Onclick图片我们为用户提供了从计算机上载图片的选项，在用户上传图片之后，我们将显示“ 删除”文本。...一旦用户单击“删除”，我们正在删除上传的图片。...
要求：
在用户单击“删除文本”之前，他应该无法上传其他图像。...
它适用于单张图像。...
问题：
但是如果有多张图片，则用户在第一张图片上上传后，就不允许在第二张图片上上传图片。发生......
codepen：https://codepen.io/kidsdial/pen/PgmzOE
提琴：https://jsfiddle.net/kidsdial1/5xuLd8yt/
下面是代码段：
var target;
var imageUrl = "https://i.imgur.com/RzEm1WK.png";
// Json - it includes mask image
let jsonData = {
"layers" : [
{
"x" : 0,
"height" : 612,
"layers" : [
{
"x" : 0,
"y" : 0,
"name" : "L2a"
},
{
"x" : 160,
"layers" : [
{
"x" : 0,
"src" : "ax0HVTs.png",
"y" : 0,
"name" : "L2b-1"
},
{
"x" : 0,
"y" : 0,
"name" : "L2b-2"
}
],
"y" : 291,
"name" : "user_image_1"
},
{
"x" : 25,
"layers" : [
{
"x" : 0,
"src" : "hEM2kEP.png",
"y" : 0,
"name" : "L2C-1"
},
{
"x" : 0,
"y" : 0,
"name" : "L2C-2"
}
],
"y" :22,
"name" : "L2"
}
],
"y" : 0,
"width" : 612,
"name" : "L1"
}
]
};
$(document).ready(function() {
// upload image onclick mask image
$('.container').click(function(e) {
var res = e.target;
target = res.id;
console.log(target);
if (e.target.getContext) {
// click only inside Non Transparent part
// $('.container').css('pointer-events','none');
var pixel = e.target.getContext('2d').getImageData(e.offsetX, e.offsetY, 1, 1).data;
if (pixel[3] === 255) {
setTimeout(() => {
$('#fileup').click();
}, 20);
}
}
});
// Below code will fetch mask image from json file
function getAllSrc(layers) {
let arr = [];
layers.forEach(layer => {
if (layer.src) {
arr.push({
src: layer.src,
x: layer.x,
y: layer.y,
name: layer.name
});
} else if (layer.layers) {
let newArr = getAllSrc(layer.layers);
if (newArr.length > 0) {
newArr.forEach(({
src,
x,
y,
name
}) => {
arr.push({
src,
x: (layer.x + x),
y: (layer.y + y),
name: (name)
});
});
}
}
});
return arr;
}
function json(data)
{
var width = 0;
var height = 0;
let arr = getAllSrc(data.layers);
let layer1 = data.layers;
let counter = 0;
let table = [];
for (let {
src,
x,
y,
name
} of arr) {
var mask = $(".container").mask({
// icon :
imageUrl: imageUrl,
// Mask image :
maskImageUrl: 'https://i.imgur.com/' + src,
onMaskImageCreate: function(img) {
// image positions :
img.css({
"position": "absolute",
"left": x + "px",
"top": y + "px"
});
},
id: counter
});
table.push(mask);
fileup.onchange = function() {
//u day code
$('.container').css('pointer-events','none');
let mask2 = table[target];
const newImageLoadedId = mask2.loadImage(URL.createObjectURL(fileup.files[0]));
document.getElementById('fileup').value = "";
// Remove image
$("<br/><span id=\"" + newImageLoadedId + "\" class=\"remove\">Remove image</span>").insertAfter("#fileup");
$(".remove").click(function(event) {
$('.container').css('pointer-events','');
const canvasId = "canvas#" + event.currentTarget.id;
// Delete the image
const ctx = $("canvas")[event.currentTarget.id].getContext("2d");
ctx.fillStyle = "white"
ctx.fillRect(0, 0, 500, 500)
// Delete the button
$(this).remove();
});
// Remove image code end here....
