Develop Reference

How to set textarea height using min-height?

I am trying to create a message input field, using textarea. The reason I am using textarea is to be able to dynamically change the height.
To be able to dynamically change the height of the textarea and the parent divs, I have implemented this code.
The code works, just fine. To be able to use this JavaScript code I have to use min-height on the textarea. The problem is that I want to set the height of the textarea to 10px but it simply doesn't want to work, when using min-height. I does somehow work when I use height, but then the JavaScript won't work.
UPDATE:
I am just trying to create a field where the user can write a message and then post it.
Currently the textarea is too tall in my opinion, there is no reason for it to be taller than needed. So i want the height to initially be 20px, and then be able to expand as the user types.
UPDATE UPDATE:
I want to know how to set the height of the textarea to 10px or 20px, but still be able to dynamically change the height when the user types, using the javascript code i have provided
Any ideas on how to solve this? Btw, I'm not very well versed in CSS.
var areaName = "finder__input";
var textarea = document.getElementById(areaName);
textarea.addEventListener("input", function() {
const textarea = document.querySelector("textarea");
const textareaHeight = textarea.clientHeight;
textarea.style.height = "auto";
textarea.style.height = textarea.scrollHeight + "px";
});
body {
color: #292929;
background-color: #616f91
}
.container {
display: flex;
flex-direction: row;
justify-content: center;
position: absolute;
bottom: 0;
left: 0;
right: 0;
padding-bottom: 100px;
}
.finder {
border: 1px solid #fff;
background-color: #f6f5f0;
border-radius: 5px;
/* width: 722px; */
padding: 3px;
box-shadow: 2px 2px 1px black, -1px -1px 1px white;
}
.finder__outer {
position: relative;
/* width: 700px; */
border-radius: 5px;
min-height: 1px;
padding: 8px;
background-color: transparent;
box-shadow: inset 2px 2px 5px -2px black, inset -10px -10px 5px -7px white;
}
.finder__input {
border: none;
resize: none;
background-color: red;
outline: none;
font-size: 15px;
letter-spacing: 1px;
width: 100%;
font-weight: bold;
min-height: 10px;
max-height: 90px;
}
<div class="container">
<div class="finder">
<div class="finder__outer" id="finder__outer">
<textarea id="finder__input" class="finder__input" type="text" name="q" placeholder="Write a message..."></textarea>
</div>
</div>
</div>

Resize textarea height on input
This is basically similar to this jQuery related question: Resize Textarea on Input.
Here's a rewrite in vanilla JavaScript
const textareaResize = (elTextarea) => {
elTextarea.style.height = "auto";
const h = elTextarea.scrollHeight;
elTextarea.style.height = `${h}px`;
};
document.querySelectorAll(".flexheight").forEach((elTextarea) => {
elTextarea.addEventListener("input", textareaResize); // on input
textareaResize(elTextarea); // on init
});
textarea.flexheight {
resize: none;
width: 100%;
box-sizing: border-box;
font: inherit;
height: 1rem;
}
Starts small and increment height as user types: <br>
<textarea class="flexheight" placeholder="Write a message..."></textarea>
<br>
<textarea class="flexheight" placeholder="Write about yourself..."></textarea>

var areaName = "finder__input";
var textarea = document.getElementById(areaName);
textarea.addEventListener("input", function() {
const textarea = document.querySelector("textarea");
const textareaHeight = textarea.clientHeight;
//textarea.style.height = "10px";
textarea.style.minHeight = textarea.scrollHeight + "px";
});
try using minHeight

upload button multiple - file lists in new line (break line) :)

