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Image change depending to dropdown value change?

I am using Templating Example of select2 library. When first time I change dropdown value it works and preview correct image, but second time, it appends second image and do not place first image.
Js:
$(document).ready(function () {
$('select#event_palette').change(function () {
var selectVal = 'res/img/Palette/' + $(this).val() + '-md.jpg';
$("#app-bg").append("<img src='"+ selectVal + "'></img>");
// $("#app-bg").remove();
});
});

You are appending new image to same node replace it to make it work.
$(document).ready(function () {
$('select#event_palette').change(function () {
var selectVal = 'res/img/Palette/' + $(this).val() + '-md.jpg';
$("#app-bg").html("<img src='"+ selectVal + "'></img>");
});
});

use html() instead of append().
$(document).ready(function () {
$('select#event_palette').change(function () {
var selectVal = 'res/img/Palette/' + $(this).val() + '-md.jpg';
$("#app-bg").html("<img src='"+ selectVal + "'></img>");
});
});

Can't target JSON-created block

For some reason I'm having a hard time implementing draggable (either jquery's or draggabilly) on JSON/jquery-created elements.
This is my jQuery along with the JSON.
var setTotal = function (){
var total = 0;
$('.block').each(function(){
total = total+parseInt($(this).data('cost'));
});
$('.totalSum').html(total);
};
window.onload = function(){
$.getJSON( "ajax/test.json", function( data ) {
$.each( data.createButton, function( key, val ) {
var button = $('<button class="btn" id="' + val.name +'" style="background: ' + val.color + '">' + val.name + '</button>');
button.on("click", function(){
//console.log("button " + val.name + " was clicked!");
var block = $('<div id="draggable" class="block ' + val.name + '-piece">'+ val.name + '<div class="close">-</div></div>');
block.data('cost', val.cost);
block.on("click", ".close", function(){
$(this).parent().remove();
// call set total to refresh it when item is removed
setTotal();
});
$('#boxes').append(block);
// call set total to calculate total blocks' cost
setTotal();
});
$('#field').append(button);
});
});
};
and this is how it's called in the html document;
<!-- Grab Google CDN's jQuery -->
<script src="https://code.jquery.com/jquery-2.1.4.min.js" type="text/javascript"></script>
<!-- Grab draggable -->
<script src="//cdnjs.cloudflare.com/ajax/libs/draggabilly/1.2.0/draggabilly.pkgd.min.js"></script>
<!-- My own scripts -->
<script src="js/main.js" type="text/javascript"></script>
<script>
var $draggable = $('#draggable').draggabilly({
// options...
});
</script>
<!-- End scripts -->
Now for some reason I can't target the ID (for testing only) nor the class (block) of the block variable. Does anyone know why? The draggable works fine with any other element on the page.
Sincerely, Sebastian

Two things :
you are appending multiple elements with id="draggable". Ids should be unique.
there's no evidence of invoking draggabilly on the appended elements.
Draggabilly needs to be invoked on :
any blocks that already exist on page load
dynamically created blocks after they have been appended
Personally, I would write the code something like this :
window.onload = function() {
var draggabilly_options = {
// options...
};
function create_button(key, val) {
$('<button/>', {
'id': val.name,
'class': 'btn',
'style': 'background-color:' + val.color,
'html': val.name,
})
.appendTo("#field")
.on('click', create_block.bind(val));
}
function create_block() {
$('<div/>' {
'class': 'block ' + this.name + '-piece',
'html': this.name + '<div class="close">-</div>'
})
.appendTo('#boxes')
.draggabilly(draggabilly_options) //invoke draggabilly on the div.block just added
.data('cost', this.cost)
.find('.close')
.on('click', close);
}
function close() {
$(this).closest(".block").remove();
setTotal();
}
function setTotal() {
var total = 0;
$(".block").each(function() {
total += parseInt($(this).data('cost'));
});
$('.totalSum').html(total);
};
$.getJSON( "ajax/test.json", function(data) {
$.each(data.createButton, create_button);
setTotal();
});
//You need this only if the page loads with any "draggable" blocks already in place.
$("#boxes .block").draggabilly(draggabilly_options);
};

Thank you for all responses. I took some advice from your code you published and put it like this;
// Start this after window is loaded
window.onload = function(){
// Init draggabilly
var draggabilly_options = {
// Dragabilly options
containment: '#boxes',
grid: [ 100, 100 ]
};
and also defined it further down in the button click function like so;
button.on("click", function(){
var block = $('<div id="block-' + val.id + '" class="block ' + val.name + '-piece"></div>');
var close = $('<div class="close">-</div>');
$(block).append(close);
block.data('cost', val.cost);
block.draggabilly(draggabilly_options);
This appeared to solve it for me! Thank you for the help and answers, they solved my problem :)

