How to replace an image with another on button click - image

Hi I have a problem that I can't quite solve. I'm a total noob with HTML/Javascript, so I'm not sure how to proceed. The instructions are in the code:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Q2</title>
<script type="text/javascript" src="342.js"></script>
<script type="text/javascript">
function swap() {
if (Math.random()>.5){
document.getElementById("c").style.display = 'none';
document.getElementById("f").src = "images/f.jpg";
} else {
document.getElementById("d").style.display = 'none';
document.getElementById("f").src = "images/f.jpg";
}
}
</script>
</head>
<body>
<p>Add code so that clicking the button changes either the src "c.jpg" or "d.jpg" to "f.jpg" The choice of which should be replaced
should be determined randomly.</p>
<img src="images/c.jpg" id="c"><br>
<img src="images/d.jpg" id="d">
<br><br>
<button type="button" onclick="swap()">OK</button>
</body>
</html>
The original problem had everything but the scripts. When I try this, I'm able to get the image c or d to disappear, but image f doesn't appear. I don't know how to get the image to show. getELementById won't work because I haven't made an id, but how do I do that without having image f showing? Any help is appreciated.

Seems you're missing html
Try add f html element for work:
<img src="images/f.jpg" id="f">

The p tag in the html is talking about c.jpg, d.jpg and e.jpg.
Its not talking about f.jpg, you may want to check that
with the assumption that it is e.jpg and not "f.jpb". And also assuming that you have e.jpg in your images folder. Below code will work fine (small modification in the script)
function swap() {
if (Math.random()>.5){
// document.getElementById("c").style.display = 'none';
document.getElementById("c").src = "images/e.jpg";
} else {
// document.getElementById("d").style.display = 'none';
document.getElementById("d").src = "images/e.jpg";
}
}

Related

p5 setVoice not working

while trying to change the voices in the p5.speech, setVoice function just not working at all...
I've been tried both string and index, but still went wrong, is there anyone can help? I would be really appreciated!!
Thanks!
<html>
<head>
<script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/0.4.5/p5.min.js">
</script>
<script
src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/0.4.5/addons/p5.dom.js">
</script>
<script src="p5.speech.js"></script>
<script
src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js">
</script>
</head>
<body>
<button id='talks'>
click to talk
</button>
<script>
$('#talks').click(function(){
console.log('hi')
var talk= new p5.Speech()
talk.onLoad=Voices
function Voices(){
talk.listVoices()
talk.setVoice('Google UK English Male')
}
talk.speak("What's up")}
</script>
</body>
</html>
below is the output of talk.listVoices() :
enter image description here
Firstly my answer is not the full solution, but there are some simple SyntaxErrors in your example. Thats why it's not runable for me at all.
You are opening click( but didn't close it, for better clearance i reformatted your code and added the closing bracket.
A function normally get's called with brackets, so it should be Voices();
This is not necessary for every Browser, but normally an ending line in JavaScript get's an ;
$('#talks').click(
function(){
console.log('hi');
var talk= new p5.Speech();
talk.onLoad=Voices();
function Voices(){
talk.listVoices();
talk.setVoice('Google UK English Male');
}
talk.speak("What's up");
}
)
With that changes i get an console output like this:
VM43:3: hi
p5.speech.js:136 p5.Speech: voices not loaded yet!
p5.speech.js:89 p5.Speech: voices loaded!

How to insert image in xhtml?

I have saved the image in img folder under WebContent in eclipse. How to insert the image into xhtml code?
<img border="0" src="/WebContent/img/si.jpg"></img>
XHTML5. Do not use the border attribute on an image element, it's invalid/legacy. Use CSS with a selector to choose either the specific image or a set of images using a CSS class. Not sure if you're serving the correct media type/mime for XHTML5, the XML parser is superior though if you're not serving the correct media type/mime you'll get stuck with the lazy HTML parser instead. You can also use JavaScript's insertBefore method if you don't want to add the image to the end of the element after all of it's child elements.
<?php
if (isset($_SERVER['HTTP_ACCEPT']) && stristr($_SERVER['HTTP_ACCEPT'],'application/xhtml+xml'))
{
header('Content-Type: application/xhtml+xml; charset=UTF-8');
echo '<?xml version="1.0" encoding="UTF-8"?>'."\n";
}
else
{
header('Content-Type: text/html; charset=UTF-8');
}
?><!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
<title>Moderation</title>
<script defer="true" type="application/javascript">
//<![CDATA[
function image(img)
{
var img = document.createElement('img');
img.setAttribute('alt','Alternative Text');
img.setAttribute('src',img);
document.getElementById('example').appendChild(img);}
window.onload = function(e)
{
//Anonymous function for onload event allows you to call multiple functions.
//Always have event handlers at the end (bottom) of your JavaScript.
//Never put script elements in the body, use the defer or async attributes.
image('images/si.jpg');
}
//]]>
</script>
</head>
<body>
<div id="example"></div>
</body>
</html>

