I have some JS functionality that changes the css class on my body element. Based on a click, i will change the css class of my body element to one of the following: .font-default, .font-medium, and .font-large.
I have the following mixins that determines the font size of an element based on the body element's class. That looks like this:
#function rem-calc($size) {
$remSize: $size / 16;
#return #{$remSize}rem;
}
#mixin font-size($size) {
#if $size >= 20 {
font-size: rem-calc($size);
} #else if $size == 18 {
font-size: rem-calc(18);
.font-large & {
font-size: rem-calc(20);
}
} #else {
font-size: rem-calc($size);
.font-medium & {
font-size: rem-calc($size + 2);
}
.font-large & {
font-size: rem-calc($size + 4);
}
}
}
An example of me using this mixin is as follows:
.content {
#include font-size(16);
#media (min-width: 1024px) {
#include font-size(30);
}
}
Here's is the corresponding html and css on the linked codepen at the bottom:
<body class="body">
<div class="content">Content</div>
<button class="button">
click to add
</button>
</body>
<script>
const button = document.querySelector('.button')
button.addEventListener('click', () => {
console.log(document.querySelector('.body'))
document.querySelector('.body').classList.add('font-medium');
})
</script>
According to my ruleset (the mixin), in the desktop version, font-size should remain unchanged since size >= 20. However in practice, when I click the button that changes the class to medium, it uses the "mobile" version of the style and overwrites the style that's placed in the media query.
Is there anyway regarding specificity such that I can still use this mixin so that the mobile styles don't bleed into the styles nested in the media queries?
If not, what might be a different solution to this problem?
Here's a pen that shows the issue. When clicking the button, I want the font to remain unchanged. https://codepen.io/rv-akim/pen/WVJpWj
You can clearly see that .font-medium .content is overriding .content due to the fact the former is more specific even though .content is inside of a media query.
Update your code so your normal state of the font size uses a class
#mixin font-size($size) {
#if $size >= 20 {
.normal & {
font-size: rem-calc($size);
}
} #else if $size == 18 {
.normal & {
font-size: rem-calc(18);
}
.font-large & {
font-size: rem-calc(20);
}
} #else {
.normal & {
font-size: rem-calc($size);
}
.font-medium & {
font-size: rem-calc($size + 2);
}
.font-large & {
font-size: rem-calc($size + 4);
}
}
}
.content {
#include font-size(16);
#media (min-width: 1024px) {
#include font-size(30);
}
}
Add class normal to your body tag
<body class="body normal">
Basically, where you only declared the font size rule, I wrapped it with .normal & {}
If you learn to use the Inspector, it will save you tons of headaches later
This is a simple todo app built with react, bulma, and css grid. When I reload the page in chrome the height of the input form changes from 385x27.27 to 385x58.45, and lowers itself to the point of breaking through the bottom boundary of my css grid. I don't think this has much to do with my react code since I tested my app in firefox and edge which did not have this issue.
I also tried clearing my cache, cookies etc. for chrome which did not fix the issue. Surprisingly as soon as you type something into the input box (just typing) it fixes itself to the proper proportions. But as soon as you refresh, it breaks again. I should also note that it's broken on first render of the page (not just refreshing).
I suspect it has to do with my grid and how I wrapped the html elements (I'm still learning), or maybe event.prevent.default() and .reset() inside my react code are interfering with grid? I'm really not sure, and without error messages this has been hard to troubleshoot. I included the full code for my app below and images of the problem.