};
counter++;
}
}
json(jsonData);
}); // end of document ready
// upload image & drag code
(function($) {
var JQmasks = [];
$.fn.mask = function(options) {
// This is the easiest way to have default options.
var settings = $.extend({
// These are the defaults.
maskImageUrl: undefined,
imageUrl: undefined,
scale: 1,
id: new Date().getUTCMilliseconds().toString(),
x: 0, // image start position
y: 0, // image start position
onMaskImageCreate: function(div) {},
}, options);
var container = $(this);
let prevX = 0,
prevY = 0,
draggable = false,
img,
canvas,
context,
image,
timeout,
initImage = false,
startX = settings.x,
startY = settings.y,
div;
container.mousePosition = function(event) {
return {
x: event.pageX || event.offsetX,
y: event.pageY || event.offsetY
};
}
container.selected = function(ev) {
var pos = container.mousePosition(ev);
var item = $(".masked-img canvas").filter(function() {
var offset = $(this).offset()
var x = pos.x - offset.left;
var y = pos.y - offset.top;
var d = this.getContext('2d').getImageData(x, y, 1, 1).data;
return d[0] > 0
});
JQmasks.forEach(function(el) {
var id = item.length > 0 ? $(item).attr("id") : "";
if (el.id == id)
el.item.enable();
else el.item.disable();
});
};
container.enable = function() {
draggable = true;
$(canvas).attr("active", "true");
div.css({
"z-index": 2
});
}
container.disable = function() {
draggable = false;
$(canvas).attr("active", "false");
div.css({
"z-index": 1
});
}
container.updateStyle = function() {
return new Promise((resolve, reject) => {
context.beginPath();
context.globalCompositeOperation = "source-over";
image = new Image();
image.setAttribute('crossOrigin', 'anonymous');
image.src = settings.maskImageUrl;
image.onload = function() {
canvas.width = image.width;
canvas.height = image.height;
context.drawImage(image, 0, 0, image.width, image.height);
div.css({
"width": image.width,
"height": image.height
});
resolve();
};
});
};
function renderInnerImage() {
img = new Image();
img.setAttribute('crossOrigin', 'anonymous');
img.src = settings.imageUrl;
img.onload = function() {
settings.x = settings.x == 0 && initImage ? (canvas.width - (img.width * settings.scale)) / 2 : settings.x;
settings.y = settings.y == 0 && initImage ? (canvas.height - (img.height * settings.scale)) / 2 : settings.y;
context.globalCompositeOperation = 'source-atop';
context.drawImage(img, settings.x, settings.y, img.width * settings.scale, img.height * settings.scale);
initImage = false;
};
}
// change the draggable image
container.loadImage = function(imageUrl) {
console.log("load");
//if (img)
// img.remove();
// reset the code.
settings.y = startY;
settings.x = startX;
prevX = prevY = 0;
settings.imageUrl = imageUrl;
initImage = true;
container.updateStyle().then(renderInnerImage);
return settings.id;
};
// change the masked Image
container.loadMaskImage = function(imageUrl, from) {
canvas = document.createElement("canvas");
context = canvas.getContext('2d');
canvas.setAttribute("draggable", "true");
canvas.setAttribute("id", settings.id);
settings.maskImageUrl = imageUrl;
div = $("<div/>", {
"class": "masked-img"
}).append(canvas);
// div.find("canvas").on('touchstart mousedown', function(event)
div.find("canvas").on('dragstart', function(event) {
if (event.handled === false) return;
event.handled = true;
container.onDragStart(event);
});
div.find("canvas").on('touchend mouseup', function(event) {
if (event.handled === false) return;
event.handled = true;
container.selected(event);
});
div.find("canvas").bind("dragover", container.onDragOver);
container.append(div);
if (settings.onMaskImageCreate)
settings.onMaskImageCreate(div);
container.loadImage(settings.imageUrl);
};
container.loadMaskImage(settings.maskImageUrl);
JQmasks.push({
item: container,
id: settings.id
})
return container;
};
}(jQuery));.container
{
background: gold;
position: relative;
