Fellow Programmers! A wonderful afternoon (or whatever the case) to you!
With some assistance of fellow users I was able to manage getting an image to change back and forth between a second image every couple seconds. It's awesome! So I counted out some of the math with the % operator, and sure enough when the image first displays, I get the default broken link image of the browser, but after the 2 seconds everything goes as planned.
So begins this investigative experiment.
I decided instead of swapping automatically, lets make the swap with a button as to be able to investigate the page as long as I would like. But who want's to do the exact same thing again, why not learn another cool trick along the way. That trick is to display both of the images at the same time, such that when the button is clicked they swap places. Same math, different effect for the user. Isn't that awesome!
The goal:
display two images and below them one button. When the button is clicked the images are to swap places. The images that was on the left should be on the right, the one on the right ought now be on the left. Use no jQuery, this is after all a JavaScript experiment (and I have yet to learn much jQuery but I can't wait to get there!)
Browser error console messages:
Interestingly enough firefox give me nothing. I open the browser, load the page in it from VS 2012 clear the error conslole, refresh the page. And nothing.
In chrome (my default browser) however, I get a localhost pic src 404 not found.
I find this strange because this code is on a page that happens to have other code which references those same pictures and works fine. The 2 second auto img flip thing being some of that other code.
debugging:I'm to much of a noob to know what's going on with that. I get the basic Idea and looked into it some. On the VS site there's all this info about setting breaking points and running multiple instance of VS to do something with another engine. I will soon be on youtube to hammer that out. I apologize however, if there is some simple debug fix to this and I should have witnessed it. Hammering through my 2nd web class and that topic has not been covered :(
Here are articles that I found similar to my question.
This was helpful to see how they had set up the if else:
https://stackoverflow.com/questions/15671442/swap-image-with-onclick-not-responding
all in all that turned out to be more that I could read, clearly the writer is more advanced than I.
a second: javascript swap text block onclick anchor link a bit of an information overload I think. There was a lot going on with that, but I never managed to change any of my code after reading through it.
If your curious here is the VS article I briefly mentioned:
http://blogs.msdn.com/b/visualstudioalm/archive/2013/06/28/javascript-native-interop-debugging-in-visual-studio-2013.aspx
And here is my code:
<script type="text/javascript">
function swap_pics() {
var c = 1
//I had:
//var andy_arr = ["andy_white.jpg","andy_black.jpg"];
var andy_src1 = "andy_left.jpg";
var andy_src2 = "andy_right.jpg";
c = ((c + 1) % 2);
if (c == 0) {
//I was using an array which looked like:
// document.getElementById('andy_left').src = "andy_arr[0]";
// document.get ... _right').src = andy_arr[Math.abs(c-1)];
//0-1 abs = 1
//1-1 = 0, so It looks like it should now toggle.
document.getElementById('andy_left').src = andy_src1;
document.getElementById('andy_right').src = andy_src2;
}
else {
document.getElementById('andy_left').src = andy_src2;
document.getElementById('andy_right').src = andy_src1;
}
}
</script>
<div id="mini_lab_5">
<img src=""
id="andy_left"
height="100"
width="100"
/>
<img src=""
id="andy_right"
height="100"
width="100"
/>
<br />
<input type="button" value="Swap"
onclick="swap_pics();
"/>
</div>
Thanks for being a part of the community and making it great!
You could add the images directly to your img tags like this :
<img src="andy_left.jpg"
id="andy_left"
height="100"
width="100"
/>
<img src="andy_right.jpg"
id="andy_right"
height="100"
width="100"
/>
Then your images should appear by default in your page, if not your links to the images are not good.
Then you could replace your current swap_pics function with the following :
function swap_pics() {
var andy_left = document.getElementById('andy_left'),
andy_right = document.getElementById('andy_right'),
andy_left_src = andy_left.src,
andy_right_src = andy_right.src;
andy_left.src = andy_right_src;
andy_right.src = andy_left_src;
}
Here is a simple jsfiddle doing this: http://jsfiddle.net/X9YTP/
Here you go good luck.