Page first loaded or refreshed (broken)
Page after typing "p" into the input (correct)
Index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<link rel="shortcut icon" href="%PUBLIC_URL%/favicon.ico" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<meta name="theme-color" content="#000000" />
<link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.8.2/css/all.css" integrity="sha384-oS3vJWv+0UjzBfQzYUhtDYW+Pj2yciDJxpsK1OYPAYjqT085Qq/1cq5FLXAZQ7Ay" crossorigin="anonymous">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bulma/0.7.5/css/bulma.min.css">
<link rel="manifest" href="%PUBLIC_URL%/manifest.json" />
<title>React App</title>
</head>
<body>
<noscript>You need to enable JavaScript to run this app.</noscript>
<div id="root"></div>
</body>
</html>
App.js
import React, { Component } from 'react';
import './App.css';
/* InputTaskForm renders a form, and returns the input to our storeTask method. */
const InputTaskForm = ({ formValidation }) => {
return (
<form name="charlie" className="charlie" onSubmit={formValidation}>
<input name="userinput" type="text" placeholder="Task..." size="35"/>
<button className="button is-info is-small" type="submit">Submit</button>
</form>
);
}
const DisplayTasks = ({ tasksArray, removeTask, crossOutTask }) => {
return (
<div id="orderedList">
<ol>
{/* Create our list items and corresponding buttons by mapping over the tasks array. The array is currently made up of objects with a title and crossedOut key. Therefore keep in mind the task prop is carrying objects, not the task title itself */}
{tasksArray.map((task, index) => (
<li onClick={ () => crossOutTask(index) } key={index} >
{/* Check the crossedOut value of the current task object. If crossedOut is true display it crossed out, else display it uncrossed */}
{ task.crossedOut
? <strike>{task.title}</strike>
: task.title }
<button className="removeButton button is-danger is-small" onClick={ event => removeTask(event, index) } >Remove</button>
</li>
))}
</ol>
</div>
);
};
class App extends Component {
state = {
userinput: '',
tasksarray: [],
}
/* ============================================== #FUNCTIONS ==============================================
=========================================================================================================== */
formValidation = event => { // event prop passed from InputTaskForm component
event.preventDefault(); // prevent form from auto-refreshing on submit
const userInput = event.target.userinput.value // userInput stored
const userInputIsBlank = userInput.trim().length < 1 // trim (remove) prefixed and affixed spaces, then check length
userInputIsBlank
? alert(`Error: invalid submission`)
: this.storeTask(userInput);
};
storeTask = userInput => { // userInput passed from formValidation function
this.setState({
userinput: userInput,
tasksarray: [...this.state.tasksarray, { title: userInput, crossedOut: false } ] //create a copy of tasks array then add a new object into the array filled out with user input
});
document.forms["charlie"].reset();
};
removeTask = (event, index) => { // props passed from DisplayTasks component
event.stopPropagation(); // prevents bubbling to crossOutTask in the DisplayTask component
const removedTaskArray = [...this.state.tasksarray]; //removedTaskArray is just a copy of our current array for the moment
removedTaskArray.splice(index, 1); //here removedTaskArray actually becomes an array w/ the removed task (removed with splice)
this.setState({ tasksarray: removedTaskArray });
};
crossOutTask = index => { // index prop passed from DisplayTasks component
const { tasksarray } = this.state
const selected = tasksarray[index];
this.setState({
tasksarray: [ // change tasksarray state to: [prior slice, change, after slice]
...tasksarray.slice(0, index), // slice off (copies) of array elements prior to index element
Object.assign(selected, {crossedOut: !selected.crossedOut}), // invert the selected line's crossedOut value
...tasksarray.slice(index + 1) // slice off (copies) of array elements after index element
]
});
};
componentDidUpdate() {
console.log(this.state.tasksarray); // debugging :)
};
/* =============================================== #RENDER ================================================
=========================================================================================================== */
render() {
const { tasksarray } = this.state
const { formValidation, storeTask, removeTask, crossOutTask } = this
return (
<div className="grid-container">
<div className="input-tasks-container box">
<h1 className="title is-4">Todo: </h1>
<InputTaskForm
task={storeTask}
formValidation={formValidation} />
</div>
<div className="tasks-grid-container">
<h1 className="Tasks-title title is-4">Tasks</h1>
<h1 className="Tasks-title subtitle is-6">Tip: click on a task to mark it as done</h1>
<DisplayTasks
tasksArray={tasksarray}
removeTask={removeTask}
crossOutTask={crossOutTask} />
</div>
</div>
);
};
};
/* ================================================ #EXPORT ===============================================
=========================================================================================================== */
export default App;
App.css
/* Prevent highlighting when double clicking list items */
#orderedList {
-webkit-user-select: none; /* Chrome all / Safari all */
-moz-user-select: none; /* Firefox all */
-ms-user-select: none; /* IE 10+ */
user-select: none; /* Likely future */
cursor: pointer;
}
.grid-container {
display: grid;
grid-template-columns: 1fr 1fr 425px 1fr 1fr;
grid-template-rows: 200px 1fr;
}
.input-tasks-container {
margin-top: 45px;
text-align: center;
display: grid;
grid-column-start: 3;
}
.Tasks-title {
margin-top: 20px;
}
.tasks-grid-container {
display: grid;
grid-row-start: 2;
grid-column-start: 3;
grid-column-end: 5;
}
.removeButton {
margin-left: 10px
}
button {
cursor: pointer;
}
.charlie {
margin-bottom: 20px;
}
li {
margin-bottom: 10px;
}
ol {
margin-left: 40px;
}
So setting styles dynamically is easy enough, the question I have is based on dynamic styles within a Media Query, so between max-width: 1000px I want the styling to be something based on a property or some calculated JS like the total width of a carousel by the amount of components.