Thymeleaf th:inline="javascript" issue

I don't know how to solve the following: I'd like to let my Model generate real javascript dynamically based on some model logic.
This final piece of javascript code then should be added inside the $(document).ready { } part of my html page.
The thing is: If I use inline="javascript", the code gets quoted as my getter is a String (that is how it is mentioned in the Thymeleaf doc but it's not what I need ;-)
If I use inline="text" in is not quoted but all quotes are escaped instead ;-) - also nice but unusable 8)
If I try inline="none" nothing happens.
Here are the examples
My model getter created the following Javascript code.
PageHelper class
public String documentReady() {
// do some database operations to get the numbers 8,5,3,2
return "PhotoGallery.load(8,5,3,2).loadTheme(name='basic')";
}
So if I now try inline="javascript"
<script th:inline="javascript">
/*<![CDATA[*/
jQuery().ready(function(){
/*[[${pageHelper.documentReady}]]*/
});
/*]]>*/
</script>
it will be rendered to
<script>
/*<![CDATA[*/
jQuery().ready(function(){
'PhotoGallery.load(8,5,3,2).loadTheme(name=\'basic\')'
});
/*]]>*/
</script>
Which doesn't help as it is a String literal, nothing more (this is how Thymeleaf deals with it).
So if I try inline="text" instead
<script>
/*<![CDATA[*/
jQuery().ready(function(){
PhotoGallery.load(8,5,3,2).loadTheme(name='basic')
});
/*]]>*/
</script>
Which escapes the quotes.
inline="none" I do not really understand, as it does nothing
<script>
/*<![CDATA[*/
jQuery().ready(function(){
[[${pageHelper.documentReady}]]
});
/*]]>*/
</script>
To be honest I have no idea how to solve this issue and hopefully anybody out there knows how to deal with this.
Many thanks in advance
Cheers
John
I would change the approach.
Thymeleaf easily allows you to add model variables in your templates to be used in Javascript. In my implementations, I usually put those variables somewhere before the closing header tag; to ensure they're on the page once the JS loads.
I let the template decide what exactly to load, of course. If you're displaying a gallery, then render it as you would and use data attributes to define the gallery that relates to some JS code. Then write yourself a nice jQuery plugin to handle your gallery.
A relatively basic example:
Default Layout Decorator: layout/default.html
<!doctype html>
<html xmlns:layout="http://www.thymeleaf.org" xmlns:th="http://www.thymeleaf.org">
<head>
<title>My Example App</title>
<object th:remove="tag" th:include="fragments/scripts :: header" />
</head>
<body>
<div layout:fragment="content"></div>
<div th:remove="tag" th:replace="fragments/scripts :: footer"></div>
<div th:remove="tag" layout:fragment="footer-scripts"></div>
</body>
</html>
The thing to notice here is the inclusion of the generic footer scripts and then a layout:fragment div defined. This layout div is what we're going to use to include our jQuery plugin needed for the gallery.
File with general scripts: fragments/scripts.html
<div th:fragment="header" xmlns:th="http://www.thymeleaf.org">
<script type="text/javascript" th:inline="javascript">
/*<![CDATA[*/
var MY_APP = {
contextPath: /*[[#{/}]]*/,
defaultTheme: /*[[${theme == null} ? null : ${theme}]]*/,
gallery: {
theme: /*[[${gallery == null} ? null : ${gallery.theme}]]*/,
images: /*[[${gallery == null} ? null : ${gallery.images}]]*/,
names: /*[[${gallery == null} ? null : ${gallery.names}]]*/
}
};
/*]]>*/
</script>
</div>
<div th:fragment="footer" xmlns:th="http://www.thymeleaf.org">
<script type="text/javascript" src="/js/jquery.js"></script>
<script type="text/javascript" src="/js/my_app.js"></script>
</div>
In the scripts file, there are 2 fragments, which are included from the decorator. In the header fragment, a helpful context path is included for the JS layer, as well as a defaultTheme just for the hell of it. A gallery object is then defined and assigned from our model. The footer fragment loads the jQuery library and a main site JS file, again for purposes of this example.
