Develop Reference

Attempting to change an image onclick via PHP/Javascript/HTML

I've looked at numerous other answers regarding this but haven't found a solution that has worked. I'm using a PHP page that contains some HTML code, with Javascript working some functions. Ideally I would select an image on the page, the image will become colored green as it is selected. I would then like to deselect the image and have it return to the original state. I can only get half-way there however. What am I missing? Is it something with post back?
Here's some code examples:
The HTML:<div onclick="changeImage(1)" id="toolDiv1"><img id="imgCh1" src="/images/Tooling/1.png"></div>
The Javascript function:
function changeImage(var i){
var img = document.getElementById("imgCh" + i + ".png");
if (img.src === "images/Tooling/" + i + ".png"){
img.src = "images/Tooling/" + i + "c.png";
}
else
{
img.src = "images/Tooling/" + i + ".png";
}
}`
The "1c.png" image is the one that is selected and should replace "1.png". There are multiple divs on this page that hold multiple images, which are named 2/2c, 3/3c, which is why the var i is included. Any insight? Thanks in advance.

You could do it something like this, it would also allow for different file names.
<img class="selectable" src="/images/Tooling/1.png"
data-original-source="/images/Tooling/1.png"
data-selected-source="/images/Tooling/1c.png">
<img class="selectable" src="/images/Tooling/2.png"
data-original-source="/images/Tooling/2.png"
data-selected-source="/images/Tooling/2c.png">
 
var images = document.getElementsByClassName('selectable');
for (var image of images) {
image.addEventListener('click', selectElementHandler);
}
function selectElementHandler(event) {
var image = event.target,
currentSrc = image.getAttribute('src'),
originalSrc = image.getAttribute('data-original-source'),
selectedSrc = image.getAttribute('data-selected-source'),
newSrc = currentSrc === originalSrc ? selectedSrc : originalSrc;
image.setAttribute('src', newSrc);
}
 
With comments:
// find all images with class "selectable"
var images = document.getElementsByClassName('selectable');
// add an event listener to each image that on click runs the "selectElementHandler" function
for (var image of images) {
image.addEventListener('click', selectElementHandler);
}
// the handler receives the event from the listener
function selectElementHandler(event) {
// the event contains lots of data, but we're only interested in which element was clicked (event.target)
var image = event.target,
currentSrc = image.getAttribute('src'),
originalSrc = image.getAttribute('data-original-source'),
selectedSrc = image.getAttribute('data-selected-source'),
// if the current src is the original one, set to selected
// if not we assume the current src is the selected one
// and we reset it to the original src
newSrc = currentSrc === originalSrc ? selectedSrc : originalSrc;
// actually set the new src for the image
image.setAttribute('src', newSrc);
}

Your problem is that javascript is returning the full path of the src (you can try alert(img.src); to verify this).
You could look up how to parse a file path to get the file name in javascript, if you want the most robust solution.
However, if you're sure that all your images will end in 'c.png', you could check for those last 5 characters, using a substring of the last 5 characters:
function changeImage(var i){
var img = document.getElementById("imgCh" + i);
if (img.src.substring(img.src.length - 5) === "c.png"){
img.src = "images/Tooling/" + i + ".png";
}
else
{
img.src = "images/Tooling/" + i + "c.png";
}
}

Populate an input field with an image src in javascript

I have an XHR response that returns images. I have my function in order to show the images. I am combining JQuery and JS in the same code snippet. So far all is working well:
function resultat(o){
var leselements = o.query.results.bossresponse.images.results.result;
var output = '';
var no_items = leselements.length;
for(var i=0;i<no_items;i++){
var lien = leselements[i].url;
//place image urls in img src
output += "<img src='" + lien + "' class='imgs'>";
}
// Place images in div tag
document.getElementById('results').innerHTML = output;}
But I would like to allow users to click an image and then populate an input field ('#imageurl') with the clicked image src. Here is what I tried but it does not work.
$('.imgs img').click(function(){
$('#imageurl').val() = "";
var source = $(this).attr('src');
$('#imageurl').val() = source;
});
Any help will be greatly appreciated. TIA.

Using .val() in this way will just return the current value of #imageurl.
$('#imageurl').val()
.val is a function call that works as a getter and a setter.
To set the value, try this:
$('#imageurl').val(source);

$('#imageurl').val("");
// ...
$('#imageurl').val(source);
See the documentation.