Anyway here is a code snippet of something that doesn't work but shows how my thinking about how I HOPED the properties could be applied :-P
<link rel="import" href="../../bower_components/polymer/polymer-element.html">
<dom-module id="hello-eggs">
<template>
<style>
:host {
display: block;
background: [[prop2]];
}
#media screen and (max-width: 1000px) {
background: [[prop2]]
}
</style>
<span>[[prop1]] are here</span>
</template>
<script>
/**
* #customElement
* #polymer
*/
class HelloEggs extends Polymer.Element {
static get is() { return 'hello-eggs'; }
static get properties() {
return {
prop1: {
type: String,
value: 'Hello Eggs'
},
prop2: {
type: String,
value: '#fc0'
}
};
}
}
window.customElements.define(HelloEggs.is, HelloEggs);
</script>
</dom-module>
Thank you in advance
It's okay I figured out a way that makes me happy and hopefully helps other people like myself :-D
Basically I get the stylesheet and insert a rule for a new Media Query which lets me set what I want. I also changed the width to 500px
<link rel="import" href="../../bower_components/polymer/polymer-element.html">
<dom-module id="hello-eggs">
<template>
<style>
:host {
display: block;
background: #eee;
margin-bottom: 10px;
}
</style>
<span>[[prop1]] are here</span>
</template>
<script>
/**
* #customElement
* #polymer
*/
class HelloEggs extends Polymer.Element {
static get is() { return 'hello-eggs'; }
static get properties() {
return {
prop1: {
type: String,
value: 'Hello Eggs'
},
prop2: {
type: String,
value: '#fc0'
}
};
}
connectedCallback() {
super.connectedCallback();
let sheet = this.shadowRoot.styleSheets[0];
sheet.insertRule(`#media screen and (max-width: 500px) { span { background: ${this.prop2}; } }`, 1);
}
}
window.customElements.define(HelloEggs.is, HelloEggs);
</script>
</dom-module>
I still think it would be great to be able to put properties in styles area for extreme cases, but this still gives me this if I have all the styles applied with insertRule which is great for widths and heights etc.
Is it possible to add the dynamic variable in style?
I mean something like:
<style>
.class_name {
background-image({{project.background}});
}
#media all and (-webkit-min-device-pixel-ratio : 1.5),
all and (-o-min-device-pixel-ratio: 3/2),
all and (min--moz-device-pixel-ratio: 1.5),
all and (min-device-pixel-ratio: 1.5) {
.class_name {
background-image({{project.background_retina}});
}
}
</style>
I faced the same problem. I have been trying to use a background color value from a database. I find out a good solution to add a background color value on inline CSS which value I set from database.