What's Up :)
I styled custom upload file button, it looks like i want, but i don't know how to make it in .js that - each file name will be shown in new line not like right now after "," - i saw in .js code - line: .join(", ") but i don't know how to replace it with code which will make those files names into new lines :(
Here's my code:
HTML:
<div>
<input class="file-upload__input" type="file" name="myFile[]" id="myFile" multiple>
<button class="file-upload__button" type="button">Choose File(s)</button>
<span class="file-upload__label"></span>
</div>
</div>
CSS:
display: inline-flex;
align-items: center;
font-size: 15px;
}
.file-upload__input {
display: none;
}
.file-upload__button {
-webkit-appearance: none;
background: #009879;
border: 2px solid #00745d;
border-radius: 4px;
outline: none;
padding: 0.5em 0.8em;
margin-right: 15px;
color: #ffffff;
font-size: 1em;
font-family: "Quicksand", sans-serif;
font-weight: bold;
cursor: pointer;
}
.file-upload__button:active {
background: #00745d;
}
.file-upload__label {
max-width: 250px;
font-size: 0.95em;
text-overflow: ellipsis;
overflow: hidden;
white-space: nowrap;
font-family: "Quicksand", sans-serif;
display: block;
margin-top: 15px;
}
.JS
document.querySelectorAll(".file-upload__button"),
function(button) {
const hiddenInput = button.parentElement.querySelector(
".file-upload__input"
);
const label = button.parentElement.querySelector(".file-upload__label");
const defaultLabelText = "No file(s) selected";
// Set default text for label
label.textContent = defaultLabelText;
label.title = defaultLabelText;
button.addEventListener("click", function() {
hiddenInput.click();
});
hiddenInput.addEventListener("change", function() {
const filenameList = Array.prototype.map.call(hiddenInput.files, function(
file
) {
return file.name;
});
label.textContent = filenameList.join(", ") || defaultLabelText;
label.title = label.textContent;
});
}
);
Thanks everyone who will help <3

I'm adding this as an answer instead of a comment so there is an official answer to this question.
Simply swap this
label.textContent = filenameList.join(", ") || defaultLabelText;
with this instead
label.innerHTML = filenameList.join("<br>") || defaultLabelText;

When to Call JavaScript Toggle Function?

