is a next sibling, add attribute
if (next_sibling) {
next_sibling.setAttribute(element_guid_next, '')
}
// Get the CSS block associated to this element (or create one in the <HEAD> if it doesn't exist)
css_block = document.querySelector('#' + element_guid)
if (!css_block) {
css_block = document.createElement('style')
css_block.id = element_guid
css_block.setAttribute('data-eqcss-read', 'true')
document.querySelector('head').appendChild(css_block)
}
css_block = document.querySelector('#' + element_guid)
// Reset the query test's result (first, we assume that the selector is matched)
test = true
// Loop on the conditions
test_conditions: for (k = 0; k < EQCSS.data[i].conditions.length; k++) {
// Reuse element and parent's computed style instead of computing it everywhere
computed_style = window.getComputedStyle(elements[j], null)
parent_computed_style = null
if (elements[j] != document.documentElement) {
parent_computed_style = window.getComputedStyle(elements[j].parentNode, null)
}
// Do we have to reconvert the size in px at each call?
// This is true only for vw/vh/vmin/vmax
var recomputed = false
var value
// If the condition's unit is vw, convert current value in vw, in px
if (EQCSS.data[i].conditions[k].unit === 'vw') {
recomputed = true
value = parseInt(EQCSS.data[i].conditions[k].value)
EQCSS.data[i].conditions[k].recomputed_value = value * window.innerWidth / 100
}
// If the condition's unit is vh, convert current value in vh, in px
else if (EQCSS.data[i].conditions[k].unit === 'vh') {
recomputed = true
value = parseInt(EQCSS.data[i].conditions[k].value)
EQCSS.data[i].conditions[k].recomputed_value = value * window.innerHeight / 100
}
// If the condition's unit is vmin, convert current value in vmin, in px
else if (EQCSS.data[i].conditions[k].unit === 'vmin') {
recomputed = true
value = parseInt(EQCSS.data[i].conditions[k].value)
EQCSS.data[i].conditions[k].recomputed_value = value * Math.min(window.innerWidth, window.innerHeight) / 100
}
// If the condition's unit is vmax, convert current value in vmax, in px
else if (EQCSS.data[i].conditions[k].unit === 'vmax') {
recomputed = true
value = parseInt(EQCSS.data[i].conditions[k].value)
EQCSS.data[i].conditions[k].recomputed_value = value * Math.max(window.innerWidth, window.innerHeight) / 100
}
// If the condition's unit is set and is not px or %, convert it into pixels
else if (EQCSS.data[i].conditions[k].unit != null && EQCSS.data[i].conditions[k].unit != 'px' && EQCSS.data[i].conditions[k].unit != '%') {
// Create a hidden DIV, sibling of the current element (or its child, if the element is <html>)
// Set the given measure and unit to the DIV's width
// Measure the DIV's width in px
// Remove the DIV
var div = document.createElement('div')
div.style.visibility = 'hidden'
div.style.border = '1px solid red'
div.style.width = EQCSS.data[i].conditions[k].value + EQCSS.data[i].conditions[k].unit
var position = elements[j]
if (elements[j] != document.documentElement) {
position = elements[j].parentNode
}
position.appendChild(div)
EQCSS.data[i].conditions[k].value = parseInt(window.getComputedStyle(div, null).getPropertyValue('width'))
EQCSS.data[i].conditions[k].unit = 'px'
position.removeChild(div)
}
// Store the good value in final_value depending if the size is recomputed or not
var final_value = recomputed ? EQCSS.data[i].conditions[k].recomputed_value : parseInt(EQCSS.data[i].conditions[k].value)
// Check each condition for this query and this element
// If at least one condition is false, the element selector is not matched
switch (EQCSS.data[i].conditions[k].measure) {
// Min-width
case 'min-width':
// Min-width in px
if (recomputed === true || EQCSS.data[i].conditions[k].unit === 'px') {
element_width = parseInt(computed_style.getPropertyValue('width'))
if (!(element_width >= final_value)) {
test = false
break test_conditions
