I have set resize to vertical but I would like that when the user fills the textbox then its size expands down. Is there any way this can be done without using an external library like jQuery?
Only in CSS and contentEditable="true" attribute.
div {
display:inline-block;
border: solid 1px #000;
min-height: 200px;
width: 300px;
}
Demo Here
This has been answered here already: Creating a textarea with auto-resize
<!DOCTYPE html>
<html>
<head>
<title>autoresizing textarea</title>
<style type="text/css">
textarea {
border: 0 none white;
overflow: hidden;
padding: 0;
outline: none;
background-color: #D0D0D0;
resize: none;
}
</style>
<script type="text/javascript">
var observe;
if (window.attachEvent) {
observe = function (element, event, handler) {
element.attachEvent('on'+event, handler);
};
}
else {
observe = function (element, event, handler) {
element.addEventListener(event, handler, false);
};
}
function init () {
var text = document.getElementById('text');
function resize () {
text.style.height = 'auto';
text.style.height = text.scrollHeight+'px';
}
/* 0-timeout to get the already changed text */
function delayedResize () {
window.setTimeout(resize, 0);
}
observe(text, 'change', resize);
observe(text, 'cut', delayedResize);
observe(text, 'paste', delayedResize);
observe(text, 'drop', delayedResize);
observe(text, 'keydown', delayedResize);
text.focus();
text.select();
resize();
}
</script>
</head>
<body onload="init();">
<textarea rows="1" style="height:1em;" id="text"></textarea>
</body>
</html>
Example: https://jsfiddle.net/hmelenok/WM6Gq/
Credits go to panzi, vote him up here: https://stackoverflow.com/a/5346855/1540350
Related
This code will turn the bulb on/off but i want to make the lightbulbs keeps flashing. I've tried different methods and nothing works
<!DOCTYPE html>
<html>
<body>
<img id="bulb" onclick="switch()" src="off.png" width="100" height="180">
<p>On/Off</p>
<script>
function
switch () {
var image = document.getElementById('Bulb');
if (image.src.match("on")) {
image.src = "off.png";
} else {
image.src = "on.png";
}
}
</script>
</body>
</html>
Here is an example, using setInterval(). I have swapped the image to a div thats background changes color, but same principal applies.
I think its also worth pointing out that you could also do this with a css animation and then just use javascript to toggle the class onto the element. But assuming you just wanna stick to JS for now:
let flashInterval = null;
let flashSpeed = 100;
let bulb = document.getElementById('bulb');
function toggleBulb() {
if (bulb.classList.contains('on')) {
bulb.classList.remove('on');
} else {
bulb.classList.add('on');
}
}
function flashBulb() {
if (flashInterval === null) {
flashInterval = setInterval(() => {
toggleBulb();
}, flashSpeed);
} else {
clearInterval(flashInterval);
flashInterval = null;
}
}
document.getElementById('toggleBlub').addEventListener('click', toggleBulb);
document.getElementById('toggleFlash').addEventListener('click', flashBulb);
#bulb {
width: 50px;
height: 50px;
border-radius: 50%;
border: 1px solid #ccc;
background: transparent:
}
.on {
background: #fcba03;
}
<div id="bulb" class=""></div>
<br>
<button id="toggleBlub">Bulb On/Off</button>
<br><br>
<button id="toggleFlash">Flash On/Off</button>
in my opinion, don't use setInterval but u can use a CSS animation rather than it.
You should know about js event and js reserve keyword and be sure to use good code editor so that you can see your error.
I see you trying to keep flashing but you used onclick event that is clickable it will not flashing.