A page with a lazy-loaded gallery: products.html
<html layout:decorator="layout/default" xmlns:layout="http://www.thymeleaf.org/" xmlns:th="http://www.thymeleaf.org">
<head>
<title>Products Landing Page</title>
</head>
<body>
<div layout:fragment="content">
<h1>Products</h1>
<div data-gallery="lazyload"></div>
</div>
<div th:remove="tag" layout:fragment="footer-scripts">
<script type="text/javascript" src="/js/my_gallery.js"></script>
</div>
</body>
</html>
Our products page doesn't have much on it. Using the default decorator, this page overrides the page title in the head. Our content fragment includes a title in an h1 tag and an empty div with a data-gallery attribute. This attribute is what we'll use in our jQuery plugin to initialize the gallery.
The value is set to lazyload, so our plugin knows that we need to find the image IDs in some variable set somewhere. This could have easily been empty if the only thing our plugin supports is a lazyloaded gallery.
So the layout loads some default scripts and with cleverly placed layout:fragments, you allow certain sections of the site to load libraries independent of the rest.
Here's a basic Spring controller example, to work with our app: MyController.java
#Controller
public class MyController {
#RequestMapping("/products")
public String products(Model model) {
class Gallery {
public String theme;
public int[] images;
public String[] names;
public Gallery() {
this.theme = "basic";
this.images = new int[] {8,5,3,2};
this.names = new String[] {"Hey", "\"there's\"", "foo", "bar"};
}
}
model.addAttribute("gallery", new Gallery());
return "products";
}
}
The Gallery class was tossed inline in the products method, to simplify our example here. This could easily be a service or repository of some type that returns an array of identifiers, or whatever you need.
The jQuery plugin that we created, could look something like so: my_gallery.js
(function($) {
var MyGallery = function(element) {
this.$el = $(element);
this.type = this.$el.data('gallery');
if (this.type == 'lazyload') {
this.initLazyLoadedGallery();
}
};
MyGallery.prototype.initLazyLoadedGallery = function() {
// do some gallery loading magic here
// check the variables we loaded in our header
if (MY_APP.gallery.images.length) {
// we have images... sweet! let's fetch them and then do something cool.
PhotoGallery.load(MY_APP.gallery.images).loadTheme({
name: MY_APP.gallery.theme
});
// or if load() requires separate params
var imgs = MY_APP.gallery.images;
PhotoGallery.load(imgs[0],imgs[1],imgs[2],imgs[3]).loadTheme({
name: MY_APP.gallery.theme
});
}
};
// the plugin definition
$.fn.myGallery = function() {
return this.each(function() {
if (!$.data(this, 'myGallery')) {
$.data(this, 'myGallery', new MyGallery(this));
}
});
};
// initialize our gallery on all elements that have that data-gallery attribute
$('[data-gallery]').myGallery();
}(jQuery));
The final rendering of the products page would look like so:
<!doctype html>
<html>
<head>
<title>Products Landing Page</title>
<script type="text/javascript">
/*<![CDATA[*/
var MY_APP = {
contextPath: '/',
defaultTheme: null,
gallery: {
theme: 'basic',
images: [8,5,3,2],
names: ['Hey','\"there\'s\"','foo','bar']
}
};
/*]]>*/
</script>
</head>
<body>
<div>
<h1>Products</h1>
<div data-gallery="lazyload"></div>
</div>
<script type="text/javascript" src="/js/jquery.js"></script>
<script type="text/javascript" src="/js/my_app.js"></script>
<script type="text/javascript" src="/js/my_gallery.js"></script>
</body>
</html>
As you can see, Thymeleaf does a pretty good job of translating your model to valid JS and actually adds the quotes where needed and escapes them as well. Once the page finishes rendering, with the jQuery plugin at the end of the file, everything needed to initialize the gallery should be loaded and ready to go.
This is not a perfect example, but I think it's a pretty straight-forward design pattern for a web app.
instead of ${pageHelper.documentReady} use ${pageHelper.documentReady}