<html>
<head>
<script type="text/javascript">
function switchImage () {
var imgleft = document.getElementById('image1'),
imgright = document.getElementById('image2'),
img_left_src = imgleft.src,
img_right_src = imgright.src;
imgleft.src = img_right_src;
imgright.src = img_left_src;
}
</script>
</head>
<body>
<div>
<img id="image1" src="./home-cat.jpg" />
<button id="butnum" onclick="switchImage();">Switch</button>
<img id="image2" src="./images.jpeg" />
</div>
</body>
</html>
Related
I've been working on trying to get these buttons to change when clicked - which now works, but now I need them to toggle between the on and off states when the user clicks (so they can turn the buttons on and off). I'm sure this is an easy fix, but I'm new to Javascript and I don't have anyone to bounce ideas off of.
<html>
<head>
<script type="text/javascript">
function changeimage(img, new_src)
{
var cur_src = img.src.substring(img.src.lastIndexOf("/")+1);
if (cur_src == new_src)
{
img.src = img.old_src;
}
else
{
img.old_src = cur_src;
img.src = new_src;
}
}
</script>
</head>
<body>
<img onclick="changeimage(this, 'images/buttonA_on.png')" src="images/buttonA_off.png" />
<img onclick="changeimage(this, 'images/buttonB_on.png')" src="images/buttonB_off.png" />
<img onclick="changeimage(this, 'images/buttonC_on.png')" src="images/buttonC_off.png" />
<img onclick="changeimage(this, 'images/buttonD_on.png')" src="images/buttonD_off.png" />
<img onclick="changeimage(this, 'images/buttonE_on.png')" src="images/buttonE_off.png" />
<img onclick="changeimage(this, 'images/buttonF_on.png')" src="images/buttonF_off.png" />
</body>
</html>
Much thanks!
When I started using JavaScript I wasted a bunch of time trying to do things that other libraries could easily take care of for me. A few months after that I discovered jQuery which has drastically reduced the amount of time I spend on front-end projects. All you have to do is include the jQuery file in an html project and you're good to go.
In jQuery, you can toggle a class on and off with one line. it looks something like this:
$('.toggleimage').toggleClass('on');
In the above example, '.toggleimage' is just a class I gave to a div, toggleClass is the jQuery command, and 'on' is the name of the class I want to toggle. This probably seems like greek right now, but I recommend going through codeschool's jQuery tutorials to get caught up. If you're thinking of doing serious web development... it's a crucial tool. Here is the full code:
link to full code on my Gist
In order to make it work, make sure you have the right file structure. Create a folder, then create the html file there. In addition, create three subfolders (one for css, one for images, one for scripts). The css folder holds your style.css, the images folder holds mario.jpg, and the scripts folder contains your jQuery file. You can substitute in any image you want, just make sure the changes are applied to style.css.
function changeImg(img) {
if ( img.src.indexOf("_off") > 0 ) {
img.src = img.src.replace("_off","_on");
}
else {
img.src = img.src.replace("_on","_off");
}
}
it will work if you have 50x2 different images, named "imgName1_uw.jpg", "img1_moored.jpg", "img2_uw.jpg", "img2_moored.jpg", etc.
may be its helps you
so I've been trying to make X and Os for a HTML5/JS course project thinking it would be easy, but have had several days of trouble trying to change an image's source from "Tile.png" to "XX.png". I have found similar threads on the site on very similar problems, but none of them worked for me, they all got the 'rare' error though, so I'm thinking there's a double whammy going on here. Help pls!
Here are the two errors I've seen during the hundreds of attempts using javascript and HTML5 for various attempts.
Uncaught ReferenceError: $ is not defined client.js:102
event.returnValue is deprecated. Please use the standard event.preventDefault() instead.
or
attempt to set image src to null (This showed up in most attempts, the other error is a rare occurrence that shows up when I think I've nailed it.)
