This question already has answers here:
Why does jQuery or a DOM method such as getElementById not find the element?
(6 answers)
Closed 7 years ago.
I am pretty new to javascript and want to code a header of an html site.
JS: when the window width is smaller than 1215px --> left part goes 100% width; right part of the header to 0
I always get the "Cannot read property 'setAttribute' of null " Error!
Please Help!
Code:
if (window.innerWidth < 1215) {
document.getElementById("#headerLeft").setAttribute("style", "width:100%");
document.getElementById("#headerRight").setAttribute("style", "width:0%");
} else {
document.getElementById("#headerLeft").setAttribute("style", "width:50%");
document.getElementById("#headerRight").setAttribute("style", "width:50%");
}
body {
margin:0;
}
header{
height:100px;
width:100%;
}
#headerLeft {
background-color:#FF7043;
height:100px;
float:left;
}
#headerRight {
background-color:#FFFFFF;
height:100px;
float:right;
}
.headerTitle {
font-family:'Roboto', sans-serif;
margin:15px;
font-size:70px;
}
#headerRight .headerTitle {
text-align:left;
color:#FF7043;
font-weight:300;
}
#headerLeft .headerTitle {
text-align:center;
color:#FFFFFF;
font-weight:900;
}
<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<title>example</title>
<!-- css -->
<link type="text/css" rel="stylesheet" href="style.css">
<!-- fonts -->
<link href='https://fonts.googleapis.com/css?family=Roboto:400,500,700,900,100,300' rel='stylesheet' type='text/css'>
<!-- javascripts -->
<script language="javascript" type="text/javascript" src="script.js"></script>
</head>
<body>
<header>
<div id="headerLeft">
<p class="headerTitle">example</p>
</div>
<div id="headerRight">
<p class="headerTitle">example</p>
</div>
</header>
<nav>
</nav>
<main>
</main>
<footer>
</footer>
</body>
</html>
It is because all of your calls to document.getElementById are failing to find anything since there aren't any elements with those IDs. Looks like jQuery habits in play, remove the # from your IDs.
At first do selection by Id without '#'.
The second is to set style in such way:
document.getElementById('').style.width = "20%";
Related
This question already has answers here:
Uncaught ReferenceError: $ is not defined?
(40 answers)
Closed 6 years ago.
here is my problem. I have the code that you see below. Why it doesn't work like it does here: http://jsfiddle.net/e6kaV/33/ ?
There is the error that is shown to me:
{
"message": "Uncaught ReferenceError: $ is not defined",
"filename": "http://stacksnippets.net/js",
"lineno": 54,
"colno": 13
}
Every help is appreciated, because I don't know how JS or jQuery works.
.pane-launcher{
position:absolute;
top: 0;
width:80px;
height:80px;
display:block;
}
#rules {
left:0px;
}
#scenarios {
left:90px;
}
.pane{
position:absolute;
left: 0;
height:50px;
display:none;
opacity:1;
}
#rules-pane {
top:80px;
width:170px;
background-color:yellow;
}
#scenarios-pane {
top:80px;
width:170px;
background-color:blue;
}
<html lang="en">
<head>
<meta charset="utf-8" />
<title>TEST</title>
<link rel="stylesheet" href="css.css">
</head>
<body>
<div id="rules" class="pane-launcher"><img src="http://placehold.it/80x80"></div>
<div id="rules-pane" class="pane">Model1</div>
<div id="scenarios" class="pane-launcher"><img src="http://placehold.it/80x80"></div>
<div id="scenarios-pane" class="pane">Model2<br><img src="http://placehold.it/170x20"></div>
<script>
$(".pane-launcher").click(function () {
// Set the effect type
var effect = 'slide';
// Set the options for the effect type chosen
var options = { direction: 'up' };
// Set the duration (default: 400 milliseconds)
var duration = 700;
$('.pane.active, #'+this.id+'-pane').toggle(effect, options, duration).toggleClass('active');
});</script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
</body>
</html>
Load jQuery before using it:
<html lang="en">
<head>
<meta charset="utf-8" />
<title>TEST</title>
<link rel="stylesheet" href="css.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
</head>
<body>
<div id="rules" class="pane-launcher"><img src="http://placehold.it/80x80"></div>
<div id="rules-pane" class="pane">Model1</div>
<div id="scenarios" class="pane-launcher"><img src="http://placehold.it/80x80"></div>
<div id="scenarios-pane" class="pane">Model2<br><img src="http://placehold.it/170x20"></div>
<script>
$(".pane-launcher").click(function () {
// Set the effect type
var effect = 'slide';
// Set the options for the effect type chosen
var options = { direction: 'up' };
// Set the duration (default: 400 milliseconds)
var duration = 700;
$('.pane.active, #'+this.id+'-pane').toggle(effect, options, duration).toggleClass('active');
});
</script>
</body>
</html>
I put it in the <head> but you can put it anywhere, as long as it's before the code that uses $ ($ is jQuery).