jQuery - click on a link dynamically generated by AJAX

I read many different posts about this matter but I can't solve my problem.
I am trying to create a simple lightbox on dynamically generated content.
$(document).ready(function() {
$("body").on("click", "button", function() {
$("button").removeClass("selected");
$(this).addClass("selected");
var flickrAPI = "http://api.flickr.com/services/feeds/photos_public.gne?jsoncallback=?";
var animal = $(this).text();
var flickrOptions = {
tags : animal,
format: "json"
};
var displayPhotos = function(data) {
var photoHTML = "<ul>";
$.each(data.items, function(i, photo) {
photoHTML += '<li class="grid-25 tablet-grid-50">';
photoHTML += '<a href="' + photo.link + '" class="image">';
photoHTML += '<img src="' + photo.media.m + '" ></a></li>';
});
photoHTML += '</ul>';
$('#photos').html(photoHTML);
}
$.getJSON(flickrAPI, flickrOptions, displayPhotos);
var $overlay = $('<div id="overlay"></div>');
var $image = $("<img>");
var $caption = $("<p></p>");
//An image to overlay
$overlay.append($image);
//A caption to overlay
$overlay.append($caption);
//Add overlay
$("body").append($overlay);
//Capture the click event on a link to an image
$("#photos a").click(function(event){
event.preventDefault();
var imageLocation = $(this).attr("href");
//Update overlay with the image linked in the link
$image.attr("src", imageLocation);
//Show the overlay.
$overlay.show();
//Get child's alt attribute and set caption
var captionText = $(this).children("img").attr("alt");
$caption.text(captionText);
});
//When overlay is clicked
$overlay.click(function(){
//Hide the overlay
$overlay.hide();
});
});
});
Here is my complete code on jsfiddle
The click event after the AJAX call doesn't fire up.
How can I solve this?

what it's happening its that you are adding the event before the DOM exists, what you should do its wait for the response to actually render all the event and the interface or replace this:
$("#photos a").click(function(event){
});
for
$(document).on("click","#photos a",function(){
});
that way the event its gonna exist always... Its my guess... I'm not sure if $("#photos a") actually get the element you want to attach the event, but you got the idea of how you can add event to DOM elements that still dont exist on the DOM.

Jquery previous .html() element still showing when new element clicked

I have to write code which finds all anchors and attaches a function that displays a popup of the elements text. My code is probably a mess, but I was able to get it working however the issue I have now is:
If I click link 1, then link 2, then click link 1 again, it displays link 2's text however if i click it again it displays the correct text.
I am not sure exactly how to rewrite or go about fixing this code to properly display the element which is clicked, text all the time.
here is a jsfiddle example: http://jsfiddle.net/2aLfL/1/
$(document).ready(function() {
function deselect(e) {
$('.pop').slideFadeToggle(function() {
e.removeClass('selected');
});
}
$(function() {
$('a').click(function(){
if($(this).hasClass('selected')){
deselect($(this));
} else {
$(this).addClass('selected');
$('.pop').slideFadeToggle();
var elText = $(this).text();
$('#elPop').html("<p>" + "<br><br>" + "You just clicked: <br><b>" + elText + "</b><br><br><br>" + "Click anywhere to Close" + "</p>");
console.log(this);
$("#closeWin").click(function () {
$('.anchorpop').hide();
});
}
return false;
});
});
$(function close(){
$(document).click(function(){
$('.anchorpop').hide();
});
});
$.fn.slideFadeToggle = function(easing, callback) {
return this.animate({ opacity: 'toggle', height: 'toggle' }, 'fast', easing, callback);
};
});

You're binding the following click handler
$("#closeWin").click(function () {
$('.anchorpop').hide();
});
inside <a> click handler so whenever a link is clicked, multiple handlers are being added.
You can avoid many unnecessary code using toggleClass() method.
You can also bind same event handlers to multiple elements by passing additional selectors.
after all your code boils down to
$(function () {
$('a').click(function () {
var htmlString = "<p>" + "<br><br>" + "You just clicked: <br><b>" + $(this).text() + "</b><br><br><br>" + "Click anywhere to Close" + "</p>"
$('.pop').html(htmlString).slideFadeToggle(function () {
$(this).toggleClass('selected');
});
return false;
});
$("#closeWin, .anchorpop").click(function () {
$('.anchorpop').hide();
});
});
and the custome slideFadeToggle function.
Updated Fiddle

jQuery not behaving as expected in reference to clicks

I have an element that I grab the content of and swap for an input, I then want to user to be able to click on the input (to enter text as normal), but if they click anywhere else to swap it back to the text.
However the click event seems to fire even the very first time the user clicks anywhere on the page. My code is below, have I misunderstood something?
$(document).ready(function(){
$("#thingy").css('cursor', 'pointer');
$("#thingy").one("click", function() {
var element = $(this);
element.css('cursor', 'auto');
element.css('display', 'inline-block');
element.fadeOut(100, function(){element.html('<input type="text" size="25" value="' + element.text() + '" style="width:' + element.width() + 'px;height:' + element.height() + 'px;border:none;padding:0px;margin:0px;">')}).fadeIn(100);
$("#thingy").click(function() {
return false;
});
$(document).click(function() {
alert("You clicked off the text-box");
element.html(element.children('input:text').val());
});
});
});

The reason it alerts even the first time is the first click handler (the .one() doesn't itself return false; or .stopPropgaton(), like this:
$(document).ready(function(){
$("#thingy").css('cursor', 'pointer');
$("#thingy").one("click", function() {
var element = $(this);
element.css('cursor', 'auto');
element.css('display', 'inline-block');
element.fadeOut(100, function(){element.html('<input type="text" size="25" value="' + element.text() + '" style="width:' + element.width() + 'px;height:' + element.height() + 'px;border:none;padding:0px;margin:0px;">')}).fadeIn(100);
$("#thingy").click(function() {
return false;
});
$(document).click(function() {
alert("You clicked off the text-box");
element.html(element.children('input:text').val());
});
return false;
});
}); ​
You can test it out here.
A better approach would be to use the blur event instead, replacing this:
$("#thingy").click(function() {
return false;
});
$(document).click(function() {
alert("You clicked off the text-box");
element.html(element.children('input:text').val());
});
return false;
With this:
$(element).delegate("input", "blur", function() {
element.html(element.children('input:text').val());
});
You can try that version here.