I need to trigger mousedown event in dynamically changed element. I am making a image galary where if I click on small image then large image should be displayed with high quality image and user can view image by dragging large image in small div. For this is just changing the src of large image container image from jquery. Below is my code:
$(document).on("click", "#thumb_img", function () {
$("#loading").show();
var smallimg = $(this).attr("src");
var img = new Image();
img.src = smallimg.replace('thumbnail/', 'images/');
img.onload = function () {
$(".large-img").prop("src", this.src);
$("#loading").hide();
};
$("img.large-img").css({
width: "500px",
height: "100%",
position: "unset"
});
});
Above code changes the src of large image when small image is clicked and below code is for enabling drag on the large image generated.
var selected = null, // Object of the element to be moved
x_pos = 0, y_pos = 0, // Stores x & y coordinates of the mouse pointer
x_elem = 0, y_elem = 0; // Stores top, left values (edge) of the element
// Will be called when user starts dragging an element
function _drag_init(elem) {
// Store the object of the element which needs to be moved
selected = elem;
x_elem = x_pos - selected.offsetLeft;
y_elem = y_pos - selected.offsetTop;
}
// Will be called when user dragging an element
function _move_elem(e) {
// alert("ASdf");
x_pos = document.all ? window.event.clientX : e.pageX;
y_pos = document.all ? window.event.clientY : e.pageY;
if (selected !== null) {
selected.style.left = (x_pos - x_elem) + 'px';
selected.style.top = (y_pos - y_elem) + 'px';
}
}
// Destroy the object when we are done
function _destroy() {
selected = null;
}
// Bind the functions...
document.getElementById('large-img').onmousedown = function () {
_drag_init(this);
return false;
};
document.onmousemove = _move_elem;
document.onmouseup = _destroy;
This code works fine when page loads first time. Then When I clicked in another small image and It doesn't works.
EDITED
I had mentioned my code in JSFIDDLE. You can see the image is draggable when page loads in large image container but when you click on other thumbnail and try to drag the image in large image container then drag event is not triggering.
position: "unset" is the problem. Removed it and the problem gone.
http://jsfiddle.net/3abLhrep/3/
From your description and code, it looks like you have more than one element with id thumb_img, but IDs must be unique.
Related
I use a Zoom JavaScript for zoom my images when I click on it.
This JavaScript creates a hidden copy of my image with bigger dimensions.
Problem is, when I load my page, the body takes a height and width according to the hidden image.
You can see at the right of the screen the menu doesn't fit with the width of the screen (the hidden image is not displayed).
Is there a solution when I load the page, the size of the body does not take into account the hidden image?
// To achieve this effect we're creating a copy of the image and scaling it up. Next we'll pull the x and y coordinates of the mouse on the original image. Then we translate the big image so that the points we are looking at match up. Finally we create a mask to display the piece of the image that we're interested in.
let settings = {
'magnification': 3,
'maskSize': 200
}
// Once our images have loaded let's create the zoom
window.addEventListener("load", () => {
// find all the images
let images = document.querySelectorAll('.image-zoom-available');
// querySelectorAll produces an array of images that we pull out one by one and create a Zoombini for
Array.prototype.forEach.call(images, (image) => {
new Zoombini(image);
});
});
// A Zoombini (or whatever you want to call it), is a class that takes an image input and adds the zoomable functionality to it. Let's take a look inside at what it does.
class Zoombini {
// When we create a new Zoombini we run this function; it's called the constructor and you can see it taking our image in from above
constructor(targetImage) {
// We don't want the Zoombini to forget about it's image, so let's save that info
this.image = targetImage;
// The Zoombini isActive after it has opened up
this.isActive = false;
// But as it hasn't been used yet it's maskSize will be 0
this.maskSize = 0;
// And we have to start it's coordinates somewhere, they may as well be (0,0)
this.mousex = this.mousey = 0;
// Now we're set up let's build the necessary compoonents
// First let's clone our original image, I'm going to call it imageZoom and save it our Zoombini
this.imageZoom = this.image.cloneNode();
// And pop it next to the image target
this.image.parentNode.insertBefore(this.imageZoom, this.image);
// Make the zoom image that we'll crop float above it's original sibling
this.imageZoom.style.zIndex = 1;
// We don't want to be able to touch it though, we want to reach whats underneat
this.imageZoom.style.pointerEvents = "none";
// And so we can translate it let's make it absolute
this.imageZoom.style.position = "absolute";
// Now let's scale up our enlarged image and add an event listener so that it resizes whenever the size of the window changes
this.resizeImageZoom();
window.addEventListener("resize", this.resizeImageZoom.bind(this), false);
// Now that we're finishing the constructor we need to addeventlisteners so we can interact with it
// This function is just below, but still exists within our Zoombini
this.UI();
// Finally we'll apply an initial mask at default settings to hide this image