You should add jquery before you can use it. Here is the working example. I have just removed the script tag of jquery from bottom and placed it before other scripts.
Here is the pen http://codepen.io/anon/pen/xOzjWg
$(".pane-launcher").click(function () {
// Set the effect type
var effect = 'slide';
// Set the options for the effect type chosen
var options = { direction: 'up' };
// Set the duration (default: 400 milliseconds)
var duration = 700;
$('.pane.active, #'+this.id+'-pane').toggle(effect, options, duration).toggleClass('active');
});
.pane-launcher{
position:absolute;
top: 0;
width:80px;
height:80px;
display:block;
}
#rules {
left:0px;
}
#scenarios {
left:90px;
}
.pane{
position:absolute;
left: 0;
height:50px;
display:none;
opacity:1;
}
#rules-pane {
top:80px;
width:170px;
background-color:yellow;
}
#scenarios-pane {
top:80px;
width:170px;
background-color:blue;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jqueryui/1.11.4/jquery-ui.min.js"></script>
<div id="rules" class="pane-launcher"><img src="http://placehold.it/80x80"></div>
<div id="rules-pane" class="pane">Model1</div>
<div id="scenarios" class="pane-launcher"><img src="http://placehold.it/80x80"></div>
<div id="scenarios-pane" class="pane">Model2<br><img src="http://placehold.it/170x20"></div>
Thanks for help everybody, got it working after i included these 3 scripts link (which was an answer in suggested related question).
<script src="http://code.jquery.com/jquery-1.10.2.js"></script>
<script src="http://code.jquery.com/ui/1.11.2/jquery-ui.js"></script>
<script src="http://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/js/bootstrap.min.js"></script>
I'm working on a website for a school project and I'm having trouble with using the javascript. I am not a fan of js because I always have issues with it and I can never seem to get them figured out without help, but it is one of the requirements for the project. I am trying to make the title in the page move in from off the left side of the page and into the center when the page loads. Here is my code:
JS:
function animate() {
function movetext() {
obj = document.getElementById('spacer');
obj.style.position ='relative';
obj.style.left = '-100px'; //still needs to be adjusted
}
function moveright() {
obj.style.alignContent="center";
obj.style.animation="move 2s";
}
}
HTML:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Lockport, NY - Activities</title>
<link rel="stylesheet" href="project.css">
<link href='https://fonts.googleapis.com/css?family=Oleo+Script+Swash+Caps' rel='stylesheet' type='text/css'>
</head>
<body onload="animate();">
<!-- Background -->
<div class="background">
<!-- Navigation -->
<?php
include 'includes/nav.php';
?>
<!-- Title -->
<div id="spacer"><p span class="titles">Activities...</p></div>
<div id="wrapper">
<div id="main">
//code removed for readability
</div>
<!-- Footer -->
<?php
include 'includes/footer.php';
?>
</div>
</div>
</body>
<script src="project1.js"></script>
</html>
I know I'm not the greatest when it comes to coding, and I know its probably a simple fix but I can't find it. Help is appreciated.
You can do this easily with CSS animations:
setTimeout(function() {
document.getElementById('spacer').classList.add('show');
}, 100);
#spacer {
position: absolute;
right: 100%;
transition: right 3s;
}
#spacer.show {
right: 50%;
}
<div id="spacer">
<p class="titles">
Hello
</p>
</div>
A more elegant solution for this would be to use two classes (e.g. .centerpos, .title) and just assign the class with the styling for centering the text via js.