-
The code consists of a HTML5 file and a Javascript file which just holds variables that aren't used yet. Here is the problem code showing the javascript function and the HTML button and clicking that runs it. The error pops up when the button is clicked, so I believe the code is in the javascript part.
<script>
function YUNOCHANGE()
{
var img = document.getElementById("tst1");
img.src = "Images/XT.png";
}
</script>
<button onclick="YUNOCHANGE();" type="button" id="tst1" name="One" alt="Grey tile" height="175" width="200" style="text-align:center">
<img src="Tile.png"/>
</button>
The Button has no property "src":
<script>
function YUNOCHANGE()
{
var img = document.getElementById("img1");
img.src = "Images/XT.png";
}
</script>
<button onclick="YUNOCHANGE();" type="button" id="tst1" name="One" alt="Grey tile" height="175" width="200" style="text-align:center">
<img id="img1" src="Tile.png"/>
</button>
I am a newbie in javascript and tried a lot of things for hours, but nothing worked.
I will change a big imgage by clicking on a thumbnail.
Untill now I got following script. Not much really... :-(
<script type="text/javascript">
function changeImage() {
document.getElementById("img").src="img/upload/test1.jpg";
}
</script>
<img id="img" name="change" src="img/upload/test.jpg">
<img src="img/thumbnail/test.jpg" alt="" id="imgClickAndChange" onclick="changeImage()">
<img src="img/thumbnail/test1.jpg" alt="" id="imgClickAndChange" onclick="changeImage()">
All big picture are under src"img/upload/xxx.jpg" and all thumbnails under src="img/thumbnail/xxx.jpg". When I click the thumbnail, it have to change the big picture and it have to give the parameter in the javascript. Like onclick="changeImage(xxx.jpg).
The problem is every page have other pictures. I get them from a database. So the name of the picture is like a variable. I hope you understand. It is hard for me to explain. :-(
Thanks for your help in advance.
Greets Yanick
Pass the image parameter to the function like,
function changeImage(image) {
document.getElementById("img").src=image;
}
<img src="img/thumbnail/test.jpg" alt="" id="img"
onclick="changeImage('img/upload/test1.jpg')" />
Keep ids unique. DOM elements "must" possess unique IDs for all practical reasons.
Though you could do an inline onclick, a better way to proceed with it is something as follows.
Assuming you have the images generated from some templating library either on the client or from the server, add data attributes with the image sources and a common class to all of these elements right there and add an event listener from your Javascript bound to elements matching the class and picking up the data attribute to replace the image source.
I am experiencing some problems with my javaScript hover function on two images. When the user hovers over the arrow image it should change into a hover-version of that image, and if the user clicks on it it should start another javascript function to expand/collapse the below tabs. Here is the live site. The problem is with the arrows on the right side below the navigation.
At first I tried doing this with only HTML code (onMouseOver and onMouseOut, and just load different image), but got a nasty bug where if the user hovered over the first arrow, then the second, and back to the first, then the second would completely disappear.
Now I tried with JavaScript instead, but now you can only see the first arrow, and that disappears if you hover to the right of it.
The annoying part is that it works perfectly fine from the local server, but not on the web server. I've not used much HTML/Javascript before, and never used JQuery. If this can be solved easily with something like that, I would be really grateful for some help on how to do so. I've read some solutions with CSS background, but don't think that would work because the image must work as a button as well?
Here is the JS code for changing the images
var images= new Array();
images[0] = "img/ArrowDown.png";
images[1] = "img/ArrowDownHover.png";
images[2] = "img/ArrowUp.png";
images[3] = "img/ArrowUpHover.png";
function DownChange()
{
document.getElementById("expandAll").src = images[1];
}
function DownGoBack()
{
document.getElementById("expandAll").src = images[0];
}
function UpChange()
{
document.getElementById("collapseAll").src = images[3];
}
function UpGoBack()
{
document.getElementById("collapseAll").src = images[2];
}
Here is the HTML code
<div id="collapse">
<img src="img/arrowDown.png" id="expandAll" onMouseOver="DownChange()" onMouseOut="DownGoBack()" onClick="openAll()"></img>
<img src="img/arrowUp.png" id="collapseAll" onMouseOver="UpChange()" onMouseOut="UpGoBack()" onClick="closeAll()"></img>
</div>
If it is working on your local machine, the problem isn't coming from your JS.
