js 上傳圖片 大小控制
阿新 • • 發佈:2018-11-03
js 原生態 上傳圖片
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<div style="margin-left:10%;margin-top:20px">
<font size="3px;">
<a href="javascript:;" class="a-upload" ><input type="file" name="images1" id="xdaTanFileImg" onchange="xmTanUploadImg(this)" accept="image/*"/>
點選這裡上傳檔案
</a>
</font>
<img id="xmTanImg" style="height:35px;margin-top:-10px" >
</div>
<div style="margin-left:10%;margin-top:20px">
<font size="3px;">
<a href="javascript:;" class="a-upload"><input type="file" name="images2" id="xdaTanFileImg2" onchange="xmTanUploadImg2(this)" accept="image/*"/>
點選這裡上傳檔案
</a>
</font >
<img id="xmTanImg2" style="height:35px;margin-top:-10px">
</div>
</body>
</html>
<script type="text/javascript">
//判斷瀏覽器是否支援FileReader介面
if (typeof FileReader == 'undefined') {
//使選擇控制元件不可操作
document.getElementById("xdaTanFileImg").setAttribute("disabled", "disabled");
document.getElementById("xdaTanFileImg2").setAttribute("disabled", "disabled");
}
//選擇圖片,馬上預覽
function xmTanUploadImg(obj) {
var file = obj.files[0];
console.log(obj);console.log(file);
console.log("file.size = " + file.size); //file.size 單位為byte
var reader = new FileReader();
//讀取檔案過程方法
reader.onloadstart = function (e) {
console.log("開始讀取....");
}
reader.onprogress = function (e) {
console.log("正在讀取中....");
}
reader.onabort = function (e) {
console.log("中斷讀取....");
}
reader.onerror = function (e) {
console.log("讀取異常....");
}
reader.onload = function (e) {
console.log("成功讀取....");
var img = document.getElementById("xmTanImg");
img.src = e.target.result;
//或者 img.src = this.result; //e.target == this
}
reader.readAsDataURL(file)
}
//選擇圖片,馬上預覽
function xmTanUploadImg2(obj) {
var file = obj.files[0];
console.log(obj);console.log(file);
console.log("file.size = " + file.size); //file.size 單位為byte
var reader = new FileReader();
//讀取檔案過程方法
reader.onloadstart = function (e) {
console.log("開始讀取....");
}
reader.onprogress = function (e) {
console.log("正在讀取中....");
}
reader.onabort = function (e) {
console.log("中斷讀取....");
}
reader.onerror = function (e) {
console.log("讀取異常....");
}
reader.onload = function (e) {
console.log("成功讀取....");
var img = document.getElementById("xmTanImg2");
img.src = e.target.result;
//或者 img.src = this.result; //e.target == this
}
reader.readAsDataURL(file)
}
</script>