So it would look something like that:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Lockport, NY - Activities</title>
<link href='https://fonts.googleapis.com/css?family=Oleo+Script+Swash+Caps' rel='stylesheet' type='text/css'>
</head>
<style>
.title {
position: absolute;
left: -100px;
transition: left 2s;
}
.title.centerpos {
left: 50%;
transform: translate(-50%, 0);
}
</style>
<body onload="document.querySelector('.title').classList.add('centerpos');">
<div class="background">
<div id="spacer"><p span class="titles title">Activities...</p></div>
<div id="wrapper">
<div id="main">
//code removed for readability
</div>
</div>
</div>
</body>
</html>
So, I have a simple onclick function set up that is supposed to change the background of a div. Here is my JS code;
var colour = document.getElementById("backgroundColour");
function changeToColour1() {
colour.style.backgroundColor = "#47535F";
}
function changeToColour2() {
colour.style.backgroundColor = "#82A3B2";
}
Here is my HTML code;
<button id="colour1" class="colours" onclick="changeToColour1()"></button>
<button id="colour2" class="colours" onclick="changeToColour2()"></button>
<div id="backgroundColour"></div>
How would I get the div to change its colour when the button is clicked?
a much cleaner way of doing this would be to just use javascript to add classes to your elements, and let CSS control the colors.
$('#colour1').on('click',function(){
$('#backgroundColour').removeClass('colour1 colour2').addClass('colour1');
});
$('#colour2').on('click',function(){
$('#backgroundColour').removeClass('colour1 colour2').addClass('colour2');
});
and in your CSS put
#backgroundColour.colour1 {
background-color: #47535F;
}
#backgroundColour.colour2 {
background-color: #82A3B2;
}
Give the Div a proper width and height or some content, otherwise the
div cannot be seen.
Avoid inline event handlers and use DOM3 event handlers.
You can also use data-* attributes to store the colors instead of
having a seperate function for each button.
HTML
<button id="colour1" class="colours" data-color="#47535F" >Click me</button>
<button id="colour2" class="colours" data-color="#82A3B2">Click me</button>
<div id="backgroundColour">fff</div>
JS
var colourDiv = document.getElementById("backgroundColour");
var colours = document.getElementsByClassName('colours');
for(var i=0; i< colours.length; i++) {
colours[i].addEventListener('click', function() {
var color = this.getAttribute('data-color');
colourDiv.style.backgroundColor = color;
});
}
Check Fiddle
first and foremost i recommend you to use JQuery for the task you are trying to accomplish, im recommending you do for the simple fact JQuery is a simple straight forward library for javascript that makes our lives as coders a lot more simple, now that im done saying that here is the code.
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8" /><meta http-equiv="content-language" content="en-US" />
<title>...</title>
<style type="text/css">
html, body{
width:auto;
height:auto;
}
#changing{ /*this is the css for our javascript*/
margin:0px;
padding:0px;
width:100%;
height:100%;
position:absolute;
top:0px;
left:0px;
right:0px;
bottom:0px;
}
#wrap{ /*this is to keep the browse menu that has your buttons from disappearing below the changing div*/
margin:0px;
padding:0px;
width:100%;
height:40px;;
background-color:#000000;
border-bottom:5px solid #D8D8D8;
border-radius:0px;
position:fixed;
top:0px;
left:0px;
z-index:10;
}
#button1, #button2{
margin:0px;
padding:0px;
width:auto;
height:auto;
position:fixed;
}
#button1{
top:0px;
left:0px;
}
#button2{
top:0px;
right:0px;
}
</style>
<script rel="javascript" type="text/javascript" src="//ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
</head>
<body>
<div id="body-container">
<div id="wrap">
<input type="button" id="button1" value="click me" />
<input type="button" id="button2" value="click me 2" />
</div>
<div id="changing">
</div>
</div>
<script>
$("#button1").click(function(){
$("#changing").css("background-color", "#47535F");//changes the color of the background to #47535F
})
$("#button2").click(function(){
$("#changing").css("background-color", "#82A3B2");//changes the color of the background to #82A3B2
})
</script>
</body>
</html>
in this code we use inline css and javascript with the JQuery library, we first start the document how we should always start a html document by adding the DOCTYPE and our meta tags with the attributes content-type and content-language we also add a title.
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8" /><meta http-equiv="content-language" content="en-US" />
<title>...</title>
</head>
<body>
</body>
</html>
next we add our our script to import the JQuery library, i usually go with the google hosted version because its usually up and running and i dont have to constantly update it , google does that for you, the only thing you need to do is add the new url in the src to replace the old version of JQuery.
