Using a Bootstrap5 toggle switch (which is basically just a checkbox) to toggle on and off lines in a grid. I have it set up so if the toggle is true then add the class which adds lines for the grid and if it's false then remove class and the lines. When I toggle off the class that holds the style for the line gets removed correctly but when I toggle on then the class doesn't come back and toggle the lines on. I am also using a forEach() to loop through all the divs.
I have console.log within and they fire for each toggle so I am not sure what I am missing. Here is the code
JS
let gridToggleSwitch = document.querySelector("#gridToggle")
gridToggleSwitch.addEventListener('change', () => {
let boxList = document.querySelectorAll('.box')
let toggleChoice = gridToggleSwitch.checked
if(toggleChoice == true) {
console.log("LINES")
boxList.forEach((e) => {
console.log(e)
e.classList.add('box')
})
} else if (toggleChoice == false) {
console.log('NO LINES')
boxList.forEach((e) => {
console.log(e)
e.classList.remove('box')
})
} else {
console.log('woops')
}
})
CSS:
.box {
border: 1px solid black;
}
SOLVED:
since the grid can change dynamically I needed to also dynamically add an ID to the divs for the grid and instead of using the forEach() for the classes I looped through the ID and added/removed the border style
I'm trying to use Svelte to do some conditional styling and highlighting to equations. While I've been successful at applying a global static style to a class, I cannot figure out how to do this when an event occurs (like one instance of the class is hovered over).
Do I need to create a stored value (i.e. some boolean that gets set to true when a class is hovered over) to use conditional styling? Or can I write a function as in the example below that will target all instances of the class? I'm a bit unclear why targeting a class in styling requires the :global(classname) format.
App.svelte
<script>
// import Component
import Katex from "./Katex.svelte"
// math equations
const math1 = "a\\htmlClass{test}{x}^2+bx+c=0";
const math2 = "x=-\\frac{-b\\pm\\sqrt{b^2-4ac}}{2a}";
const math3 = "V=\\frac{1}{3}\\pi r^2 h";
// set up array and index for reactivity and initialize
const mathArray = [math1, math2, math3];
let index = 0;
$: math = mathArray[index];
// changeMath function for button click
function changeMath() {
// increase index
index = (index+1)%3;
}
function hoverByClass(classname,colorover,colorout="transparent")
{
var elms=document.getElementsByClassName(classname);
console.log(elms);
for(var i=0;i<elms.length;i++)
{
elms[i].onmouseover = function()
{
for(var k=0;k<elms.length;k++)
{
elms[k].style.backgroundColor=colorover;
}
};
elms[i].onmouseout = function()
{
for(var k=0;k<elms.length;k++)
{
elms[k].style.backgroundColor=colorout;
}
};
}
}
hoverByClass("test","pink");
</script>
<h1>KaTeX svelte component demo</h1>
<h2>Inline math</h2>
Our math equation: <Katex {math}/> and it is inline.
<h2>Displayed math</h2>
Our math equation: <Katex {math} displayMode/> and it is displayed.
<h2>Reactivity</h2>
<button on:click={changeMath}>
Displaying equation {index}
</button>
<h2>Static math expression within HTML</h2>
<Katex math={"V=\\pi\\textrm{ m}^3"}/>
<style>
:global(.test) {
color: red
}
</style>
Katex.svelte
<script>
import katex from "katex";
export let math;
export let displayMode = false;
const options = {
displayMode: displayMode,
throwOnError: false,
trust: true
}
$: katexString = katex.renderToString(math, options);
</script>
<svelte:head>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/katex#0.12.0/dist/katex.min.css" integrity="sha384-AfEj0r4/OFrOo5t7NnNe46zW/tFgW6x/bCJG8FqQCEo3+Aro6EYUG4+cU+KJWu/X" crossorigin="anonymous">
</svelte:head>
{#html katexString}
If I understand it correctly you have a DOM structure with arbitrary nested elements and you would want to highlight parts of the structure that share the same class.
So you would have a structure like this:
<div>
<p>This is some text <span class="a">highlight</span></p>
<span class="a">Another highlight</span>
<ul>
<li>Some listitem</li>
<li class="a">Some listitem</li>
<li class="b">Some listitem</li>
<li class="b">Some listitem</li>
</ul>
</div>
And if you select an element with class="a" all elements should be highlighted regardles where they are in the document. This arbitrary placement makes using the sibling selector in css not possible.