here is the code below, which you want,
<!DOCTYPE html>
<html>
<body>
<img id="bulb" src="off.jpg" width="100" height="180">
<p>On/Off</p>
<script>
var myImage = document.querySelector('#bulb');
var update = setInterval(myUpdate, 1000);
function myUpdate() {
setTimeout(() => {
if (myImage.src.match('off.jpg')) {
myImage.src = 'on.jpg'
} else {
myImage.src = 'off.jpg'
}
}, 500)
}
</script>
</body>
</html>
or you can use onclick event, when you click than it will start flashing
here is the code below
<!DOCTYPE html>
<html>
<body>
<img id="bulb" onclick="mySwitch(this)" src="off.jpg" width="100" height="180">
<p>On/Off</p>
<script>
function mySwitch(myImage) {
var update = setInterval(myUpdate, 500);
function myUpdate() {
setTimeout(() => {
if (myImage.src.match('off.jpg')) {
myImage.src = 'on.JPG'
} else {
myImage.src = 'off.jpg'
}
}, 100)
console.log(myImage)
}
}
</script>
</body>
</html>
I changed your function name to switchBulb because switch is reserved
var intervalID = window.setInterval(switchBulb, 1000);
function switchBulb() {
var image = document.getElementById('bulb');
if (image.src.match("on")) {
image.src = "off.png";
} else {
image.src = "on.png";
}
}
I'm placing description on a text area by retrieving database using jsp, like follows;
<textarea readonly=""><%= item.getContent() %></textarea>
so I want to show the whole content of textarea in page without scroll bar, how can I do it?
You can refer to following link
http://jsfiddle.net/TDAcr/
<head>
<title>autoresizing textarea</title>
<style type="text/css">
textarea {
border: 0 none white;
overflow-y: auto;
padding: 0;
outline: none;
background-color: #D0D0D0;
resize: none;
}
</style>
<script type="text/javascript">
var observe;
if (window.attachEvent) {
observe = function (element, event, handler) {
element.attachEvent('on'+event, handler);
};
}
else {
observe = function (element, event, handler) {
element.addEventListener(event, handler, false);
};
}
function init (maxH) {
var text = document.getElementById('text');
var maxHeight=maxH;
var oldHeight= text.scrollHeight;
var newHeight;
function resize () {
text.style.height = 'auto';
newHeight= text.scrollHeight;
if(newHeight>oldHeight && newHeight>maxHeight )
{
text.style.height=oldHeight+'px';
}
else{
text.style.height = newHeight+'px';
oldHeight= text.scrollHeight;
}
}
/* 0-timeout to get the already changed text */
function delayedResize () {
window.setTimeout(resize, 0);
}
observe(text, 'change', resize);
observe(text, 'cut', delayedResize);
observe(text, 'paste', delayedResize);
observe(text, 'drop', delayedResize);
observe(text, 'keydown', delayedResize);
text.focus();
text.select();
resize();
}
</script>
</head>
<body onload="init(200);">
<textarea rows="1" style="height:1em;" id="text"></textarea>
</body>
</html>
I'm new and learning to code a website!
I'm trying to do this hover header that when the user scroll down, it will remain on the screen and when the user reaches Sub-Header 1, it will hover it too and changes if the user reaches Sub-Header 2(Sub-Header 1 will then disappear)
This is what I'm working on http://goo.gl/KqAM2R
Thanks in advance!
http://i.imgur.com/flT3oJ1.jpg
You need to use JavaScript to achieve this effect. SSCCE:
NewFile.html
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<script type="text/javascript" src="http://code.jquery.com/jquery-2.1.4.min.js"></script>
<script src="NewFile.js"></script>
<link rel="stylesheet" type="text/css" href="NewFile.css"></head>
<body>
<header class="fixed-top">Europe</header>
<div class="much-text">doge</div>
<header class="whatever1 doge">Heatwave</header>
<div class="much-text">doge</div>
<header class="whatever2 doge">2k15</header>
<div class="much-text">doge</div>
</body>
</html>
NewFile.js:
function isElementInViewport (el, topOrBottom) {
//special bonus for those using jQuery
if (typeof jQuery === "function" && el instanceof jQuery) {
el = el[0];
}
var rect = el.getBoundingClientRect();
if(topOrBottom == "top"){
return rect.top >= 0;
}else{
return rect.bottom <= $(window).height();
}
}
function onVisibilityChange () {
var headers = document.getElementsByClassName("doge");
var headerAbove = null;
for(i = 0; i<headers.length; i++){
$( headers[i]).css("position","");
$( headers[i]).css("top","");
if(!isElementInViewport(headers[i], "top")){
headerAbove = headers[i];
}
}
if(headerAbove != null){
$( headerAbove).css("position","fixed");
$( headerAbove).css("top","30px");
}
}
$(window).on('DOMContentLoaded load resize scroll', onVisibilityChange);
And NewFile.css
#CHARSET "UTF-8";
.fixed-top{
width:100%;
position:fixed;
top:0px;
background-color: red;
}
.whatever1{
width:100%;
background-color: green;
}
.whatever2{
width:100%;
background-color: blue;
}
.much-text{
height: 2000px;
}
.doge {
}
Thanks to authors of answers in How to tell if a DOM element is visible in the current viewport? for an inspiration. Also, I am aware that this code doesn't meet all good practices writing in js & css but OP clearly can find the idea from this one. Notice that you may need to sort headers (from the top header to the bottom header) in your own way before iterating on them in function onVisibilityChange
Try this...