I have a drop down menu I need to make appear and disappear using pure JavaScript (no libraries/jQuery). Thus I am developing a toggle function. However despite trying several approaches, nothing seems to work. My current idea is to create a variable to hold the state of the menu (open or closed). Once the display of the menu changes from "none" to "block", the variable should change from "closed" to "open". Then an event listener would be added to the body element so when anything is clicked, the menu closes (i.e. the display property is changed back to "none").
Unfortunately the above doesn't seem work. When I put the If/else block outside of an event listener it fires when the page loads, but not when the menuToggle variable changes. If I put it or a function inside the menuPlaceholder event listener the menu won't open, probably due to the open and close code being called basically at the same time.
Clearly I am missing something, probably related to program control or function calling. Does anyone have any insights?
The code I am working with is below. Note the alert functions peppered throughout the code are for testing purposes only.
//Puts IDs for search preference selection box into variables
var menuPlaceholder = document.getElementById('searchSelection');
var menuDisplay = document.getElementById('searchOptions');
var boxLabel = document.getElementById('searchLabel');
//Puts IDs for text input box and submission into variables
var searchBoxPlaceholder = document.getElementById('searchInput');
var searchInput = document.getElementById('searchBox');
var submitButton = document.getElementById('submit');
//Adds class to each search option and puts ID of hidde field into variable
var searchPrefSubmission = document.getElementsByClassName('buttonSearch');
var hiddenInput = document.getElementById('searchChoice');
//Global variable to indicate whether searchOptions menu is opened or closed
var menuToggle = "closed";
//Closes element when one clicks outside of it.
function hideOnClickOutside(element) {
const outsideClickListener = event => {
if (!element.contains(event.target) && isVisible(element)) { // or use: event.target.closest(selector) === null
element.style.display = 'none'
removeClickListener()
}
}
const removeClickListener = () => {
document.removeEventListener('click', outsideClickListener)
}
document.addEventListener('click', outsideClickListener)
}
const isVisible = elem => !!elem && !!( elem.offsetWidth || elem.offsetHeight || elem.getClientRects().length )
//When the placeholder box is clicked, the option menu appears
menuPlaceholder.addEventListener('click', function (event){
menuDisplay.style.display = "block";
menuToggle = "open";
//Add click event to searchPref buttons
for (i = 0; i < searchPrefSubmission.length; i++) {
//Assigns value of the button to both the hidden input field and the placeholder box
searchPrefSubmission[i].addEventListener('click', function(event) {
hiddenInput.value=this.value;
boxLabel.innerHTML = this.value;
menuDisplay.style.display = "none";
menuPlaceholder.style.display = "inline-block";
});
}
});
//This code causes the text input box of the search form to appear when the background box is clicked
searchBoxPlaceholder.addEventListener('click', function(event){
searchInput.style.display = "inline";
submitButton.style.display = "inline";
//hideOnClickOutside(menuDisplay);
});
if (menuToggle == "open"){
document.body.addEventListener('click', function(event){
alert('Foo!');
})
}else{
alert('Boo!');
}
/*function toggleMenu () {
//menuDisplay.style.display = "none";
alert('Boo!');
menuToggle = "closed";
}*/
body {
font-family:Montserrat, sans-serif;
}
#searchOptionPlaceholder {
display: inline-block;
}
#searchSelection {
padding: 10px 20px;
margin-right: 10px;
background-color: #F0F3F5;
display: inline-block;
color: #000000;
width: 140px;
max-width: 200px;
max-height: 35px;
border: 2px solid black;
vertical-align: middle;
}
#searchSelection img {
float: right;
}
#searchLabel {
display: inline-block;
padding-top: 10px;
vertical-align: top;
}
#searchOptions {
display: none;
background-color: #F0F3F5;
position: absolute;
z-index: 2;
}
#searchOptions ul {
background-color: #F0F3F5;
padding: 5px;
}
#searchOptions li {
list-style-type: none;
border-bottom: 2px solid black;
}
#searchOptions li:hover {
background-color: #706868;
color: #ffffff;
}
.buttonSearch {
background-color: transparent;
border: none;
padding: 10px;
font-size: 14px;
}
.searchSubHeading {
font-size: 12px;
}
#searchInput {
display: inline-block;
background-color: #F0F3F5;
padding: 10px 100px;
position: relative;
top: 0px;
max-width: 350px;
border: 2px solid black;
vertical-align: middle;
}
#searchInput img {
position: relative;
left: 80px;
}
#searchBox {
display: none;
width: 80%;
background-color: #F0F3F5;
border: none;
font-size: 1.5em;
position: relative;
right: 50px;
vertical-align: middle;
}
#submit {
border: none;
background-image: url('https://library.domains.skidmore.edu/search/magnifyingGlass.png');
background-repeat: no-repeat;
background-size: contain;
width: 50px;
height: 30px;
position: relative;
right: -80px;
vertical-align: middle;
}
#otherLinks {
margin-top: 10px;
}
#otherLinks a{
color: #000000;
}
#otherLinks a:hover{
color: #006a52;
}
<h1>Library Search</h1>
<form method="post" action="https://library.domains.skidmore.edu/search/searchBox.php" id="librarySearch">
<div id="searchSelection"><span id="searchLabel">Catalog</span><img src="down.png" height="30px" width="30px" /></div>
<div id="searchOptions">
<ul>
<li><button type="button" name="searchPref" value="Catalog" class="buttonSearch">Catalog<br /><br /><span class="searchSubHeading">Search books and DVDs</span></button></li>
<li><button type="button" name="searchPref" value="SearchMore" class="buttonSearch">SearchMore<br /><br /><span class="searchSubHeading">Search everything</span></button></li>
<li><button type="button" name="searchPref" value="Journals" class="buttonSearch">Journals<br /><br /><span class="searchSubHeading">Search journals</span></button></li>
</ul>
</div>
<div id="searchInput">
<input type="hidden" id="searchChoice" name="searchPref" value="catalog" />
<input type="search" id="searchBox" size="60" name="searchText" placeholder="Search our holdings"/><button type="submit" id="submit"></button></div>
<div id="otherLinks">Advanced Catalog Search | WorldCat | eBooks</div>
</form>