this.drawMask();
}
// resizeImageZoom resizes the enlarged image
resizeImageZoom() {
// So let's scale up this version
this.imageZoom.style.width = this.image.getBoundingClientRect().width * settings.magnification + 'px';
this.imageZoom.style.height = "unset"
}
// This could be inside the constructor but it's nicer on it's own I think
UI() {
this.image.addEventListener('mousemove', (event) => {
// When we move our mouse the x and y coordinates from the event
// We subtract the left and top coordinates so that we get the (x,y) coordinates of the actualy image, where (0,0) would be the top left
this.mousex = event.clientX - this.image.getBoundingClientRect().left;
this.mousey = event.clientY - this.image.getBoundingClientRect().top;
// if we're not active then don't display anything
if (!this.isActive) return;
// The drawMask() function below displays our the portion of the image that we're interested in
this.drawMask();
});
// When they mousedown we open up our mask
this.image.addEventListener('mousedown', () => {
// But it can be opening or closing, so let's pass in that information
this.isExpanding = true;
// To do that we start the maskSizer function, which calls itself until it reaches full size
this.maskSizer();
// And hide our cursor (we know where it is)
this.image.classList.add('is-active');
});
// if the mouse is released, close the mask
this.image.addEventListener('mouseup', () => {
// if it's not expanding, it's closing
this.isExpanding = false;
// if the mask has already expanded we'll need to start another maskSizer to shrink it. We don't run the maskSizer unless the mask is changing
if (this.isActive) this.maskSizer();
});
// same as above, caused by us moving out of the zoom area
this.image.addEventListener('mouseout', () => {
this.isExpanding = false;
if (this.isActive) this.maskSizer();
});
}
// The drawmask function shows us the piece of the image that we are hovering over
drawMask() {
// Let's use getBoundingClientRect to get the location of our images
let image = this.image.getBoundingClientRect();
let imageZoom = this.imageZoom.getBoundingClientRect();
// We'll start by getting the (x,y) of our big image that matches the piece we're mousing over (which we stored from our event listener as this.mousex and this.mousey). This is a clunky bit of code to help the zooms work in a variety of situations.
let prop_x = this.mousex / image.width * imageZoom.width * (1 - 1 / settings.magnification) - image.x - window.scrollX;
let prop_y = this.mousey / image.height * imageZoom.height * (1 - 1 / settings.magnification) - image.y - window.scrollY;
// Shift the large image by that amount
this.imageZoom.style.left = -prop_x + "px";
this.imageZoom.style.top = -prop_y + "px";
// Now we need to create our mask
// First let's get the coordinates of the point we're hovering over
let x = this.mousex * settings.magnification;
let y = this.mousey * settings.magnification;
// And create and apply our clip
let clippy = "circle(" + this.maskSize + "px at " + x + "px " + y + "px)";
this.imageZoom.style.clipPath = clippy;
this.imageZoom.style.webkitClipPath = clippy;
}
// We'll use the maskSizer to either expand or shrink the size of our mask
maskSizer() {
// We're in maskSizer so we're changing the size of our mask. Let's make the mask radius larger if the Zoombini is expanding, or shrink it if it's closing. The numbers below might need to be adjusted. It closes faster than it opens
this.maskSize = this.isExpanding ? this.maskSize + 35 : this.maskSize - 40;
// It has the form of: condition ? value-if-true : value-if-false
// Think of the ? as "then" and : as "else"
// if we've reaached max size, don't make it any larger
if (this.maskSize >= settings.maskSize) {
this.maskSize = settings.maskSize;
// we'll no longer need to change the maskSize so we'll just set this.isActive to true and let our mousemove do the drawing
this.isActive = true;
} else if (this.maskSize < 0) {
// Our mask is closed
this.maskSize = 0;
this.isActive = false;
this.image.classList.remove('is-active');
} else {
// Or else we haven't reached a size that we want to keep yet. So let's loop it on the next available frame
// We bind(this) here because so that the function remains in context
requestAnimationFrame(this.maskSizer.bind(this));
}
// After we have the appropriate size, draw the mask
this.drawMask();
}
}
function zoom(e) {
var zoomer = e.currentTarget;
e.offsetX ? offsetX = e.offsetX : offsetX = e.touches[0].pageX
e.offsetY ? offsetY = e.offsetY : offsetX = e.touches[0].pageX
x = offsetX / zoomer.offsetWidth * 100
y = offsetY / zoomer.offsetHeight * 100
zoomer.style.backgroundPosition = x + '% ' + y + '%';
}
//My image generated after page load
.image-zoom-available {
height: unset;
border-radius: 30px;
z-index: 1;
pointer-events: none;
position: absolute;
width: 834.688px;
left: 526.646px;
top: 231.729px;
clip-path: circle(0px at 439.062px 987.812px);
}
<div class="col-12 col-xl-3 col-lg-5 justify-content-center ">
<div class="mb-3">
<img class="image-zoom-available" style="height:75%; border-radius: 30px" src='{{ asset(' /radio/ ') }}{{examen.idpatient.id}}_examen_{{examen.id}}_radio.png' id="image_radio" draggable="false" />
</div>
</div>
Try adding the following property in your hidden image css :
display: none
A non visible element still take space in the web page. Cf: What is the difference between visibility:hidden and display:none?