Responsive Picture Element still working even after being removed from DOM in Chrome Browser

Can anyone explain why the responsive picture image is still firing using Chrome Canary 42.0.2302.2 after it has been removed (works as expected in IE11 and FF 35.0.1 - in Chrome 40.0.2214.111 m it is broken, but interestingly, it also downloaded both images straight away!).
To test, open the test page with Chrome Dev Tools open on the Network tab. Take note of the image that has been displayed. Tap anywhere on the page to empty the content. Now resize the page and note that the other images are downloaded despite the picture element being removed from the page.
<!DOCTYPE html>
<html>
<head>
<title>Test Picture Element</title>
<meta charset="utf-8">
</head>
<body>
<picture>
<source srcset="http://placehold.it/768/f00/fff" media="(max-width: 768px)">
<source srcset="http://placehold.it/992/0f0/fff" media="(max-width: 992px)">
<img srcset="http://placehold.it/1200/00f/fff">
</picture>
</body>
<script src="https://code.jquery.com/jquery-2.1.3.min.js"></script>
<script type="text/javascript">
$(function(){
$('body').on('click', function() {
$('body').empty();
});
});
</script>
</html>
JSFiddle for your convenience: http://jsfiddle.net/5qwLus59/4/
Because Mutations aren't set up correctly in Chrome. It's similar to how people sometimes write their JS code.
For example:
$('.nav').each(function(){
var $nav = $(this);
var sizeNav = function(){
//some code
};
$(window).on('resize', sizeNav);
});
In fact they should do something like this:
$('.nav').each(function(){
var $nav = $(this);
var sizeNav = function(){
//some code
};
$(window).on('resize', sizeNav);
$nav.on('remove', function(){
//destroy code
$(window).off('resize', sizeNav);
});
});
This is a serious issue, please report this!:
https://code.google.com/p/chromium/issues

having trouble running a fadein-fadeout Image banner

I am new in jquery I desperately need some help in running this code.I am trying to create a fade in-fade out image banner with 4 images within div tag, with the help of a function fadingbanner() which calls itself recursively and is initiated by a settimeout function.But for some reason its not working.Please help....
<HTML>
<HEAD>
<script type= "text/javascript" src="C:\Documents and Settings\A\Desktop\jquery-1.9.1.js"></script>
<SCRIPT>
<div>
<img src = "C:\Documents and Settings\A\Desktop\web_files\temp1.jpg" id = "i1">
<img src = "C:\Documents and Settings\A\Desktop\web_files\temp2.jpg" id = "i2">
<img src = "C:\Documents and Settings\A\Desktop\web_files\temp3.jpg" id = "i3">
<img src = "C:\Documents and Settings\A\Desktop\web_files\temp4.jpg" id = "i4">
</div>
function fadingbanner()
{
$(document).ready(function(){
$("#i1").fadeOut(2000,function(){
$("#i2").fadeIn(2000,function(){
$("#i2").fadeOut(2000,function(){
$("#i3").fadeIn(2000,function(){
$("#i3").fadeout(2000,function(){
$("#i4").fadeIn(2000,function(){
$("#i4").fadeout(2000,function(){
fadingbanner();
});
});
});
});
});
});
});
}
</SCRIPT>
</HEAD>
<BODY>
<IMG NAME = "bannerimage" src = "C:\Documents and Settings\A\Desktop\web_files\temp1.jpg" height = "200" width = "600" onload = "settimeout("fadingbanner()",1000)">
</BODY>
</HTML>
Take out the function and it should work ok. It is only defining a function and never running it. If it did run it, all it would do is schedule the code to run when the document finishes loading.
You also want to hide all but the first picture at the start.
So it should be like:
$(document).ready(function(){
$("#i2, #i3, #i4").hide();
$("#i1").fadeOut(2000,function(){
... all that other stuff
});
});
Here is a fiddle showing it: http://jsfiddle.net/ePBkX/1/
I borrowed the pictures there from the fiddle attached to this, which you might want to read: jQuery fade out then fade in

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