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8" /><meta http-equiv="content-language" content="en-US" />
<title>...</title>
<script rel="javascript" type="text/javascript" src="//ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
</head>
<body>
</body>
</html>
next we add our html, in our html we added two buttons and placed them in a div called wrap and added our changing div and placed both the changing div and the wrap div into a div called body-container.
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8" /><meta http-equiv="content-language" content="en-US" />
<title>...</title>
<script rel="javascript" type="text/javascript" src="//ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
</head>
<body>
<div id="body-container">
<div id="wrap">
<input type="button" id="button1" value="click me" />
<input type="button" id="button2" value="click me 2" />
</div>
<div id="changing">
</div>
</div>
</body>
</html>
now time to add the icing to the cake with our script and css, here we added our css to determine the style of our page we made ours so that the browse menu were are buttons are located scroll with the page and are always onto, now onto the script, we made our script so that if the button is pressed it will change the background of the div body-container.
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8" /><meta http-equiv="content-language" content="en-US" />
<title>...</title>
<style type="text/css">
html, body{
width:auto;
height:auto;
}
#changing{ /*this is the css for our javascript*/
margin:0px;
padding:0px;
width:100%;
height:100%;
position:absolute;
top:0px;
left:0px;
right:0px;
bottom:0px;
}
#wrap{ /*this is to keep the browse menu that has your buttons from disappearing below the changing div*/
margin:0px;
padding:0px;
width:100%;
height:40px;;
background-color:#000000;
border-bottom:5px solid #D8D8D8;
border-radius:0px;
position:fixed;
top:0px;
left:0px;
z-index:10;
}
#button1, #button2{
margin:0px;
padding:0px;
width:auto;
height:auto;
position:fixed;
}
#button1{
top:0px;
left:0px;
}
#button2{
top:0px;
right:0px;
}
</style>
<script rel="javascript" type="text/javascript" src="//ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
</head>
<body>
<div id="body-container">
<div id="wrap">
<input type="button" id="button1" value="click me" />
<input type="button" id="button2" value="click me 2" />
</div>
<div id="changing">
</div>
</div>
<script>
$("#button1").click(function(){
$("#changing").css("background-color", "#47535F");//changes the color of the background to #47535F
})
$("#button2").click(function(){
$("#changing").css("background-color", "#82A3B2");//changes the color of the background to #82A3B2
})
</script>
</body>
</html>
i hoped this helped, for any information on JQuery i recommend you go visit their online documents, they have a lot of useful info there, here is the link
http://api.jquery.com/
you can also check out w3chools they have a lot of good stuff on JQuery as well as many other programming languages, here is the link
http://www.w3schools.com/
best of luck with your project or learning the javascript language (=
Im trying to implement a simple plugin that resize image based on a container.
The problem is , I don't understand why it's not resizing my image when I placed it inside a container
This is the simple plugin demo page i'm trying to replicate
https://dl.dropboxusercontent.com/u/6983010/wserv/imgLiquid/examples/imgLiquid.html
This is my Code
<html>
<head>
<link rel="stylesheet" href="css/float.css">
<script type = "text/javascript" src ="http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<script type = "text/javascript" src ="https://raw.github.com/karacas/imgLiquid/master/src/js/imgLiquid-min.js"></script>
<script type="text/javascript">
$(document).ready(function () {
$(".imgLiquidFill").imgLiquid({fill:true, fadeInTime:500});
$(".imgLiquidNoFill").imgLiquid({fill:false});
});
</script>
</head>
<body>
<div class="container" >
<img src="Creek.jpg"/></div>
</div>
</body>
</html>
My CSS
.container {height: 440px; width: 950px; background:#FFFFFF}
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
<title>Image</title>
<style>
.container{
background-color:#f7f7f7;
border:2px solid #ccc;
margin:10px;
display:inline-block;
}
.imgLiquid {
display:block;
overflow: hidden;
background:transparent url('http://www.lotienes.com/imagenes/loading.gif') no-repeat center center;
}
.imgLiquid img{
visibility:hidden;
}
</style>
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"
type="text/javascript"></script>
<script type="text/javascript"
src="https://raw.github.com/karacas/imgLiquid/master/src/js/imgLiquid-min.js"></script>
<script type="text/javascript">
$(document).ready(function () {
$(".imgLiquidFill").imgLiquid({
fill: true,
fadeInTime:200,
horizontalAlign: "center",
verticalAlign: "top"
});
});
</script>
</head>
<body>
<div class="container">
<span class="imgLiquidFill imgLiquid" style="width:250px; height:250px;">
<a href="/media/Woody.jpg" target="_blank" title="test">
<img alt="" src="/media/Woody.jpg"/>
</a>
</span>
</div>
</body>
</html>
Your changing the codes and you forgot to define the imgLiquidFill and imgLiquid in the class which is very important to make this plugin effective. In modifying the codes make sure you didn't forgot anything. Another thing is you can rename the class but make sure you also rename it in the script to make it the same.