Some issues:
Adding event listeners within an event listener is in most cases a code smell: this will add those inner listeners each time the outer event is triggered. Those listeners remain attached, and so they accumulate. So, attach all event handlers in the top-level script, i.e. on page load, and then never again.
The if ... else at the end will execute on page load, and then never again. So the value of menuToggle is guaranteed to be "closed". You need to put that if...else switch inside the handler, so that it executes every time the event triggers, at which time the menuToggle variable will possibly have a modified value.
The body element does not stretch (by default) over the whole window. If you want to detect a click anywhere on the page, you should attach the listener on the document element itself, not on document.body.
When the click on the menu placeholder is handled, you should avoid that this event "bubbles" up the DOM tree up to the document, because there you have the other handler that wants to hide the menu again. You can do this with event.stopPropagation().
The global variable is not absolutely necessary, but if you use it, then I would call it menuVisible and give it a boolean value: false at first, and possibly true later.
For actually toggling the menu, I would create a function, which takes the desired visibility (false or true) as argument, and then performs the toggle.
Do not use undeclared variables, like the for loop variable i. Define it with let.
Here is your code with those changes implemented. Of course, there is still a lot that could be improved, but I believe that goes beyond the scope of this question:
var menuPlaceholder = document.getElementById('searchSelection');
var menuDisplay = document.getElementById('searchOptions');
var boxLabel = document.getElementById('searchLabel');
var searchBoxPlaceholder = document.getElementById('searchInput');
var searchInput = document.getElementById('searchBox');
var submitButton = document.getElementById('submit');
var searchPrefSubmission = document.getElementsByClassName('buttonSearch');
var hiddenInput = document.getElementById('searchChoice');
// Changed name and type of global variable:
var menuVisible = false;
// Removed some functions ...
menuPlaceholder.addEventListener('click', function (event){
// Use new function for actually setting the visibility
toggleMenu(!menuVisible);
// Avoid that click event bubbles up to the document level
event.stopPropagation();
});
// Add these event handlers on page load, not within another handler
// Define loop variable with let
for (let i = 0; i < searchPrefSubmission.length; i++) {
//Assigns value of the button to both the hidden input field and the placeholder box
searchPrefSubmission[i].addEventListener('click', function(event) {
hiddenInput.value = this.value;
boxLabel.innerHTML = this.value;
// Use the new function for setting the visibility
toggleMenu(false);
menuPlaceholder.style.display = "inline-block";
});
}
searchBoxPlaceholder.addEventListener('click', function(event){
searchInput.style.display = "inline";
submitButton.style.display = "inline";
});
// Bind handler on document itself, and call new function
document.addEventListener('click', function(event) {
toggleMenu(false);
});
// new function to perform the toggle
function toggleMenu(show) {
menuDisplay.style.display = show ? "block" : "none";
menuVisible = show;
}
body {
font-family:Montserrat, sans-serif;
}
#searchOptionPlaceholder {
display: inline-block;
}
#searchSelection {
padding: 10px 20px;
margin-right: 10px;
background-color: #F0F3F5;
display: inline-block;
color: #000000;
width: 140px;
max-width: 200px;
max-height: 35px;
border: 2px solid black;
vertical-align: middle;
}
#searchSelection img {
float: right;
}
#searchLabel {
display: inline-block;
padding-top: 10px;
vertical-align: top;
}
#searchOptions {
display: none;
background-color: #F0F3F5;
position: absolute;
z-index: 2;
}
#searchOptions ul {
background-color: #F0F3F5;
padding: 5px;
}
#searchOptions li {
list-style-type: none;
border-bottom: 2px solid black;
}
#searchOptions li:hover {
background-color: #706868;
color: #ffffff;
}
.buttonSearch {
background-color: transparent;
border: none;
padding: 10px;
font-size: 14px;
}
.searchSubHeading {
font-size: 12px;
}
#searchInput {
display: inline-block;
background-color: #F0F3F5;
padding: 10px 100px;
position: relative;
top: 0px;
max-width: 350px;
border: 2px solid black;
vertical-align: middle;
}
#searchInput img {
position: relative;
left: 80px;
}
#searchBox {
display: none;
width: 80%;
background-color: #F0F3F5;
border: none;
font-size: 1.5em;
position: relative;
right: 50px;
vertical-align: middle;
}
#submit {
border: none;
background-image: url('https://library.domains.skidmore.edu/search/magnifyingGlass.png');
background-repeat: no-repeat;
background-size: contain;
width: 50px;
height: 30px;
position: relative;
right: -80px;
vertical-align: middle;
}
#otherLinks {
margin-top: 10px;
}
#otherLinks a{
color: #000000;
}
#otherLinks a:hover{
color: #006a52;
}
<h1>Library Search</h1>
<form method="post" action="https://library.domains.skidmore.edu/search/searchBox.php" id="librarySearch">
<div id="searchSelection">
<span id="searchLabel">Catalog</span>
<img src="down.png" height="30px" width="30px" />
</div>
<div id="searchOptions">
<ul>
<li>
<button type="button" name="searchPref" value="Catalog" class="buttonSearch">
Catalog<br /><br /><span class="searchSubHeading">Search books and DVDs</span>
</button>
</li>
<li>
<button type="button" name="searchPref" value="SearchMore" class="buttonSearch">
SearchMore<br /><br /><span class="searchSubHeading">Search everything</span>
</button>
</li>
<li>
<button type="button" name="searchPref" value="Journals" class="buttonSearch">
Journals<br /><br /><span class="searchSubHeading">Search journals</span>
</button>
</li>
</ul>
</div>
<div id="searchInput">
<input type="hidden" id="searchChoice" name="searchPref" value="catalog" />
<input type="search" id="searchBox" size="60" name="searchText" placeholder="Search our holdings"/>
<button type="submit" id="submit"></button>
</div>
<div id="otherLinks">
Advanced Catalog Search |
WorldCat |
eBooks
</div>
</form>