Try this:
$('img.imgs').click(function(){
var src = $(this).attr('src');
$('#imageurl').val(src);
});
If the image will be rendered after the attachment of the event handler use this:
$('img.imgs').live('click', function(){
var src = $(this).attr('src');
$('#imageurl').val(src);
});

Thank you guys for your prompt answers. I tried all of them but they did not work for me. I then asked a friend and we finally found a way to make it work. Probably not the best or professional way but it works. Here is the solution if ever anyone needs it.
function resultat(o){
var leselements = o.query.results.bossresponse.images.results.result;
var output = '';
var no_items = leselements.length;
for(var i=0;i<no_items;i++){
var link = leselements[i].url;
//Place urls in image src and pass in 'link' parameter to the getsrc function
output += "<img src='" + link + "' onclick='getsrc(\""+link+"\")'>";
}
// Place images in div tag
document.getElementById('results').innerHTML = output;
}
function getsrc (link) {
//console.log($(this));
$('#imageurl').val("");
// var source = $(this).attr('src');
//place imageurl value by passing in the link parameter.
$('#imageurl').val(link);
}

how to get photo compleet url form form in array

I am trying to use jquery to take a picture from my comp via a form.
- So I want the entire URL out of the form in an array
It works + / - in Dreamweaver, but not in the explorer browsers not even chrome
The end goal is a calendar with picture / app for people with disabilities, but as long as I get to go through the phone gap
var foto= new Array();
var i=-1;
//foto=["toets.png"];
$('#fotouit').append("FOTO UIT");
$('#knop01').click(function(){
$('input:file[name=foto]').each(function(){
//alert($(this).val());
foto.push($(this).val());
foto.forEach( function(){
i++;
$('#fotouit').append(foto[i]);
$('#fotouit').append('<img src=" '+ foto[i] + ' " width="100" height="100" />');
});
});
})

I don't think it is possible to get the URL of the picture in you computer's local filesystem, but you can use Javascript's FileReader API to read the contents of the uploaded file (in your case, the picture). The read contents can be used in the src of the img element as you did in your example code.

This is an in depth explanation of what you're trying to accomplish: https://developer.mozilla.org/en-US/docs/Using_files_from_web_applications
Example:
function handleFiles(files) {
for (var i = 0; i < files.length; i++) {
var file = files[i];
var imageType = /image.*/;
if (!file.type.match(imageType)) {
continue;
}
var img = document.createElement("img");
img.classList.add("obj");
img.file = file;
preview.appendChild(img); // Assuming that "preview" is a the div output where the content will be displayed.
var reader = new FileReader();
reader.onload = (function(aImg) { return function(e) { aImg.src = e.target.result; }; })(img);
reader.readAsDataURL(file);
}
}
Note:
You can use the multiple attribute on a file input to allow selecting many files with one input
You can use the file inputs change event to immediately capture the files rather than providing a second button to click

get name of files in a folder with javascript

I have a background image folder that there is some picture that i want to use them for background.
how i can get their names and put them on array whit javascript?if i cant they do with javascript,how can i do that?
i want to read name of files and use javacsript and link for change background image whit css.
<script>
function nextbg(){
$('#bg').css('background-image','url(Images/bg2.jpg)');
}
</script>

This solution is created according to the fact that browser dont have access to folders/filesystem.
Javascript can not access the filesystem. This has to be done by a server script and then be feed to the javascript.
I had the simliar problem when building my game engine when I was loading all my diffrent tiles. I ended up doing it like this.
This solution do pose two a problems when implementing it.
You will have to define the amout of images in the "NrofTiles" array
The images must be named like tile1, tile2 ... tile9 so you can
increment the path to them.
The typeOfTiles[typeCounter] is just there to give me access to different folders, in my case for my tiles, grass, houses, water and so on.
for(var i = 0; i <= nrofTiles.length; i++)
{
for(var x = 0; x <= nrofTiles[i]; x++)
{
console.log
("Fetching tile "+(x + 1 )+" of " + 14);
img = new Image();
//My path
img.src = 'Images/Cart/' + typeOfTiles[typeCounter] + '/' + (x + 1) + '.png';
imgArray.push(img);
var intervalFunctionen = function () {
alert("calls back here");
};
}//end for loop!
}end outer for loop!
When everything is loaded(the tiles), you do this to change the background picture.
This is an example of a changing body background. You could make a link with an ID lets say "iamthelink".
HTML
Change BG
JAVASCRIPT
var link = document.getElementsById('iamthelink');
link.onclick= function() {
var body = document.getElementsByTagName('body')[0];
body.style.backgroundImage = 'url(http://localhost/background.png)';
}

how to load a picture from .js file to html?

I have a file called src.js which has all the scripts for my html page.
now on my html page I am using this :
<script language="javascript" src="src.js">
</script>
to call the .js file to use it.
I am not sure how to set up the images links in the .js file or how to call them in the .html file
I need a simple answer please :)

You need to have a placeholder for your images in the HTML otherwise you would need to dynamically modify the HTML DOM structure.
As for using variables for image links, refer to the code below which pre-loads the images.
if (document.images)
{
preload_image_object = new Image();
// set image url
image_url = new Array();
image_url[0] = "http://mydomain.com/image0.gif";
image_url[1] = "http://mydomain.com/image1.gif";
image_url[2] = "http://mydomain.com/image2.gif";
image_url[3] = "http://mydomain.com/image3.gif";
var i = 0;
for(i=0; i<=3; i++)
preload_image_object.src = image_url[i];
}
The browser must have the document.images attribute defined.

<div id="_images"></div>
<script>
var images = { // images with properties
image1 : {url:'http://image1',property:'value'},
image2 : {url:'http://image2',props:[],else:'val'}
}
for(var i in images){
var image = new Image();
image.src = images[i].url;
// put image anywhere you want
document.getElementById('_images').appendChild(image)
}
</script>