Remove or override the display: none property when you want to display the image.
I add
this.imageZoom.style.display = "none";
on the event : mouseup and
this.imageZoom.style.display = "block";
on mousedown event. And it's fix thanks !
I'm having problems with using the canvas/mousemove. I want to be able to draw on the entire page whenever the mouse moves with a mousemove draw/paint tool but also still click text links that appear in various other divs. The issue I have is that the canvas which is currently fixed, has a transparent background color and is set to 100% width and height blocks the div underneath with a lower z-index, meaning the links can't be clicked. Using pointer-events:none on the canvas isn't the solution as it disables the mousemove effect. If I make the canvas z-index lower than the div's with the links I want to click, the drawing will just appear outside of the div.
What do I need to add or change to make this work? I basically just want to have a functioning webpage with a mouseover effect that will draw over the page whenever it moves.
Below is the script I'm using. And here's an example http://jsfiddle.net/zAF4d/1/
$(function() {
var letsdraw = false;
var theCanvas = document.getElementById('paint');
var ctx = theCanvas.getContext('2d');
theCanvas.width = window.innerWidth;
theCanvas.height = window.innerHeight;
var canvasOffset = $('#paint').offset();
$('#paint').mousemove(function(e) {
if (letsdraw === true) {
ctx.lineTo(e.pageX - canvasOffset.left, e.pageY - canvasOffset.top);
ctx.stroke();
}
});
$('#paint').mousemove(function(e) {
$('.v').css('left', e.clientX + 'px');
$('.h').css('top', e.clientY + 'px');
letsdraw = true;
ctx.strokeStyle = 'blue';
ctx.lineWidth = 0.5;
ctx.lineCap = 'round';
ctx.beginPath();
ctx.moveTo(e.pageX - canvasOffset.left, e.pageY - canvasOffset.top);
});
$(window).mouseout(function(e) {
// bind to the window mouse up, that way if you mouse up and you're not over
// the canvas you'll still get the release of the drawing.
letsdraw = true;
});
});
You say:
The issue I have is that the canvas which is currently fixed, has a transparent background color and is set to 100% width and height blocks the div underneath with a lower z-index, meaning the links can't be clicked. Using pointer-events:none on the canvas isn't the solution as it disables the mousemove effect. If I make the canvas z-index lower than the div's with the links I want to click, the drawing will just appear outside of the div.
I think you need to either do everything on canvas or use DOM and some sort of CSS tricks/animations.
$(function() {
var letsdraw = false;
var theCanvas = document.getElementById('paint');
var ctx = theCanvas.getContext('2d');
.
.
.
//if your div's are not same every time, determine similar prop so u can pull it here on to a canvas...by'ID' || 'Class' ...etc.
var div = document.getElementByID('div01');
dix.x;
div.y;
div.h;
.
.
.
**etc. or if u cannot for any reason pull actual div, just pass on it parameters here....
then u can use them here...*
like making collision model for drawing line over the top of it...
if (mouse.x > div.x && mouse.x < div.x + div.width && mouse.y > div.y && mouse.y < div.height) {
letsdraw = false;
}
....**within draw function
**'onclick' event listener try **
$(div)onclick function();
if whole div was pulled here then it will open links...but even if u pulled just div's parameters u just pass click coordinates on to div if link coordinates match
$(div)onclick function(){
load.page(url: <link>your link</>
}
sorry if mistaken something, didn't run it all together
But give it a go hope it helps;
I use this code for dragging a DIV, which is a small information box.
Within, I have some simple HTML including a input text or similar. When enabling the drag (see code) all inputs are frozen.
