在工做中,使用AugularJs進行開發,在項目中,常常會遇到上傳圖片後,需在一旁預覽圖片內容,以前查了一些資料,結合實踐,得出一種比較實用的方法,相對簡化版,在這裏記錄一下,若有不一樣見解,歡迎一塊兒溝通,一塊兒成長。
demo.html:
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<!doctype html>
<html ng-app="myTestCtrl">
<head>
<meta charset="UTF-8">
<title>demo</title>
<script src="http://apps.bdimg.com/libs/angular.js/1.4.6/angular.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<script src="myCtrl.js"></script>
<style type="text/css">
.inputBox{width: 160px; height: 28px; padding: 0 0 0 8px; box-sizing: border-box; background-color:#fff; margin-left: 5px; border: 1px solid #c4c4c4; color: #333; border-radius: 3px; -o-border-radius: 3px;-moz-border-radius: 3px;-webkit-border-radius: 3px;}
.inputBox:focus{border: 1px solid #207fe9;}
.btn-primary {color: #fff; background-color: #428bca; border-color: #357ebd;}
.btn {display: inline-block; padding: 6px 12px; margin-bottom: 0; font-size: 14px; font-weight: 400;line-height: 1.42857143; text-align: center; white-space: nowrap; vertical-align: middle; -ms-touch-action: manipulation; touch-action: manipulation; cursor: pointer; -webkit-user-select: none; -moz-user-select: none; -ms-user-select: none; user-select: none; background-image: none; border: 1px solid transparent; border-radius: 4px;}
.bg-bbbbbb{background-color: #bbb;}
.fl{float:left;}
.ml5{margin-left: 5px;}
.ml10{margin-left: 10px;}
.ml30{margin-left: 30px;}
.mt10{margin-top: 10px;}
.mt20{margin-top: 20px;}
.f-cb:after:after{display:block;clear:both;visibility:hidden;height:0;overflow:hidden;content:".";}
.f-cb{zoom:1;}
.f-cb .topSearch{ float: left; margin-top: 10px; line-height: 30px; font-size: 12px; }
</style>
</head>
<body id="myTestCtrl" ng-controller="myTestCtrl">
<div class="wrapper">
<div class="content">
<div class="f-cb" style="height: 40px;">
<div class="topSearch"><span class="w70 tr dib fl">主視覺圖:</span><input type="text" class="inputBox fl ml5" ng-model="fileName"><button class="btn btn-primary ml10" ng-class="{'bg-bbbbbb':imgDisabled}" style="width:60px; margin-top:-3px; height:18px; position: relative;" img-upload></button></div>
</div>
<div class="f-cb mt10"><img ng-src="{{thumb.imgSrc}}" style="width:200px; height: 200px;" ng-show="thumb.imgSrc"/></div>
</div>
<div class="mt20 ml30">
<button class="btn btn-primary" ng-click="saveClick()" ng-class="{'bg-bbbbbb':submitDisabled}">提交</button>
</div>
</div>
</body>
</html>
[html] view plain copy
<span style="font-size:14px;">myCtrl.js:</span>
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<pre name="code" class="javascript">//關鍵 js 部分
var myTestCtrl = angular.module('myTestCtrl', []);
//定義「上傳」指令,修改後也可用於上傳其餘類型的文件
myTestCtrl.directive("imgUpload",function(){
return{
//經過設置項來定義
restrict: 'AE',
scope: false,
template: '<div class="fl"><input type="button" id="storeBtn" style="padding:0; position: absolute; top: 0; left: 0; background: none; border: none;color: #fff; width:84px; height: 30px; line-height: 30px;" value="選擇文件"><input type="file" name="testReport" id="file" ng-disabled="imgDisabled" style="position: absolute; top: 0; left: 0; opacity: 0;height: 30px;" accept=".jpg,.png"></div>', //name:testReport 與接口字段相對應。
replace: true,
link: function(scope, ele, attrs) {
ele.bind('click', function() {
$('#file').val('');
});
ele.bind('change', function() {
scope.file = ele[0].children[1].files;
if(scope.file[0].size > 52428800){
alert("圖片大小不大於50M");
scope.file = null;
return false;
}
scope.fileName = scope.file[0].name;
var postfix = scope.fileName.substring(scope.fileName.lastIndexOf(".")+1).toLowerCase();
if(postfix !="jpg" && postfix !="png"){
alert("圖片僅支持png、jpg類型的文件");
scope.fileName = "";
scope.file = null;
scope.$apply();
return false;
}
scope.$apply();
scope.reader = new FileReader(); //建立一個FileReader接口
console.log(scope.reader);
if (scope.file) {
//獲取圖片(預覽圖片)
scope.reader.readAsDataURL(scope.file[0]); //FileReader的方法,把圖片轉成base64
scope.reader.onload = function(ev) {
scope.$apply(function(){
scope.thumb = {
imgSrc : ev.target.result //接收base64,scope.thumb.imgSrc爲圖片。
};
});
};
}else{
alert('上傳圖片不能爲空!');
}
});
}
};
});
<ul class="silder_list" >
<li>
<a href="http://beijing.changtu.com/" target="_blank">北京客運站</a>
</li>
</ul>javascript