從JSON獲取圖像
[英]Fetch the Image from JSON
問題描述
我正在嘗試下面的代碼從json文件中獲取“ src”：“ ax0HVTs.png” 。...但是圖像未顯示，控制台中也沒有錯誤。
這是codepen的鏈接： https ://codepen.io/kidsdial/pen/WmZBmg
var mask; 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() { $('.container').click(function(e) { if (e.target.getContext) { var pixel = e.target.getContext('2d').getImageData(e.offsetX, e.offsetY, 1, 1).data; if (pixel[3] === 255) { setTimeout(() => { $('#fileup').click(); }, 20); } } }); function json(data) { function getFirstSrc(layers) { for (let i = 0; i < layers.length; i++) { let layer = layers[i]; if (layer.src) return { src: layer.src, x: layer.x }; if (layer.layers) { let first = getFirstSrc(layer.layers); if (first) return { src: first.src, x: layer.x + first.x }; } } var mask = $(".container").mask({ maskImageUrl: 'https://i.imgur.com/' + first.src, onMaskImageCreate: function(img) { img.css({ "position": "absolute", "left": layer.x + first.x + "px" }); } }); fileup.onchange = function() { mask.loadImage(URL.createObjectURL(fileup.files[0])); }; } } json(jsonData); }); // end of document ready // ignore below code (function($) { 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.updateStyle = function() { clearTimeout(timeout); timeout = setTimeout(function() { context.clearRect(0, 0, canvas.width, canvas.height); 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 }); }; img = new Image(); img.src = settings.imageUrl; img.setAttribute('crossOrigin', 'anonymous'); 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; }; }, 0); }; // change the draggable image container.loadImage = function(imageUrl) { if (img) img.remove(); // reset the code. settings.y = startY; settings.x = startX; prevX = prevY = 0; settings.imageUrl = imageUrl; initImage = true; container.updateStyle(); }; // change the masked Image container.loadMaskImage = function(imageUrl, from) { if (div) div.remove(); 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));
.temp { background: black; } .container { background: black; position: relative; height:612px; width:612px; } .masked-img { overflow: hidden; margin-top: 30px; position: relative; }
<script src="https://code.jquery.com/jquery-3.3.1.min.js"></script> <input id="fileup" name="fileup" type="file" style="display:none" > <div class="container"> </div>
我正在使用forloop來獲取json層....
如果您需要任何說明，請告訴我。
提前致謝....
2 個解決方案
解決方案1
0 2019-03-12 13:13:27
此示例示例將幫助您找出所需圖像的確切位置和src
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"
}]
}];
console.log(jsonData);
let value =[];
let v = jsonData.filter((key) => {
return key.layers[0].layers[1].layers.some( (val) => { if(val.src == "ax0HVTs.png"){ value.push(val.src) }
});
})
輸出：
value = ["ax0HVTs.png"]
您甚至可以使用find函數，如果存在給定的src，它將返回整個對象
解決方案2
0 已采納 2019-03-12 13:30:11
var mask;
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() {
$('.container').click(function(e) {
if (e.target.getContext) {
var pixel = e.target.getContext('2d').getImageData(e.offsetX, e.offsetY, 1, 1).data;
if (pixel[3] === 255) {
setTimeout(() => {
$('#fileup').click();
}, 20);
}
}
});
function json(data)
{
// function getFirstSrc(layers)
//{
let first;
for (let i = 0; i < data.length; i++)
{
let layer = data[i];
for (let j = 0; j< layer.layers.length; j++) {
let layerAbove = layer.layers[j];
console.log(layerAbove);
if (layerAbove.layers && layerAbove.layers.length > 0){
for (let k = 0; k< layerAbove.layers.length; k++) {
if (layerAbove.layers[k].src)
first = {
src: layerAbove.layers[k].src,
x: layerAbove.layers[k].x + layerAbove.x,
y: layerAbove.layers[k].y + layerAbove.y
};
//return;
}
/*if (first) {
return;
}*/
}
/*if (first) {
return;
}*/
}
console.log(first)
var mask = $(".container").mask({
maskImageUrl: 'https://i.imgur.com/' + first.src,
onMaskImageCreate: function(img) {
img.css({
"position": "absolute",
"left": first.x + "px",
"top": first.y + "px"
});
}
});
fileup.onchange = function() {
mask.loadImage(URL.createObjectURL(fileup.files[0]));
};
// }
}
}
json(jsonData.layers);
}); // end of document ready
// jq plugin for mask
(function($) {
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.onDragStart = function(evt) {
container.selected(evt);
prevX = evt.clientX;
prevY = evt.clientY;
var img = new Image();
evt.originalEvent.dataTransfer.setDragImage(img, 10, 10);
evt.originalEvent.dataTransfer.setData('text/plain', 'anything');
};
container.getImagePosition = function() {
return {
x: settings.x,
y: settings.y,
scale: settings.scale
};
};
container.onDragOver = function(evt) {
if (draggable && $(canvas).attr("active") === "true") {
var x = settings.x + evt.clientX - prevX;
var y = settings.y + evt.clientY - prevY;
if (x == settings.x && y == settings.y)
return; // position has not changed
settings.x += evt.clientX - prevX;
settings.y += evt.clientY - prevY;
prevX = evt.clientX;
prevY = evt.clientY;
container.updateStyle();
}
};
container.updateStyle = function() {
clearTimeout(timeout);
timeout = setTimeout(function() {
context.clearRect(0, 0, canvas.width, canvas.height);
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
});
};
img = new Image();
img.src = settings.imageUrl;
img.setAttribute('crossOrigin', 'anonymous');
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;
};
}, 0);
};
// change the draggable image
container.loadImage = function(imageUrl) {
if (img)
img.remove();
// reset the code.
settings.y = startY;
settings.x = startX;
prevX = prevY = 0;
settings.imageUrl = imageUrl;
initImage = true;
container.updateStyle();
};
// change the masked Image
container.loadMaskImage = function(imageUrl, from) {
if (div)
div.remove();
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));
從JSON網址獲取
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