}
}
// Min-width in %
if (EQCSS.data[i].conditions[k].unit === '%') {
element_width = parseInt(computed_style.getPropertyValue('width'))
parent_width = parseInt(parent_computed_style.getPropertyValue('width'))
if (!(parent_width / element_width <= 100 / final_value)) {
test = false
break test_conditions
}
}
break
// Max-width
case 'max-width':
// Max-width in px
if (recomputed === true || EQCSS.data[i].conditions[k].unit === 'px') {
element_width = parseInt(computed_style.getPropertyValue('width'))
if (!(element_width <= final_value)) {
test = false
break test_conditions
}
}
// Max-width in %
if (EQCSS.data[i].conditions[k].unit === '%') {
element_width = parseInt(computed_style.getPropertyValue('width'))
parent_width = parseInt(parent_computed_style.getPropertyValue('width'))
if (!(parent_width / element_width >= 100 / final_value)) {
test = false
break test_conditions
}
}
break
// Min-height
case 'min-height':
// Min-height in px
if (recomputed === true || EQCSS.data[i].conditions[k].unit === 'px') {
element_height = parseInt(computed_style.getPropertyValue('height'))
if (!(element_height >= final_value)) {
test = false
break test_conditions
}
}
// Min-height in %
if (EQCSS.data[i].conditions[k].unit === '%') {
element_height = parseInt(computed_style.getPropertyValue('height'))
parent_height = parseInt(parent_computed_style.getPropertyValue('height'))
if (!(parent_height / element_height <= 100 / final_value)) {
test = false
break test_conditions
}
}
break
// Max-height
case 'max-height':
// Max-height in px
if (recomputed === true || EQCSS.data[i].conditions[k].unit === 'px') {
element_height = parseInt(computed_style.getPropertyValue('height'))
if (!(element_height <= final_value)) {
test = false
break test_conditions
}
}
// Max-height in %
if (EQCSS.data[i].conditions[k].unit === '%') {
element_height = parseInt(computed_style.getPropertyValue('height'))
parent_height = parseInt(parent_computed_style.getPropertyValue('height'))
if (!(parent_height / element_height >= 100 / final_value)) {
test = false
break test_conditions
}
}
break
// Min-scroll-x
case 'min-scroll-x':
var element = elements[j]
var element_scroll = element.scrollLeft
if (!element.hasScrollListener) {
if (element === document.documentElement || element === document.body) {
window.addEventListener('scroll', function() {
EQCSS.throttle()
element.hasScrollListener = true
})
} else {
element.addEventListener('scroll', function() {
EQCSS.throttle()
element.hasScrollListener = true
})
}
}
// Min-scroll-x in px
if (recomputed === true || EQCSS.data[i].conditions[k].unit === 'px') {
if (!(element_scroll >= final_value)) {
test = false
break test_conditions
}
}
// Min-scroll-x in %
else if (EQCSS.data[i].conditions[k].unit === '%') {
var element_scroll_size = elements[j].scrollWidth
var element_size
if (elements[j] === document.documentElement || elements[j] === document.body) {
element_size = window.innerWidth
} else {
element_size = parseInt(computed_style.getPropertyValue('width'))
}
if (!((element_scroll / (element_scroll_size - element_size)) * 100 >= final_value)) {
test = false
break test_conditions
}
}
break
// Min-scroll-y
case 'min-scroll-y':
element = elements[j]
element_scroll = elements[j].scrollTop
if (!element.hasScrollListener) {
if (element === document.documentElement || element === document.body) {
window.addEventListener('scroll', function() {
EQCSS.throttle()
element.hasScrollListener = true
})
} else {
element.addEventListener('scroll', function() {
EQCSS.throttle()
element.hasScrollListener = true
})
}
}
// Min-scroll-y in px
if (recomputed === true || EQCSS.data[i].conditions[k].unit === 'px') {
if (!(element_scroll >= final_value)) {
test = false
break test_conditions
}
}
// Min-scroll-y in %
else if (EQCSS.data[i].conditions[k].unit === '%') {
element_scroll_size = elements[j].scrollHeight
element_size