HTML
<div id="page" class="page">
<div class="container">
<div class="contentheadercontainer">
<div class="fsh"><div class="firstheader">Sub header 1</div></div>
<div class="fsh"><div class="secondheader" id='secondheader'><p style='margin-left: 15px;'>Sub header 2</p></div></div>
</div>
</div>
</div>
</div>
CSS
body{
padding: 0px; margin: 0px;
}
.container{
height: 1000px;
}
.fsh{
position: absolute; width: 100%;
}
.firstheader{
height: 30px;width: 100%; position:fixed; background: #B14345; padding: 15px; color: #fff;
}
.secondheader{
border-top: 1px solid #bbb; padding: 5px 0px 5px 0px; margin-top: 300px; width: 100%; background: #B14345;color: #fff;
}
Javascript
document.addEventListener("scroll", function(){
scrollDetect();
});
function scrollDetect(){
var html = document.documentElement;
var top = (window.pageYOffset || html.scrollTop) - (html.clientTop || 0);
if(top > 235){
document.getElementById('secondheader').style.position = 'fixed';
document.getElementById('secondheader').style.marginTop = '60px';
document.getElementById('secondheader').style.width='100%';
}else{
document.getElementById('secondheader').style.position = 'inherit';
document.getElementById('secondheader').style.marginTop = '300px';
}
}
Check out this JSFiddle
i am exploring the API of the get user media and tried running the api in my localhost with sample code attached below
It is working fine in jsbin here
but completely fails in localhost with below errors
Uncaught TypeError: Cannot read property 'addEventListener' of null capture.html:43
Uncaught TypeError: Cannot set property 'src' of null
Code :
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Title of the document</title>
<script>
(function() {
var streaming = false,
video = document.querySelector('#video'),
cover = document.querySelector('#cover'),
canvas = document.querySelector('#canvas'),
photo = document.querySelector('#photo'),
startbutton = document.querySelector('#startbutton'),
width = 200,
height = 0;
navigator.getMedia = ( navigator.getUserMedia ||
navigator.webkitGetUserMedia ||
navigator.mozGetUserMedia ||
navigator.msGetUserMedia);
navigator.getMedia(
{
video: true,
audio: false
},
function(stream) {
if (navigator.mozGetUserMedia) {
video.mozSrcObject = stream;
} else {
var vendorURL = window.URL || window.webkitURL;
video.src = vendorURL ? vendorURL.createObjectURL(stream) : stream;
}
video.play();
},
function(err) {
console.log("An error occured! " + err);
}
);
video.addEventListener('canplay', function(ev){
if (!streaming) {
height = video.videoHeight / (video.videoWidth/width);
video.setAttribute('width', width);
video.setAttribute('height', height);
canvas.setAttribute('width', width);
canvas.setAttribute('height', height);
streaming = true;
}
}, false);
function takepicture() {
canvas.width = width;
canvas.height = height;
canvas.getContext('2d').drawImage(video, 0, 0, width, height);
var data = canvas.toDataURL('image/png');
photo.setAttribute('src', data);
}
startbutton.addEventListener('click', function(ev){
takepicture();
ev.preventDefault();
}, false);
})();
</script>
<style>
html {
background: #111111;
height: 100%;
background: linear-gradient( #333, #000);
}
canvas {
display: none;
}
video, img, #startbutton {
display: block;
float: left;
border: 10px solid #fff;
border-radius: 10px;
}
#startbutton {
background: green;
border: none;
color: #fff;
margin: 100px 20px 20px 20px;
padding: 10px 20px;
font-size: 20px;
}
#container {
overflow: hidden;
width: 880px;
margin: 20px auto;
}
</style>
</head>
<body>
<video id="video"></video>
<button id="startbutton">Take photo</button>
<canvas id="canvas"></canvas>
<img src="http://placekitten.com/g/200/150" id="photo" alt="photo">
</body>
</html>
It is because your script is trying to access html elements that have not been created yet. HTML is read from the top down. Move your script into the body of your page, or tell it not to execute until the whole page loads.