Change backgroundcolor of text in textarea

I want to change the backgroundcolor of the text in a textarea.
NOT the background color of the textarea. The background of each character.
Like selecting the text.
I want to see the spaces at the end of each line. Or a single line without text and only spaces. The color should appear even on typing new text.
If possible I don't want to use javascript. Only CSS.
It should look like this:
. This one is selected text. I want it to see it without selecting.

You need to use javascript for highlighting text in textarea.
const bgcolor = "#3297FD";
const textarea = document.getElementById("textarea");
const bgtext = document.getElementById("highlight");
function highlight() {
bgtext.innerHTML = "";
let val = textarea.value;
let len = val.length;
for (let i = 0; i < len; i++) {
if (val[i] == "\n") {
bgtext.innerHTML += "<br />";
} else {
bgtext.innerHTML += "<span style=\"background-color: [[bgcolor]];\"> </span>".replace("[[bgcolor]]", bgcolor);
}
}
}
setInterval(highlight, 0);
.text {
position: fixed;
top: 20px;
left: 20px;
width: 300px;
height: 300px;
background-color: transparent;
margin: 0px;
font-size: 14px;
font-family: monospace;
white-space: pre;
color: white;
}
<style>
.text {
position: fixed;
top: 20px;
left: 20px;
width: 600px;
height: 600px;
background-color: transparent;
margin: 0px;
font-size: 14px;
font-family: monospace;
white-space: pre;
color: white;
}
</style>
<p id="highlight" class="text"></p>
<textarea id="textarea" class="text" style="left:17px; top:18px;"></textarea>

how to run javascript function 'live' without refresh?