There is no easy solution to this, but I will give you my attempt:
This is the full code with some explanation
<script>
import { onMount } from 'svelte'
let hash = {}
let wrapper
onMount(() => {
[...wrapper.querySelectorAll('[class]')].forEach(el => {
if (hash[el.className]) return
else hash[el.className] = [...wrapper.querySelectorAll(`[class="${el.className}"]`)]
})
Object.values(hash).forEach(nodes => {
nodes.forEach(node => {
node.addEventListener('mouseover', () => nodes.forEach(n => n.classList.add('hovered')))
node.addEventListener('mouseout', () => nodes.forEach(n => n.classList.remove('hovered')))
})
})
})
</script>
<div bind:this={wrapper}>
<p>
Blablabla <span class="a">AAA</span>
</p>
<span class="a">BBBB</span>
<ul>
<li>BBB</li>
<li class="a b">BBB</li>
<li class="b">BBB</li>
<li class="b">BBB</li>
</ul>
</div>
<style>
div :global(.hovered) {
background-color: red;
}
</style>
The first thing I did was use bind:this to get the wrapping element (in your case you would put this around the {#html katexString}, this will make that the highlight is only applied to this specific subtree.
Doing a querySelector is a complex operation, so we will gather all the related nodes in a sort of hashtable during onMount (this kind of assumes the content will never change, but since it's rendered with #html I believe it's safe to do so).
As you can see in onMount, I am using the wrapper element to restrict the selector to this section of the page, which is a lot faster than checking the entire document and is probably what you want anyway.
I wasn't entirely sure what you want to do, but for simplicity I am just grabbing every descendant that has a class and make a hash section for each class. If you only want certain classes you could write out a bunch of selectors here instead:
hash['selector-1'] = wrapper.querySelectorAll('.selector-1');
hash['selector-2'] = wrapper.querySelectorAll('.selector-2')];
hash['selector-3'] = wrapper.querySelectorAll('.selector-3');
Once this hashtable is created, we can loop over each selector, and attach two event listeners to all of the elements for that selector. One mouseover event that will then again apply a new class to each of it's mates. And a mouseout that removes this class again.
This still means you have to add hovered class. Since the class is not used in the markup it will be removed by Svelte unless you use :global() as you found out yourself. It is indeed not that good to have global classes because you might have unintended effect elsewhere in your code, but you can however scope it as I did in the code above.
The line
div > :global(.hovered) { background-color: red; }
will be processed into
div.svelte-12345 .hovered { background-color: red; }
So the red background will only be applied to .hovered elements that are inside this specific div, without leaking all over the codebase.
Demo on REPL
Here is the same adapted to use your code and to use a document-wide querySelector instead (you could probably still restrict if wanted by having the bind one level higher and pass this node into the component)
Other demo on REPL
Hello using a table kind of like this
https://jsfiddle.net/vw19pbfo/24/
how could i make a trigger onClick that removes borders on first click and on second click add them back but that should only happen on the row that is being clicked on and not affect the other. I have tried to have a conditional css on the first and last <td> but that affected every border but i only want to affect the clicked one
function removeBorders(e){
var target = e.target || e.srcElement;
target.parentElement.classList.toggle('without-border');
};
Working JSFiddle: https://jsfiddle.net/andrewincontact/su86fhxo/9/
Changes:
1) to css:
.my-table-row.without-border td {
border-top-left-radius: 0;
border-bottom-left-radius: 0;
border-top-right-radius: 0;
border-bottom-right-radius: 0;
}
2) to html:
onclick=removeBorders(event) instead onClick=this.removeBorders()
One way would be to check the <td> element's parent and add/remove a custom class, like so:
function removeBorders(e) {
var row = e.parentElement;
if (row.className.indexOf("has-borders") === -1) {
row.classList.add("has-borders");
} else {
row.classList.remove("has-borders");
}
};
Working JSFiddle: https://jsfiddle.net/d380sjrh/
I also changed onClick=this.removeBorders() to onclick="removeBorders(this);".
JSFiddle: https://jsfiddle.net/4qdstec7/
Use React's state to set and unset the selected class.
const Row = ({ children }) => {
const [selected, setSelected] = useState(false);
const onClick = e => setSelected(!selected);
return (
<tr
className={selected && 'selected'}
onClick={onClick}
>
{children}
</tr>
)
}
Developing in React requires a shift in thinking from traditional web development. Please take some time to read this excellent post from the React team.