<img :src="/Imagesource.jpg" alt="" :style="{'background-color':Your_Variable_Name}">
With Vue.js 3.2 you can do State-Driven Dynamic CSS like this:
<template>
<h1 id="script">Script</h1>
<h1 id="scriptSetup">Script setup</h1>
</template>
<script>
export default {
data() {
return {
colorFromScript: 'red'
}
}
}
</script>
<script setup>
const colorFromScriptSetup = 'green'
</script>
<style>
#script {
color: v-bind('colorFromScript')
}
#scriptSetup {
color: v-bind('colorFromScriptSetup')
}
</style>
See an implementation here
The best way to include dynamic styles is to use CSS variables. To avoid inline styles while gaining the benefit (or necessity—e.g., user-defined colors within a data payload) of dynamic styling, use a <style> tag inside of the <template> (so that values can be inserted by Vue). Use a :root pseudo-class to contain the variables so that they are accessible across the CSS scope of the application.
Note that some CSS values, like url() cannot be interpolated, so they need to be complete variables.
Example (Nuxt .vue with ES6/ES2015 syntax):
<template>
<div>
<style>
:root {
--accent-color: {{ accentColor }};
--hero-image: url('{{ heroImage }}');
}
</style>
<div class="punchy">
<h1>Pow.</h1>
</div>
</div>
</template>
<script>
export default {
data() { return {
accentColor: '#f00',
heroImage: 'https://vuejs.org/images/logo.png',
}},
}
</script>
<style>
.punchy {
background-image: var(--hero-image);
border: 4px solid var(--accent-color);
display: inline-block;
width: 250px; height: 250px;
}
h1 {
color: var(--accent-color);
}
</style>
Also created an alternate more involved runnable example on Codepen.
CSS <style> is static. I don't think you can do that... you might have to look for a different approach.
You can try using CSS variables. For example, (the code below is not tested)
<template>
<div class="class_name" :style="{'--bkgImage': 'url(' + project.background + ')', '--bkgImageMobile': 'url(' + project.backgroundRetina + ')'}">
</div>
</template>
<style>
.class_name{
background-image: var(--bkgImage);
}
#media all and (-webkit-min-device-pixel-ratio : 1.5),
all and (-o-min-device-pixel-ratio: 3/2),
all and (min--moz-device-pixel-ratio: 1.5),
all and (min-device-pixel-ratio: 1.5) {
.class_name {
background-image: var(--bkgImageMobile);
}
}
</style>
Note: Only the latest browsers support CSS variables.
If you still see any issues with the :style in the template then try this,
<div :style="'--bkgImage: url(' + project.background + '); --bkgImageMobile: url(' + project.backgroundRetina + ')'">
</div>
As you are using Vue.js, use Vue.js to change the background, instead of CSS:
var vm = new Vue({
el: '#vue-instance',
data: {
rows: [
{value: 'green'},
{value: 'red'},
{value: 'blue'},
],
item:""
},
methods:{
onTimeSlotClick: function(item){
console.log(item);
document.querySelector(".dynamic").style.background = item;
}
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/1.0.16/vue.js"></script>
<div id="vue-instance">
<select class="form-control" v-model="item" v-on:change="onTimeSlotClick(item)">
<option value="">Select</option>
<option v-for="row in rows">
{{row.value}}
</option>
</select>
<div class='dynamic'>VALUE</div>
<br/><br/>
<div :style="{ background: item}">Another</div>
</div>
Yes, this is possible. Vue.js does not support style tags in templates, but you can get around this by using a component tag. Untested pseudocode:
In your template:
<component type="style" v-html="style"></component>
In your script:
props: {
color: String
}
computed: {
style() {
return `.myJSGeneratedStyle { color: ${this.color} }`;
}
}
There are lots of reasons why you shouldn't use this method. It's definitely hacky and :style="" is probably better most of the time, but for your problem with media queries I think this is a good solution.
Vue 3 State-Driven Dynamic CSS Variables
I know this is a bit late and is using Vue.js 2, but as of now in Vue.js 3 you can create state-driven CSS variables.
You can now use your SFC (Single File Component) state data inside your styles tags using v-bind().
You can read more about state-driven CSS variables here, or read the Vue.js 3 documentation here.
Here is a code example
Example
<template>
<div>
<input type="text" v-model="color" />
<div class="user-input-color">
{{ color }}
</div>
</div>
</template>
<script>
export default {
data: () => ({
color: 'white'
})
}
</script>
<style scoped>
.user-input-color {
background-color: v-bind(color)
}
</style>
Here is a link to the live example.