width:612px;
height:612px;
}
.container img {
position:absolute;
top:0;
bottom:250px;
left:0;
right:0;
margin:auto;
z-index:999;
}
.masked-img {
overflow: hidden;
position: relative;
}
.pip {
display: inline-block;
margin: 10px 10px 0 0;
}
.remove {
display: block;
background: #444;
border: 1px solid black;
color: white;
text-align: center;
cursor: pointer;
}
.remove:hover {
background: white;
color: black;
}<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<input id="fileup" name="fileup" type="file" style="display:none" >
<div class="container">
</div>
在点击删除文本之前，我使用了以下代码限制上传图片：
$('.container').css('pointer-events','none');
$('.container').css('pointer-events','');
在添加以上两行之前，它在这里工作正常：codepen2
答案 0 :(得分：1)
由于您的标记中两个图像持有者都有一个共同的div，因此以下语句将选择整个div并禁用事件。
$('.container').css('pointer-events','none');
这是造成您的问题的原因，因为它不在第二个Codepen中。要更正它，您可以通过存储单击的图像保持器的位置/名称，然后将其与下一个事件进行比较，以检查单击了哪个图像保持器，并相应地采取行动（如果是另一个图像保持器），从而区分这两个图像保持器。
我能够对您的js代码进行一些更改。现在，选定的蒙版画布被ID禁用，并且仅在加载图像时才禁用。我还修改了删除按钮功能，以删除删除后的禁用功能
var target;
var imageUrl = "https://i.imgur.com/RzEm1WK.png";
// Json - it includes mask image
let jsonData = {
"layers" : [
{
"x" : 0,
"height" : 612,
"layers" : [
{
"x" : 0,
"y" : 0,
"name" : "L2a"
},
{
"x" : 160,
"layers" : [
{
"x" : 0,
"src" : "ax0HVTs.png",
"y" : 0,
"name" : "L2b-1"
},
{
"x" : 0,
"y" : 0,
"name" : "L2b-2"
}
],
"y" : 291,
"name" : "user_image_1"
},
{
"x" : 25,
"layers" : [
{
"x" : 0,
"src" : "hEM2kEP.png",
"y" : 0,
"name" : "L2C-1"
},
{
"x" : 0,
"y" : 0,
"name" : "L2C-2"
}
],
"y" :22,
"name" : "L2"
}
],
"y" : 0,
"width" : 612,
"name" : "L1"
}
]
};
$(document).ready(function() {
// upload image onclick mask image
$('.container').click(function(e) {
var res = e.target;
target = res.id;
console.log(target);
if (e.target.getContext) {
// click only inside Non Transparent part
var pixel = e.target.getContext('2d').getImageData(e.offsetX, e.offsetY, 1, 1).data;
if (pixel[3] === 255) {
setTimeout(() => {
$('#fileup').click();
}, 20);
}
}
});
// Below code will fetch mask image from json file
function getAllSrc(layers) {
let arr = [];
layers.forEach(layer => {
if (layer.src) {
arr.push({
src: layer.src,
x: layer.x,
y: layer.y,
name: layer.name
});
} else if (layer.layers) {
let newArr = getAllSrc(layer.layers);
if (newArr.length > 0) {
newArr.forEach(({
src,
x,
y,
name
}) => {
arr.push({
src,
x: (layer.x + x),
y: (layer.y + y),
name: (name)
});
});
}
}
});
return arr;
}
function json(data)
{
var width = 0;
var height = 0;
let arr = getAllSrc(data.layers);
let layer1 = data.layers;
width = layer1[0].width;
height = layer1[0].height;
let counter = 0;
let table = [];
for (let {
src,
x,
y,
name
} of arr) {
$(".container").css('width', width + "px").css('height', height + "px").addClass('temp');
if (name.indexOf('mask_') !== -1) {
var imageUrl1 = imageUrl;
} else {
var imageUrl1 = '';
}
var mask = $(".container").mask({
// icon :
imageUrl: imageUrl1,
// Mask image :
maskImageUrl: 'https://i.imgur.com/' + src,
onMaskImageCreate: function(img) {
// image positions :
img.css({
"position": "absolute",
"left": x + "px",
"top": y + "px"
});
},
id: counter
});
table.push(mask);
fileup.onchange = function() {
$("#"+String(target)).css("pointer-events", "none");
let mask2 = table[target];
const newImageLoadedId = mask2.loadImage(URL.createObjectURL(fileup.files[0]));
document.getElementById('fileup').value = "";
// Remove image
$("<br/><span id=\"" + newImageLoadedId + "\" class=\"remove\">Remove image</span>").insertAfter("#fileup");
$(".remove").click(function(event) {
const canvasId = "canvas#" + event.currentTarget.id;
// $(canvasId).css('pointer-events','auto')
// Delete the image
const ctx = $("canvas")[event.currentTarget.id].getContext("2d");
ctx.fillStyle = "white"
ctx.fillRect(0, 0, 500, 500)
// Delete the button
$(this).remove();
$(canvasId).css("pointer-events","");
});
// Remove image code end here....