Thanks ALOT guys! I've got it working now, thank you!
I have a hopefully easy question:
This: http://jsfiddle.net/gSAjV/2/
is what I want to achieve, but I can't seem to get it working.
I'm all new to javascript, so I'm not sure how to properly put the script in the html document.
I have tried the <script type="text/javascript"> and others, but it just doesn't work.
So i wondered if anyone would take the time to put it in a html document and get it working, and ofcourse posting the entire code. I would be very greatfull!
my doc:
<html>
<head>
<style>
.parentDiv{
border:1px solid black;
padding:10px;
width: 80px;
margin:5px;
display:relative;
}
.childDiv{
border:1px solid blue;
height: 50px;
margin:10px;
}
</style>
<script type='text/javascript'>
$('.childDiv').click(function(){
$(this)
.css('background-color','#00ff66')
.siblings()
.css('background-color','#ffffff');
});
</script>
</head>
<body>
<div id="divParent1" class="parentDiv">
Group 1
<div id="child1" class="childDiv">
Child 1
</div>
<div id="child2" class="childDiv">
Child 2
</div>
</div>
<div id="divParent2" class="parentDiv">
Group 2
<div id="child1" class="childDiv">
Child 1
</div>
<div id="child2" class="childDiv">
Child 2
</div>
</div>
</body>
</html>
Put this somewhere in your html file:
<script type="text/javascript">
$(document).ready(function() {
$('.childDiv').click(function(){
$(this).parent().find('.childDiv').css('background-color','#ffffff');
$(this).css('background-color','#ff0000');
});
});
</script>
You can put it more or less anywhere, but just before the </body> tag would be a good place.
And as #MarkK has rightly pointed out, you need to reference the jQuery library itself.
This goes between <head> and </head>:
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
In jsfiddle, you can right-click on the Results pane and View Source. This will give you the exact html that produces the result.
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<title> - jsFiddle demo</title>
<script type='text/javascript' src='http://code.jquery.com/jquery-1.4.4.min.js'></script>
<link rel="stylesheet" type="text/css" href="/css/normalize.css">
<link rel="stylesheet" type="text/css" href="/css/result-light.css">
<style type='text/css'>
.parentDiv{
border:1px solid black;
padding:10px;
width: 80px;
margin:5px;
display:relative;
}
.childDiv{
border:1px solid blue;
height: 50px;
margin:10px;
}
</style>
<script type='text/javascript'>//<![CDATA[
$(window).load(function(){
$('.childDiv').click(function(){
$(this).parent().find('.childDiv').css('background-color','#ffffff');
$(this).css('background-color','#ff0000');
});
});//]]>
</script>
</head>
<body>
<div id="divParent1" class="parentDiv">
Group 1
<div id="child1" class="childDiv">
Child 1
</div>
<div id="child2" class="childDiv">
Child 2
</div>
</div>
<div id="divParent2" class="parentDiv">
Group 2
<div id="child1" class="childDiv">
Child 1
</div>
<div id="child2" class="childDiv">
Child 2
</div>
</div>
</body>
</html>
You just need to import jQuery (the library that contains the $ functions). This is simple, just add
<script src="http.//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
to your HTML, before your other script.
<html>
<head>
<!--inclue jquery - change the path 'src'. the default is jquery.js is on the same location of this html-->
<script type="text/javascript" src="jquery.js"></script>
<sript type="text/javascript">
jQuery().ready(function($){
$('.childDiv').click(function(){
$(this).parent().find('.childDiv').css('background-color','#ffffff');
$(this).css('background-color','#ff0000');
});
});
</script>
</head>
<body>
<!--the content paste your html here-->
</body>
</html>