我是 javascript 新手,正在修改 javascript 代码,该代码在图像上绘制动态文本,并且用户可以上传它。
图片将被修复,用户无法上传自己的图片。
无论我做什么,我都无法从此代码中删除“选择要上传的图像”选项。谁能帮我解决这个问题吗?
我的代码如下:
var text_title = "Heading";
var text_title1 = "Heading";
var imageLoader = document.getElementById('imageLoader');
imageLoader.addEventListener('change', handleImage, false);
var canvas = document.getElementById('imageCanvas');
var ctx = canvas.getContext('2d');
var img = new Image();
img.crossOrigin = "anonymous";
window.addEventListener('load', DrawPlaceholder)
function DrawPlaceholder() {
img.onload = function() {
DrawOverlay(img);
DrawText();
DynamicText(img)
};
img.src = 'uploads/<?php echo $image["image"] ?>';
}
function DrawOverlay(img) {
ctx.drawImage(img, 0, 0);
ctx.fillStyle = 'rgba(230, 14, 14, 0)';
ctx.fillRect(0, 0, canvas.width, canvas.height);
}
function DrawText() {
ctx.fillStyle = "black";
ctx.textBaseline = 'middle';
ctx.font = "50px 'Montserrat'";
ctx.fillText(text_title, 50, 50);
ctx.fillText(text_title1, 150, 250);
}
function DynamicText(img) {
document.getElementById('name').addEventListener('keyup', function() {
ctx.clearRect(0, 0, canvas.width, canvas.height);
DrawOverlay(img);
DrawText();
text_title = this.value;
ctx.fillText(text_title, 50, 50);
});
document.getElementById('name1').addEventListener('keyup', function() {
ctx.clearRect(0, 0, canvas.width, canvas.height);
DrawOverlay(img);
DrawText();
text_title1 = this.value;
ctx.fillText(text_title1, 150, 250);
});
}
function handleImage(e) {
var reader = new FileReader();
var img = "";
var src = "";
reader.onload = function(event) {
img = new Image();
img.onload = function() {
canvas.width = img.width;
canvas.height = img.height;
ctx.drawImage(img, 0, 0);
}
img.src = event.target.result;
src = event.target.result;
canvas.classList.add("show");
DrawOverlay(img);
DrawText();
DynamicText(img);
}
reader.readAsDataURL(e.target.files[0]);
}
function convertToImage() {
window.open(canvas.toDataURL('png'));
}
document.getElementById('download').onclick = function download() {
convertToImage();
}
<input class="controls__input" type="file" id="imageLoader" name="imageLoader" />
<label class="controls__label" for="name">First, choose an image.</label>
最佳答案
像这样吗?
var text_title = "Heading";
var canvas = document.getElementById('imageCanvas');
var ctx = canvas.getContext('2d');
var img = new Image();
// img.crossOrigin = "anonymous";
window.addEventListener('load', DrawPlaceholder)
function DrawPlaceholder() {
img.onload = function() {
DrawOverlay(img);
DrawText(text_title);
DynamicText(img)
};
img.src = 'https://via.placeholder.com/500x500';
}
function DrawOverlay(img) {
ctx.drawImage(img, 0, 0);
ctx.fillStyle = 'rgba(230, 14, 14, 0)';
ctx.fillRect(0, 0, canvas.width, canvas.height);
}
function DrawText(text) {
ctx.fillStyle = "black";
ctx.textBaseline = 'middle';
ctx.font = "50px 'Montserrat'";
ctx.fillText(text, 50, 50);
}
function DynamicText(img) {
document.getElementById('name').addEventListener('keyup', function() {
ctx.clearRect(0, 0, canvas.width, canvas.height);
DrawOverlay(img);
text_title = this.value;
DrawText(text_title);
});
}
canvas {
height: 300px;
width: 500px;
}
<input type="text" id="name" value="John" /><br/>
<canvas id="imageCanvas"></canvas>
关于javascript - 删除 JavaScript 中的文件上传选项不起作用,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/59612979/