Links
JS Now Vue state-driven CSS variables
Vue.js 3 Docs
Live Example
You can use the component tag offered by Vue.js.
<template>
<component :is="`style`">
.cg {color: {{color}};}
</component>
<p class="cg">I am green</p> <br/>
<button #click="change">change</button>
</template>
<script>
export default {
data(){
return { color: 'green' }
},
methods: {
change() {this.color = 'red';}
}
}
</script>
I encountered the same problem and I figured out a hack which suits my needs (and maybe yours).
As <style> is contained in <head>, there is a way to make it work:
We generate the CSS content as a computed property based on the state of the page/component
computed: {
css() {
return `<style type="text/css">
.bg {
background: ${this.bg_color_string};
}</style>`
}
}
Now, we have our style as a string and the only challenge is to pass it to the browser.
I added this to my <head>
<style id="customStyle"></style>
Then I call the setInterval once the page is loaded.
mounted() {
setInterval(() => this.refreshHead(), 1000);
}
And I define the refreshHead as such:
methods: {
refreshHead() {
document.getElementById('customStyle').innerHTML = this.css
}
}
In simple terms, this is how you would do it in Vue.js and Nuxt.js:
<template>
<div>
<img :src="dynamicImageURL" alt="" :style="'background-color':backgroundColor"/>
</div>
</template>
<script>
export default{
data(){
return {
dynamicImageURL='myimage.png',
backgroundColor='red',
}
}
}
</script>
I needed to write completely dynamic styles, so I used approach beyond Vue system:
{
// Other properties.
watch: {
myProp: {
handler() {
this.styleElement.innerHTML = this.myProp.css;
},
deep: true,
},
},
mounted() {
this.styleElement = this.document.createElement('style');
this.styleElement.innerText = this.myProp.css;
this.document.head.append(this.styleElement);
},
unmounted() {
this.styleElement.remove();
},
}
Though it may have some performace issues with CSS big enough.
I liked #mickey-mullin reply, but not everything worked entirely. The url missed require, even though the information in his post helped me a lot in my case.
var(), url(), multiple ternary operators (my own case - you shouldn't need it), I was able to do so for background-image in such a way:
template
<div :style="[
case1 ? { '--iconUrl': `url(${require('../../../public/icon1.svg')})`} :
case2 ? { '--iconUrl': `url(${require('../../../public/icon2.svg')})`} :
{ '--iconUrl': `url(${require('../../../public/default.svg')})` },
]" class="myClass">
styles
div.myClass::before {
background-image: var(--iconUrl);
}
Note: I didn't have to declare iconUrl in my data() -> return.
Angular JS code I am working on has media queries that can be used to limit the display of blocks with code like this:
#media screen and (max-width: 370px) {
#testGrid {
.gridHeader {
div:nth-child(2),
div:nth-child(3),
div:nth-child(n+7) {
display: none;
}
div:nth-child(6) {
border-top-right-radius: 0.4rem;
}
}
.gridBody {
div {
div:nth-child(2),
div:nth-child(3),
div:nth-child(n+7) {
display: none;
}
}
}
}
}
My comment here was that it's not good to use things like div:nth-child(2) as this would easily break if another column was added. Plus it's also difficult to maintain. I suggested to give the column names class names that matched the contents of the columns.
Still this means that I have the code that defines what shows and what does not show far removed from the HTML. Does anyone have any suggestions on a way that I could do this with AngularJS that would have the showing and hiding of columns next to the actual <div>s
You can get the current width from the $window service so you could try something like this:
DEMO
app.controller('MainCtrl', function($scope, $window) {
$scope.name = 'World';
angular.element($window).bind('resize', function(){
$scope.hideThing = ($window.innerWidth < 400);
// have to manually update $scope as angular won't know about the resize event
$scope.$digest();
});
});
Then in your HTML
<body ng-controller="MainCtrl">
<p ng-hide="hideThing" >Hello {{name}}!</p>
</body>