Reputation: 13
Added a function to add magnifying glass (.img-magnifier-glass) on button click. Now I want to remove the glass by clicking "cancel" button. I'm confused on how to write this function to work with the "magnify" function.
I tried to create a function that adds a class, and that class would be "display: none" on ".img-magnifier-glass".
function magnify(imgID, zoom)
{
var img, glass, w, h, bw;
img = document.getElementById(imgID);
/*create magnifier glass:*/
glass = document.createElement("DIV");
glass.setAttribute("class", "img-magnifier-glass");
/*insert magnifier glass:*/
img.parentElement.insertBefore(glass, img);
/*set background properties for the magnifier glass:*/
glass.style.backgroundImage = "url('" + img.src + "')";
glass.style.backgroundRepeat = "no-repeat";
glass.style.backgroundSize = (img.width * zoom) + "px " + (img.height * zoom) + "px";
bw = 3;
w = glass.offsetWidth / 2;
h = glass.offsetHeight / 2;
/*execute a function when someone moves the magnifier glass over the image:*/
glass.addEventListener("mousemove", moveMagnifier);
img.addEventListener("mousemove", moveMagnifier);
/*and also for touch screens:*/
glass.addEventListener("touchmove", moveMagnifier);
img.addEventListener("touchmove", moveMagnifier);
function moveMagnifier(e)
{
var pos, x, y;
/*prevent any other actions that may occur when moving over the image:*/
e.preventDefault();
/*get the cursor's x and y positions:*/
pos = getCursorPos(e);
x = pos.x;
y = pos.y;
/*prevent the magnifier glass from being positioned outside the image:*/
if (x > img.width - (w / zoom)) { x = img.width - (w / zoom); }
if (x < w / zoom) { x = w / zoom; }
if (y > img.height - (h / zoom)) { y = img.height - (h / zoom); }
if (y < h / zoom) { y = h / zoom; }
/*set the position of the magnifier glass:*/
glass.style.left = (x - w) + "px";
glass.style.top = (y - h) + "px";
/*display what the magnifier glass "sees":*/
glass.style.backgroundPosition = "-" + ((x * zoom) - w + bw) + "px -" + ((y * zoom) - h + bw) + "px";
}
function getCursorPos(e)
{
var a, x = 0, y = 0;
e = e || window.event;
/*get the x and y positions of the image:*/
a = img.getBoundingClientRect();
/*calculate the cursor's x and y coordinates, relative to the image:*/
x = e.pageX - a.left;
y = e.pageY - a.top;
/*consider any page scrolling:*/
x = x - window.pageXOffset;
y = y - window.pageYOffset;
return { x: x, y: y};
}
}
function onClick()
{
magnify("img1", 1.5);
magnify("img2", 1.5);
magnify("img4", 1.5);
}
<div>
<div class="slideshow-container">
<button onclick = "onClick()" id="btn1" type="button" class="btn"> Zoom In</button>
<button onclick = "zoomOut()" id= "btn2" type= "button" class="btn" >Cancel</button>
<div class="img-magnifier-container mySlides">
<img id = "img1" src="img1.jpg" width="800" height="600">
</div>
<div class="img-magnifier-container mySlides">
<img id = "img2" src="img2.jpg" width="800" height="600" >
</div>
<div class="img-magnifier-container mySlides">
<img id = "img4" src="img4.jpg" width="800" height="600">
</div>
</div>
Upvotes: 0
Views: 1096
Reputation: 1
I ve already did that ! Thanks for the zoomOut function.