im trying to make a average grade calculator, now thats is going fine but now i want to calculate the average immediately when a number gets inputted in one of the fields. I've been trying this with "on(), live(), onkeyup()" but can't get it to work.
The result of the average now displays beneath the inputfields 'onclick' on the button. I want the average displayed there but then as soon as you input numbers in one of the fields it should show there as it now does after the onclick.
What i've tryed with the 'on(), live(), onkeyup()' is to connect them to the input fields and connect them to the calculator() function.
Is there a easy way to do this or a other certain way?
greetings.
function calculator() {
var weight = 0;
var mark = 0;
var weights = document.querySelectorAll('[id^=weight-]');
var grades = document.querySelectorAll('[id^=mark-]');
var trs = document.getElementsByTagName('tr');
var tBody = document.getElementsByTagName('tbody')[0];
var totalWeight = 0;
var totalGrade = 0;
for (var i = 0; i < weights.length; i++) {
totalWeight += +weights[i].value;
}
for (var i = 0; i < grades.length; i++) {
totalGrade += +grades[i].value;
}
var finalGrade=totalGrade/totalWeight;
var display = document.getElementById('output-div');
var newTr = document.createElement('TR');
newTr.innerHTML = `<td><input id="weight-${trs.length + 1}" type="text" size=2 value=""></td><td><input id="mark-${trs.length + 1}" type="text" size=2 value=""></td>`;
tBody.appendChild(newTr);
display.innerHTML='Je gemiddelde is: ' +finalGrade.toFixed(2);
}
html {
background-color: ;
}
header {
background-color: ;
}
h2 {
text-align: center;
}
h3 {
text-align: center;
}
body {
font-family: 'Roboto', sans-serif;
}
table {
margin: auto;
}
tr {
background-color: ;
}
td {
background-color: ;
}
#table-title {
font-size: 20px;
font-style: italic;
text-align: center;
position: relative;
}
input {
text-align: center;
}
[id^="mark"] {
width: 100px;
}
[id^="weight"] {
width: 100px;
}
#calc-btn-div {
position: relative;
width: 150px;
margin: auto;
}
#calc-btn {
position: relative;
padding: 5px;
margin-top: 20px;
}
#calc-btn:hover {
border-color: black;
box-shadow: 8px 8px 8px 0 rgba(0,0,0,0.24), 0 17px 50px 0 rgba(0,0,0,0.19);
}
/* #add-input-div {
height: 50px;
text-align: center;
width: 300px;
margin: auto;
margin-top: 20px;
}
#add-input-btn {
position: relative;
padding: 5px;
margin-top: 20px;
}
#add-input-btn:hover {
border-color: black;
box-shadow: 8px 8px 8px 0 rgba(0,0,0,0.24), 0 17px 50px 0 rgba(0,0,0,0.19);
} */
#output-div {
background-color: ;
height: 50px;
text-align: center;
width: 300px;
margin: auto;
margin-top: 20px;
}
/* The Modal (background) */
.modal {
display: none; /* Hidden by default */
position: fixed; /* Stay in place */
z-index: 1; /* Sit on top */
left: 0;
top: 0;
width: 100%; /* Full width */
height: 100%; /* Full height */
overflow: auto; /* Enable scroll if needed */
background-color: rgb(0,0,0); /* Fallback color */
background-color: rgba(0,0,0,0.4); /* Black w/ opacity */
}
/* Modal Content/Box */
.modal-content {
background-color: #fefefe;
margin: 15% auto; /* 15% from the top and centered */
padding: 20px;
border: 1px solid #888;
width: 80%; /* Could be more or less, depending on screen size */
}
/* The Close Button */
.close {
color: #aaa;
float: right;
font-size: 28px;
font-weight: bold;
}
.close:hover,
.close:focus {
color: black;
text-decoration: none;
cursor: pointer;
}
<html>
<head>
<link href="https://fonts.googleapis.com/css?family=Roboto" rel="stylesheet">
</head>
<header>
<h2>Gemiddelde cijfer</h2>
<h3>Voer hieronder je cijfers in</h3>
</header>
<body>
<table id="table">
<tr id="table-title">
<td>Weging</td>
<td>Cijfer</td>
</tr>
<tr>
<td><input id="weight-1" type="text" size=2 value=""></td>
<td><input id="mark-1" type="text" size=2 value=""></td>
</tr>
</table>
<div id="calc-btn-div">
<input id="calc-btn" type="button" value="Berekenen je gemiddelde" onclick="calculator()">
</div>
<!-- <div id="add-input-div">
<input id="add-input-btn" type="button" value="Voeg cijfer toe" onclick="addInput()">
</div> -->
<div id="output-div"></div>
</body>
</html>

Using vanilla JavaScript I would attach an eventListener to the inputfields like this
document.getElementById('weight-1').addEventListener('change',function(){
calculator();
});
document.getElementById('mark-1').addEventListener('change',function(){
calculator();
});
These addEventListener functions adds listeners to the "input" field's predefined 'change'-events, and fires the calculator(); function from your code.
Seeing that you are using some sort of dynamic generation of the inputfields, you could add the listeners to your inputfields using the same querySelector that you use to target them during calculation. It would mean replacing getElementById('weight-1') in my example above with querySelectorAll('[id^=weight-]') for the weight-fields.
Also, doing work with values, IO, and calculation between html and JavaScript, I would suggest using a library like jQuery. jQuery simplifies these processes a lot.
This is the documentation for the jQuery alternative onClick function:
https://api.jquery.com/change/

I think you could do that with an angularJS module. Take a look at this tutorial : https://www.w3schools.com/angular/angular_modules.asp
maybe it will help.