本文主要和大家介紹了cropper js基於vue的圖片裁剪上傳功能的相關資料,希望能幫助到大家。
首先下載引入cropper js，
npm install cropper js --save
在需要的頁面中引入：import Cropper from "cropper js"
#html的程式碼如下：
<template> <p id="demo"> <!-- 遮罩层 --> <p class="container" v-show="panel"> <p> <img id="image" :src="url" alt="Picture"> </p> <button type="button" id="button" @click="commit">确定</button> <button type="button"id="cancel" @click="cancel">取消</button> </p> <p style="padding:20px;"> <p class="show"> <p class="picture" :style="'backgroundImage:url('+headerImage+')'"> </p> </p> <p style="margin-top:20px;text-align: left;"> <input type="file" id="change" accept="image" @change="change"> <label for="change"></label> </p> </p> </p> </template>
主要是js程式碼，如下
1，data裡面定好初始變量，綁定數據，imgCropperData是我定義的判斷圖片格式的。
data() {
return {
headerImage: "",
picValue: "",
cropper: "",
croppable: false,
panel: false,
url: "",
imgCropperData: {
accept: "image/gif, image/jpeg, image/png, image/jpg"
}
};
}2，在mounted裡面初始換裁切框
mounted() {
//初始化这个裁剪框
var self = this;
var image = document.getElementById("image");
this.cropper = new Cropper(image, {
aspectRatio: 1,
viewMode: 1,
background: false,
zoomable: false,
ready: function() {
self.croppable = true;
}
});
}3.methods的方法比較多，包括建立URL路徑，input框change事件，canvas畫圖，確定提交上傳。我還加了取消事件函數，判斷上傳檔案的類型和大小。
methods: {
//取消上传
cancel() {
this.panel = false;
var obj = document.getElementById('change') ;
obj.outerHTML=obj.outerHTML;
},
//创建url路径
getObjectURL(file) {
var url = null;
if (window.createObjectURL != undefined) {
// basic
url = window.createObjectURL(file);
} else if (window.URL != undefined) {
// mozilla(firefox)
url = window.URL.createObjectURL(file);
} else if (window.webkitURL != undefined) {
// webkit or chrome
url = window.webkitURL.createObjectURL(file);
}
return url;
},
//input框change事件，获取到上传的文件
change(e) {
let files = e.target.files || e.dataTransfer.files;
if (!files.length) return;
let type = files[0].type; //文件的类型，判断是否是图片
let size = files[0].size; //文件的大小，判断图片的大小
if (this.imgCropperData.accept.indexOf(type) == -1) {
alert("请选择我们支持的图片格式！");
return false;
}
if (size > 5242880) {
alert("请选择5M以内的图片！");
return false;
}
this.picValue = files[0];
this.url = this.getObjectURL(this.picValue);
//每次替换图片要重新得到新的url
if (this.cropper) {
this.cropper.replace(this.url);
}
this.panel = true;
},
//确定提交
commit() {
this.panel = false;
var croppedCanvas;
var roundedCanvas;
if (!this.croppable) {
return;
}
// Crop
croppedCanvas = this.cropper.getCroppedCanvas();
// Round
roundedCanvas = this.getRoundedCanvas(croppedCanvas);
this.headerImage = roundedCanvas.toDataURL();
//上传图片
this.postImg();
},
//canvas画图
getRoundedCanvas(sourceCanvas) {
var canvas = document.createElement("canvas");
var context = canvas.getContext("2d");
var width = sourceCanvas.width;
var height = sourceCanvas.height;
canvas.width = width;
canvas.height = height;
context.imageSmoothingEnabled = true;
context.drawImage(sourceCanvas, 0, 0, width, height);
context.globalCompositeOperation = "destination-in";
context.beginPath();
context.arc(
width / 2,
height / 2,
Math.min(width, height) / 2,
0,
2 * Math.PI,
true
);
context.fill();
return canvas;
},
//提交上传函数
postImg() {
alert("上传成功");
//这边写图片的上传
}
}相關推薦：
PHP+jQuery+html5實作圖片選取裁切上傳(相容手機上傳)
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