I'm using AG Grid on a website. When the user clicks a cell, it is focused and gets a blue outline.
I need to remove this focus when the user clicks certain other elements on the site, but I don't know how to do it. Is there a method or property to set for that?
Add the following snippet to your css
.ag-cell-focus, .ag-cell {
border: none !important;
}
Example - https://next.plnkr.co/edit/xO5N5u84U8n4HgK5
Angular2+ DEMO
ngAfterViewInit(){
let body = document.body;
body.addEventListener("mouseup", (e) => {
let container = this.agGrid._nativeElement;
if (!container.contains(e.target))
{
this.gridApi.clearFocusedCell();
}
})
}
JavaScript DEMO
var body = document.body;
body.addEventListener("mouseup", (e) => {
let gridDiv = document.querySelector('#myGrid')
if (!gridDiv.contains(e.target))
{
gridOptions.api.clearFocusedCell();
}
})
Apple below code to the global style.css file
.ag-cell-focus {
--ag-range-selection-border-color: transparent !important;
}
I have a Vue.js component with several elements in it. I want to automatically scroll to the bottom of that element when a method in the component is called.
Basically, do the same as this. However, I haven't found a way to get the element within my component and modify scrollTop
I'm currently using Vue.js 2.0.8.
2022 easy, readable, smooth scrolling ability, & won't hurt your brain... use el.scrollIntoView()
scrollIntoView() has options you can pass it like scrollIntoView({behavior: 'smooth'}) to get smooth scrolling out of the box and does not require any external libraries.
Here is a fiddle.
methods: {
scrollToElement() {
const el = this.$refs.scrollToMe;
if (el) {
// Use el.scrollIntoView() to instantly scroll to the element
el.scrollIntoView({behavior: 'smooth'});
}
}
}
Then if you wanted to scroll to this element on page load you could call this method like this:
mounted() {
this.scrollToElement();
}
Else if you wanted to scroll to it on a button click or some other action you could call it the same way:
<button #click="scrollToElement">scroll to me</button>
The scroll works all the way down to IE 8. The smooth scroll effect does not work out of the box in IE or Safari. If needed there is a polyfill available for this here as #mostafaznv mentioned in the comments.
As I understand, the desired effect you want is to scroll to the end of a list (or scrollable div) when something happens (e.g.: an item is added to the list). If so, you can scroll to the end of a container element (or even the page it self) using only pure JavaScript and the VueJS selectors.
var container = this.$el.querySelector("#container");
container.scrollTop = container.scrollHeight;
I've provided a working example in this fiddle.
Every time a item is added to the list, the list is scrolled to the end to show the new item.
I tried the accepted solution and it didn't work for me. I use the browser debugger and found out the actual height that should be used is the clientHeight BUT you have to put this into the updated() hook for the whole solution to work.
data(){
return {
conversation: [
{
}
]
},
mounted(){
EventBus.$on('msg-ctr--push-msg-in-conversation', textMsg => {
this.conversation.push(textMsg)
// Didn't work doing scroll here
})
},
updated(){ <=== PUT IT HERE !!
var elem = this.$el
elem.scrollTop = elem.clientHeight;
},
Use the ref attribute on the DOM element for reference
<div class="content scrollable" ref="msgContainer">
<!-- content -->
</div>
You need to setup a WATCH
data() {
return {
count: 5
};
},
watch: {
count: function() {
this.$nextTick(function() {
var container = this.$refs.msgContainer;
container.scrollTop = container.scrollHeight + 120;
});
}
}
Ensure you're using proper CSS
.scrollable {
overflow: hidden;
overflow-y: scroll;
height: calc(100vh - 20px);
}
Here is a simple example using ref to scroll to the bottom of a div.
/*
Defined somewhere:
var vueContent = new Vue({
el: '#vue-content',
...
*/
var messageDisplay = vueContent.$refs.messageDisplay;
messageDisplay.scrollTop = messageDisplay.scrollHeight;
<div id='vue-content'>
<div ref='messageDisplay' id='messages'>
<div v-for="message in messages">
{{ message }}
</div>
</div>
</div>
Notice that by putting ref='messageDisplay' in the HTML, you have access to the element through vueContent.$refs.messageDisplay
If you need to support IE11 and (old) Edge, you can use:
scrollToBottom() {
let element = document.getElementById("yourID");
element.scrollIntoView(false);
}
If you don't need to support IE11, the following will work (clearer code):
scrollToBottom() {
let element = document.getElementById("yourID");
element.scrollIntoView({behavior: "smooth", block: "end"});
}
Try vue-chat-scroll:
Install via npm: npm install --save vue-chat-scroll
Import:
import Vue from 'vue'
import VueChatScroll from 'vue-chat-scroll'
Vue.use(VueChatScroll)
in app.js after window.Vue = require('vue').default;
then use it with :
<ul class="messages" v-chat-scroll>
// your message/chat code...