The problem I would guess is that your images are not correctly referenced on your web server. Try using explicit paths from the server root on both your local and remote machine, and try to have both machines mirror each other's folder structure.
img tag doesn't have any closing pair like < / img>. try this code
<div id="collapse">
<img src="img/arrowDown.png" id="expandAll" onMouseOver="DownChange();" onMouseOut="DownGoBack();" onClick="openAll();" />
<img src="img/arrowUp.png" id="collapseAll" onMouseOver="UpChange();" onMouseOut="UpGoBack();" onClick="closeAll();" />
</div>
if that doesn't work then try to find if the images are in the correct folder or the names of the images are correct.
Edit:
I used this code and working fine on mozilla firefox and IE 6 -
<script type="text/javascript">
<!--
var images= new Array();
images[0] = "img/ArrowDown.png";
images[1] = "img/ArrowDownHover.png";
images[2] = "img/ArrowUp.png";
images[3] = "img/ArrowUpHover.png";
function DownChange()
{
document.getElementById("expandAll").src = images[1];
}
function DownGoBack()
{
document.getElementById("expandAll").src = images[0];
}
function UpChange()
{
document.getElementById("collapseAll").src = images[3];
}
function UpGoBack()
{
document.getElementById("collapseAll").src = images[2];
}
-->
</script>
<div id="collapse">
<img src="img/arrowDown.png" id="expandAll" onMouseOver="DownChange();" onMouseOut="DownGoBack();" onClick="openAll();" />
<img src="img/arrowUp.png" id="collapseAll" onMouseOver="UpChange();" onMouseOut="UpGoBack();" onClick="closeAll();" />
</div>
Hello,
I do not know very much about javascript, not much at all to be specific, and i'm french (this means sorry for my english).
since i don't know a lot about html and everything, i'm just changing the css and html on tumblr existing theme (i know it's not the very best solution but it's working for me and i'm improving slowly my knowledge about this world)
so in tumblr you have several pages already created like the one that regroup all your post with the same tag, this page is called http://myblog.tumblr.com/tagged/mytag
Here is my problem : i would like to change the header for each of these pages !
I don't have access to the php code (wich seemed to be the best solution...)
here is when i have one header :
<body>
<div id="header">
<img src="{image:Header}"/>
</div>
</body>
i have code the css so that my header looks fine to me
to answer my problem, i tried javascript :
<body>
<div id="header">
<script>
var image = new Array("{image:Header}", "http://static.tumblr.com/my-other-image.jpg")
if(document.URL.indexOf("/") >= 0) {
image.src = "{image:Header}"
}
if(document.URL.indexOf("/tagged/mytag1") >= 0) {
image.src = "http://static.tumblr.com/my-other-image.jpg"
}
</script>
</div>
</body>
obviously it didn't work, and you may be laughing watching what i wrote...
since i only have 3 or 4 pages i'd like to change, i'm ok with the "dirty solution" with too much code, and i just think that i need an "else" for all the other pages !
Thank you for telling me how to make it work and sorry to take some of your time for a simple thing like this wich may not be even possible. and sorry for talking about my life in my terrible english.
Thank you
you must create a image element, then append to the dom:
<body>
<div id="header"></div>
<script>
var uris = ["{image:Header}", "http://static.tumblr.com/my-other-image.jpg"];
var image = document.createElement("img");
if (document.URL.indexOf("/") >= 0) {
image.src = uris[0]
}
if (document.URL.indexOf("/tagged/mytag1") >= 0) {
image.src = uris[1]
}
document.getElementById("header")
.appendChild(image);
</script>
</body>