if (elements[j] === document.documentElement || elements[j] === document.body) {
element_size = window.innerHeight
} else {
element_size = parseInt(computed_style.getPropertyValue('height'))
}
if (!((element_scroll / (element_scroll_size - element_size)) * 100 >= final_value)) {
test = false
break test_conditions
}
}
break
// Max-scroll-x
case 'max-scroll-x':
element = elements[j]
element_scroll = elements[j].scrollLeft
if (!element.hasScrollListener) {
if (element === document.documentElement || element === document.body) {
window.addEventListener('scroll', function() {
EQCSS.throttle()
element.hasScrollListener = true
})
} else {
element.addEventListener('scroll', function() {
EQCSS.throttle()
element.hasScrollListener = true
})
}
}
// Max-scroll-x in px
if (recomputed === true || EQCSS.data[i].conditions[k].unit === 'px') {
if (!(element_scroll <= final_value)) {
test = false
break test_conditions
}
}
// Max-scroll-x in %
else if (EQCSS.data[i].conditions[k].unit === '%') {
element_scroll_size = elements[j].scrollWidth
element_size
if (elements[j] === document.documentElement || elements[j] === document.body) {
element_size = window.innerWidth
} else {
element_size = parseInt(computed_style.getPropertyValue('width'))
}
if (!((element_scroll / (element_scroll_size - element_size)) * 100 <= final_value)) {
test = false
break test_conditions
}
}
break
// Max-scroll-y
case 'max-scroll-y':
element = elements[j]
element_scroll = elements[j].scrollTop
if (!element.hasScrollListener) {
if (element === document.documentElement || element === document.body) {
window.addEventListener('scroll', function() {
EQCSS.throttle()
element.hasScrollListener = true
})
} else {
element.addEventListener('scroll', function() {
EQCSS.throttle()
element.hasScrollListener = true
})
}
}
// Max-scroll-y in px
if (recomputed === true || EQCSS.data[i].conditions[k].unit === 'px') {
if (!(element_scroll <= final_value)) {
test = false
break test_conditions
}
}
// Max-scroll-y in %
else if (EQCSS.data[i].conditions[k].unit === '%') {
element_scroll_size = elements[j].scrollHeight
element_size
if (elements[j] === document.documentElement || elements[j] === document.body) {
element_size = window.innerHeight
} else {
element_size = parseInt(computed_style.getPropertyValue('height'))
}
if (!((element_scroll / (element_scroll_size - element_size)) * 100 <= final_value)) {
test = false
break test_conditions
}
}
break
// Min-characters
case 'min-characters':
// form inputs
if (elements[j].value) {
if (!(elements[j].value.length >= final_value)) {
test = false
break test_conditions
}
}
// blocks
else {
if (!(elements[j].textContent.length >= final_value)) {
test = false
break test_conditions
}
}
break
// Max-characters
case 'max-characters':
// form inputs
if (elements[j].value) {
if (!(elements[j].value.length <= final_value)) {
test = false
break test_conditions
}
}
// blocks
else {
if (!(elements[j].textContent.length <= final_value)) {
test = false
break test_conditions
}
}
break
// Min-children
case 'min-children':
if (!(elements[j].children.length >= final_value)) {
test = false
break test_conditions
}
break
// Max-children
case 'max-children':
if (!(elements[j].children.length <= final_value)) {
test = false
break test_conditions
}
break
// Min-lines
case 'min-lines':
element_height =
parseInt(computed_style.getPropertyValue('height'))
- parseInt(computed_style.getPropertyValue('border-top-width'))
- parseInt(computed_style.getPropertyValue('border-bottom-width'))
- parseInt(computed_style.getPropertyValue('padding-top'))
- parseInt(computed_style.getPropertyValue('padding-bottom'))
element_line_height = computed_style.getPropertyValue('line-height')
if (element_line_height === 'normal') {
var element_font_size = parseInt(computed_style.getPropertyValue('font-size'))
element_line_height = element_font_size * 1.125