It worked fine for me when I moved your script to the body instead of the head of the page.
I am making an online scratchcard and i need to know how to change my cursor into a coin.
here is an example of the code i already have tried:
<div id="krasvak" class="scratchpad"></div>
<style>
#krasvak {
width: 25%;
height: 100px;
border: solid 1px;
display: inline-block;
}
</style>
<script type="text/javascript" src="wScratchPad.js"></script>
<script type="text/javascript">
$('#krasvak').wScratchPad({
cursor: 'cursor: url("images/muntje.png"), auto;',
scratchMove: function (e, percent) {
console.log(percent);
if (percent > 70)
{
this.clear();
window.alert("U heeft uw code gekrast");
window.location.href='compleet.php';
}
}
});
$('#krasvak').wScratchPad('bg', 'images/slide1.png');
$('#krasvak').wScratchPad('fg', 'images/overlay.png');
$('#krasvak').wScratchPad('size', 10);
</script>
and here is a part of the java script code
$.fn.wScratchPad.defaults = {
size : 5, // The size of the brush/scratch.
bg : '#cacaca', // Background (image path or hex color).
fg : '#6699ff', // Foreground (image path or hex color).
realtime : true, // Calculates percentage in realitime
scratchDown : null, // Set scratchDown callback.
scratchUp : null, // Set scratchUp callback.
scratchMove : null, // Set scratcMove callback.
cursor : 'crosshair' // Set cursor.
};
I would really appriciate it if someone could help me out.
According to the github of the plugin there's a solution:
Update on the Fly
var sp = $("#elem").wScratchPad();
sp.wScratchPad('size', 5);
sp.wScratchPad('cursor', 'url("./cursors/coin.png") 5 5, default');
// Or directly with element.
$("#elem").wScratchPad('image', './images/winner.png');
So try this:
<div id="krasvak" class="scratchpad"></div>
<style>
#krasvak {
width: 25%;
height: 100px;
border: solid 1px;
display: inline-block;
}
</style>
<script type="text/javascript" src="wScratchPad.js"></script>
<script type="text/javascript">
$('#krasvak').wScratchPad({
scratchMove: function (e, percent) {
console.log(percent);
if (percent > 70)
{
this.clear();
window.alert("U heeft uw code gekrast");
window.location.href='compleet.php';
}
}
});
$('#krasvak').wScratchPad('bg', 'images/slide1.png');
$('#krasvak').wScratchPad('fg', 'images/overlay.png');
$('#krasvak').wScratchPad('size', 10);
$('#krasvak').wScratchPad('cursor', 'url("./images/muntje.png") 5 5, default');
</script>
The syntax is
cursor:url(URL TO THE IMAGE)
I don't recommend disk paths (they might not even work). Use a relative path, i.e.
../Scratch the code/images/muntje.png
Try this:
cursor: url("images/muntje.png"), auto;
Make sure the path to the images directory is correct, relative to the path your CSS file is located.
Hi Please use the path like
cursor: url("/Bram/Bram/Scratch the code/images/muntje.png");
if u want to give the full path and access the html file locally
cursor: url("file://C:/xampp/htdocs/Bram/Scratch the code/images/muntje.png");
Put it in the CSS, not in the JavaScript. Maybe that works.
<div id="krasvak" class="scratchpad"></div>
<style>
#krasvak {
cursor: url("images/muntje.png"), auto;
width: 25%;
height: 100px;
border: solid 1px;
display: inline-block;
}
</style>
<script type="text/javascript" src="wScratchPad.js"></script>
<script type="text/javascript">
$('#krasvak').wScratchPad({
scratchMove: function (e, percent) {
console.log(percent);
if (percent > 70)
{
this.clear();
window.alert("U heeft uw code gekrast");
window.location.href='compleet.php';
}
}
});
$('#krasvak').wScratchPad('bg', 'images/slide1.png');
$('#krasvak').wScratchPad('fg', 'images/overlay.png');
$('#krasvak').wScratchPad('size', 10);
</script>