var selected = null, // Object of the element to be moved
x_pos = 0, y_pos = 0, // Stores x & y coordinates of the mouse pointer
x_elem = 0, y_elem = 0; // Stores top, left values (edge) of the element
// Will be called when user starts dragging an element
function _drag_init(elem) {
// Store the object of the element which needs to be moved
selected = elem;
x_elem = x_pos - selected.offsetLeft;
y_elem = y_pos - selected.offsetTop;
}
// Will be called when user dragging an element
function _move_elem(e) {
x_pos = document.all ? window.event.clientX : e.pageX;
y_pos = document.all ? window.event.clientY : e.pageY;
if (selected !== null) {
selected.style.left = (x_pos - x_elem) + 'px';
selected.style.top = (y_pos - y_elem) + 'px';
}
}
// Destroy the object when we are done
function _destroy() {
selected = null;
}
document.onmousemove = _move_elem;
document.onmouseup = _destroy;
There is a bigger code here, so I will simplify:
div = document.getElementById("mydiv");
div.onmousedown = function () {
_drag_init(this);
return false;
};
Now when I display the DIV, the drag works smoothly (FF 53) but any input elements within are frozen :)
The content of my infobox (the DIV) is simple
<input id="input_text" type="text" name="product" list="productName"/>
<datalist id="productName">
<option value="Pen">Pen</option>
<option value="Pencil">Pencil</option>
<option value="Paper">Paper</option>
</datalist><br> <button id="myNiceButton" action="input_text">OK</button>
I already tried bunch of solutions from StackOverflow without success, including eg. this one
Prevent drag event to interfere with input elements in Firefox using HTML5 drag/drop
<div draggable="true" id="draggableDiv">
<textarea onfocus="onFocus();" onblur="onBlur();">Inside draggable (FIXED)</textarea>
</div>
But seems that those events are not triggered at all. Also tried draggable="false" but the same story, not working.
What will be the problem?
Actually the drag code is fine.
div.onmousedown = function () {
_drag_init(this);
return false; // <-- remove this
};
Or play with preventdefault() which one suits best.
event.preventDefault() vs. return false
return false here will prevent any mouse "down" so I guess it's impossible to click in input text with the mouse, acting like "disabled".
I'm trying to create a dragbar so users can stretch the height or width of an element on my page (not interested in using HTML resize).
It seems like I'm pretty close, but I can't figure out why
1) the moveable bar is jumping all over the page
2) the adjustable div is flickering as the size changes (or sometimes disappearing completely).
You can see the demo at http://jsfiddle.net/dYUz7/
Here's the source
var elem = $('.layout');
var resizeBar = $('.resize-bar',elem),
adjustableWrapper = $('.layout-container-wrapper',elem),
posDir = 'Left',
pos = 'X';
if($(elem).hasClass('layout-updown')){
posDir = 'Top';
pos = 'Y';
}
var startPos = resizeBar[0]['offset'+posDir], i = resizeBar[0]['offset'+posDir];
resizeBar.on('mousedown', function(event) {
// Prevent default dragging of selected content
event.preventDefault();
console.log(event);
$(document).on('mousemove', mousemove);
$(document).on('mouseup', mouseup);
});
function mousemove(event) {
i = event['page'+pos] - startPos;
if(pos==='X') return changeSizeWidth(i,event.offsetX);
return changeSizeHeight(i,event.offsetY);
}
function changeSizeWidth(i,width){
resizeBar.css({left : i +'px'});
adjustableWrapper.css({'width': width +'px'});
console.log(adjustableWrapper.css('width'));
}
function changeSizeHeight(i,height){
resizeBar.css({top : i +'px'});
adjustableWrapper.css({'height': height +'px'});
console.log(adjustableWrapper.css('height'));
}
function mouseup() {
$(document).unbind('mousemove', mousemove);
$(document).unbind('mouseup', mouseup);
}
Please don't respond with suggestions for using libraries, I have jQuery in the sample, but I'm using angular in the project, and am trying to not add a bunch of other libraries at this point.
I ended up getting this working by changing the move from the move-bar element to the element which needs to grow or shrink.
The css is a bit messed up, but here's an updated jsfiddle of the result
http://jsfiddle.net/dYUz7/2/
function changeSizeWidth(left){
adjustableWrapper.css({'width': left +'px'});
}
I have a Main div inside which i am trying to display another small div on the coordinates captured on mouse click. Problem is that when i click on the extreme left, right, top, bottom the small div is going outside the main div. I have tried overflow:hidden on main div but i don't want that. i want div to be positioned inside the main div no matter where i click.
Sample code:
$(document).ready(function() {
$("#main_div").bind('click', function(event){
var x = event.pageX-document.getElementById("main_div").scrollLeft;
var y = event.pageY-document.getElementById("main_div").scrollTop;
$("#container-5").css({"top":y,"left":x});
});
You can check if the coordinates of the click would put part of the small div outside of the main div, and if so change the coordinates so that the small div remains inside the main div. (See this jsFiddle.)
$(document).ready(function() {
$("#main_div").bind('click', function(event) {
var $mainDiv = $("#main_div");
var $container5 = $("#container-5");
var x = event.pageX - $mainDiv.position().left;
var y = event.pageY - $mainDiv.position().top;
if (x + $container5.width() > $mainDiv.width()) {
x = $mainDiv.width() - $container5.width();
}
if (y + $container5.height() > $mainDiv.height()) {
y = $mainDiv.height() - $container5.height();
}
$container5.css({
"top": y,
"left": x
});
});
});