};
counter++;
}
}
json(jsonData);
}); // end of document ready
// upload image & drag code
(function($) {
var JQmasks = [];
$.fn.mask = function(options) {
// This is the easiest way to have default options.
var settings = $.extend({
// These are the defaults.
maskImageUrl: undefined,
imageUrl: undefined,
scale: 1,
id: new Date().getUTCMilliseconds().toString(),
x: 0, // image start position
y: 0, // image start position
onMaskImageCreate: function(div) {},
}, options);
var container = $(this);
let prevX = 0,
prevY = 0,
draggable = false,
img,
canvas,
context,
image,
timeout,
initImage = false,
startX = settings.x,
startY = settings.y,
div;
container.mousePosition = function(event) {
return {
x: event.pageX || event.offsetX,
y: event.pageY || event.offsetY
};
}
container.selected = function(ev) {
var pos = container.mousePosition(ev);
var item = $(".masked-img canvas").filter(function() {
var offset = $(this).offset()
var x = pos.x - offset.left;
var y = pos.y - offset.top;
var d = this.getContext('2d').getImageData(x, y, 1, 1).data;
return d[0] > 0
});
JQmasks.forEach(function(el) {
var id = item.length > 0 ? $(item).attr("id") : "";
if (el.id == id)
el.item.enable();
else el.item.disable();
});
};
container.enable = function() {
draggable = true;
$(canvas).attr("active", "true");
div.css({
"z-index": 2
});
}
container.disable = function() {
draggable = false;
$(canvas).attr("active", "false");
div.css({
"z-index": 1
});
}
container.updateStyle = function() {
return new Promise((resolve, reject) => {
context.beginPath();
context.globalCompositeOperation = "source-over";
image = new Image();
image.setAttribute('crossOrigin', 'anonymous');
image.src = settings.maskImageUrl;
image.onload = function() {
canvas.width = image.width;
canvas.height = image.height;
context.drawImage(image, 0, 0, image.width, image.height);
div.css({
"width": image.width,
"height": image.height
});
resolve();
};
});
};
function renderInnerImage() {
img = new Image();
img.setAttribute('crossOrigin', 'anonymous');
img.src = settings.imageUrl;
img.onload = function() {
settings.x = settings.x == 0 && initImage ? (canvas.width - (img.width * settings.scale)) / 2 : settings.x;
settings.y = settings.y == 0 && initImage ? (canvas.height - (img.height * settings.scale)) / 2 : settings.y;
context.globalCompositeOperation = 'source-atop';
context.drawImage(img, settings.x, settings.y, img.width * settings.scale, img.height * settings.scale);
initImage = false;
};
}
// change the draggable image
container.loadImage = function(imageUrl) {
console.log("load");
//if (img)
// img.remove();
// reset the code.
settings.y = startY;
settings.x = startX;
prevX = prevY = 0;
settings.imageUrl = imageUrl;
initImage = true;
container.updateStyle().then(renderInnerImage);
return settings.id;
};
// change the masked Image
container.loadMaskImage = function(imageUrl, from) {
canvas = document.createElement("canvas");
context = canvas.getContext('2d');
canvas.setAttribute("draggable", "true");
canvas.setAttribute("id", settings.id);
settings.maskImageUrl = imageUrl;
div = $("<div/>", {
"class": "masked-img"
}).append(canvas);
// div.find("canvas").on('touchstart mousedown', function(event)
div.find("canvas").on('dragstart', function(event) {
if (event.handled === false) return;
event.handled = true;
container.onDragStart(event);
});
div.find("canvas").on('touchend mouseup', function(event) {
if (event.handled === false) return;
event.handled = true;
container.selected(event);
});
div.find("canvas").bind("dragover", container.onDragOver);
container.append(div);
if (settings.onMaskImageCreate)
settings.onMaskImageCreate(div);
container.loadImage(settings.imageUrl);
};
container.loadMaskImage(settings.maskImageUrl);
JQmasks.push({
item: container,
id: settings.id
})
return container;
};
}(jQuery));
由于Firestore无法正确加载，因此Codepen中的文件选择存在一些问题。右键单击黄色部分，尝试重新加载框架！