</ul>
For those that haven't found a working solution above, I believe I have a working one. My specific use case was that I wanted to scroll to the bottom of a specific div - in my case a chatbox - whenever a new message was added to the array.
const container = this.$el.querySelector('#messagesCardContent');
this.$nextTick(() => {
// DOM updated
container.scrollTop = container.scrollHeight;
});
I have to use nextTick as we need to wait for the dom to update from the data change before doing the scroll!
I just put the above code in a watcher for the messages array, like so:
messages: {
handler() {
// this scrolls the messages to the bottom on loading data
const container = this.$el.querySelector('#messagesCard');
this.$nextTick(() => {
// DOM updated
container.scrollTop = container.scrollHeight;
});
},
deep: true,
},
The solution did not work for me but the following code works for me. I am working on dynamic items with class of message-box.
scrollToEnd() {
setTimeout(() => {
this.$el
.getElementsByClassName("message-box")
[
this.$el.getElementsByClassName("message-box").length -
1
].scrollIntoView();
}, 50);
}
Remember to put the method in mounted() not created() and add class message-box to the dynamic item. setTimeout() is essential for this to work. You can refer to https://forum.vuejs.org/t/getelementsbyclassname-and-htmlcollection-within-a-watcher/26478 for more information about this.
This is what worked for me
this.$nextTick(() => {
let scrollHeight = this.$refs.messages.scrollHeight
window.scrollTo(0, scrollHeight)
})
In the related question you posted, we already have a way to achieve that in plain javascript, so we only need to get the js reference to the dom node we want to scroll.
The ref attribute can be used to declare reference to html elements to make them available in vue's component methods.
Or, if the method in the component is a handler for some UI event, and the target is related to the div you want to scroll in space, you can simply pass in the event object along with your wanted arguments, and do the scroll like scroll(event.target.nextSibling).
I had the same need in my app (with complex nested components structure) and I unfortunately did not succeed to make it work.
Finally I used vue-scrollto that works fine !
My solutions without modules:
Template
<div class="scrollable-content" ref="conversations" />
Script
scrollToBottom() {
const container = this.$refs.conversations;
container.scrollTop = container.scrollHeight;
},
scrollToBottom() {
this.$nextTick(function () {
let BoxEl = document.querySelector('#Box');
if(BoxEl)
BoxEl.scrollTop = BoxEl.scrollHeight;
});
}
Agree with Lurein Perera
Just want to add extra info
watch: {
arrayName: {
handler() {
const container = this.$el.querySelector("#idName");
this.$nextTick(() => {
container.scrollTop = container.scrollHeight;
});
},
deep: true,
},
},
Where as:
arrayName = Name of array
idName = The id attribute has to be added to the div where you want the scrollbar to auto-scroll down when arrayName length increases.
scrollToElement() {
const element = this.$refs.abc; // here abc is the ref of the element
if (element) {
el.scrollIntoView({behavior: 'smooth'});
}
}
}
here you need to use ref for the particular div or element which you want make visible on scroll.
if you have a table and you want to locate the last row of the table then you have to use -
element.lastElementChild.scrollIntoView({behaviour:'smooth'})
Here not that if you ware asynchronously adding the element to the table then you have to take care of it. you can test it using setTimeout, if that is making any difference.
e.g.
const element = this.$refs.abc;
if (element) {
setTimeout(() => {
element.lastElementChild.scrollIntoView({behaviour:'smooth'})
}, 1000);
}
}
replace set timeout with your own async logic.
Using Composition API and TypeScript
I set the parameter scrollTop equal to scrollHeightfrom the HTMLDivElment API.
<template>
<div id="container" ref="comments">
Content ...
</div>
</template>
<script lang="ts">
import { defineComponent, ref, Ref, watchEffect } from 'vue'
export default defineComponent({
setup() {
const comments: Ref<null | HTMLDivElement> = ref(null)
watchEffect(() => {
if(comments.value) {
comments.value.scrollTop = comments.value.scrollHeight
}
})
return {
comments
}
}
})
</script>