This is my external JScript
function magnify(imgID, zoom) {
var img, glass, w, h, bw;
img = document.getElementById(imgID);
/* Create magnifier glass: */
glass = document.createElement("DIV");
glass.setAttribute("class", "img-magnifier-glass");
/* Insert magnifier glass: */
//img.parentElement.hidden(glass, img);
img.parentElement.insertBefore(glass, img);
/* Set background properties for the magnifier glass: */
glass.style.backgroundImage = "url('" + img.src + "')";
glass.style.backgroundRepeat = "no-repeat";
glass.style.backgroundSize = (img.width * zoom) + "px " + (img.height * zoom) + "px";
bw = 3;
w = glass.offsetWidth / 2;
h = glass.offsetHeight / 2;
/* Execute a function when someone moves the magnifier glass over the image: */
glass.addEventListener("mousemove", moveMagnifier);
img.addEventListener("mousemove", moveMagnifier);
/*and also for touch screens:*/
glass.addEventListener("touchmove", moveMagnifier);
img.addEventListener("touchmove", moveMagnifier);
function moveMagnifier(e) {
var pos, x, y;
/* Prevent any other actions that may occur when moving over the image */
e.preventDefault();
/* Get the cursor's x and y positions: */
pos = getCursorPos(e);
x = pos.x;
y = pos.y;
/* Prevent the magnifier glass from being positioned outside the image: */
if (x > img.width - (w / zoom)) {x = img.width - (w / zoom);}
if (x < w / zoom) {x = w / zoom;}
if (y > img.height - (h / zoom)) {y = img.height - (h / zoom);}
if (y < h / zoom) {y = h / zoom;}
/* Set the position of the magnifier glass: */
glass.style.left = (x - w) + "px";
glass.style.top = (y - h) + "px";
/* Display what the magnifier glass "sees": */
glass.style.backgroundPosition = "-" + ((x * zoom) - w + bw) + "px -" + ((y * zoom) - h + bw) + "px";
}
function getCursorPos(e) {
var a, x = 0, y = 0;
e = e || window.event;
/* Get the x and y positions of the image: */
a = img.getBoundingClientRect();
/* Calculate the cursor's x and y coordinates, relative to the image: */
x = e.pageX - a.left;
y = e.pageY - a.top;
/* Consider any page scrolling: */
x = x - window.pageXOffset;
y = y - window.pageYOffset;
return {x : x, y : y};
}
}
function zoomOut() {
var zooms = document.querySelectorAll(".img-magnifier-glass");
for(var x=0;x<zooms.length;x++) {
zooms[x].parentNode.removeChild(zooms[x]);
}
}
I used the steps from W3Schools [https://www.w3schools.com/howto/howto_js_image_magnifier_glass.asp][1]
In my Html file i used a switch to display several images :
function showmob(mob)
{
document.getElementById("mymob").className = "img_show";
switch (mob) {
case "mob1":
document.getElementById("mymob").src="iphone12.jpg";
zoomOut();
magnify("mymob", 3);
break;
case "mob2":
document.getElementById("mymob").src="samsung.jpg";
zoomOut();
magnify("mymob", 3);
break;
case "mob3":
document.getElementById("mymob").src="p40.jpg";
zoomOut();
magnify("mymob", 3);
break;
case "mob4":
document.getElementById("mymob").src="xiaomiRedmi.jpg";
zoomOut();
magnify("mymob", 3);
break;
}
}
<tr>
<td>iphone 12 </td>
<td>128 GB </td>
<td>TrueDepth </td>
<td>LiDAR</td>
<td>IOS 14 </td>
<td>1.229,00 € </td>
<td><button class="iconbtn" onclick="showmob('mob1')"><i class="fa fa-eye" ></i></button></td>
</tr>
<tr>
<td>samsung galaxy s20 </td>
<td>128 GB </td>
<td>40MP</td>
<td>108MP(f1.8/PDAF) + 48MP(f3.5) + 12MP(f2.2) </td>
<td>ANDROID 11 </td>
<td>1.399,00 € </td>
<td><button class="iconbtn" onclick="showmob('mob2')"><i class="fa fa-eye" ></i></button></td>
</tr>
<tr>
<td>huawei P40 </td>
<td>256 GB </td>
<td>32 MP </td>
<td>50 + 40 + 12 + 3D Tof M </td>
<td>ANDROID 11 </td>
<td>899,00 </td>
<td><button class="iconbtn" onclick="showmob('mob3')"><i class="fa fa-eye" ></i></button></td>
</tr>
Thanks again. I tried to distribute my solution
Upvotes: 0
Reputation: 114437
You need to find the added elements and delete them. Since the zoom script gives them all the class name of img-magnifier-glass
you can do the following:
function zoomOut() {
var zooms = document.querySelectorAll(".img-magnifier-glass");
for(var x=0;x<zooms.length;x++) {
zooms[x].parentNode.removeChild(zooms[x]);
}
}
Upvotes: 3