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angular.js - angularjs的问题：点击”选择图片“后，需要很长的时间才能选择图片

问题描述

其他功能能正常使用。尝试了很多次，每次都要较长时间才能进行图片选择。为什么需要那么长的时间才能选择图片？

以下是我的代码：

<!DOCTYPE html>
<html ng-app="fileUpload">
<head>
    <meta name="renderer" content="webkit|ie-comp|ie-stand">
    <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"/>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <title>AngularJs</title>
    <script type="text/javascript" src="js/lib/angular/angular.js"></script>
    <script type="text/javascript" src="js/lib/angular/ng-file-upload.min.js"></script>
    <script type="text/javascript" src="js/lib/angular/ng-file-upload-shim.min.js"></script>
    <script type="text/javascript" src="js/lib/angular/ng-img-crop.js"></script>
</head>
<body ng-app="fileUpload" ng-controller="MyCtrl">
    <form name="myForm">
        <p>Crop Image and Upload</p>
        <button ngf-select ng-model="picFile" accept="image/*">Select Picture</button>
        <p ngf-drop ng-model="picFile" ngf-pattern="image/*" class="cropArea">
            <img-crop image="picFile  | ngfDataUrl" result-image="croppedDataUrl" ng-init="croppedDataUrl=''"></img-crop>
        </p>
        <p><img ng-src="{{croppedDataUrl}}" /></p>
        <button ng-click="upload(croppedDataUrl, picFile.name)">Submit</button>  
        <span class="progress" ng-show="progress >= 0">
          <p style="width:{{progress}}%" ng-bind="progress + '%'"></p>
        </span>
        <span ng-show="result">Upload Successful</span>
        <span class="err" ng-show="errorMsg">{{errorMsg}}</span>
    </form>
</body>
</html>
<script type="text/javascript">
    var app = angular.module('fileUpload', ['ngFileUpload', 'ngImgCrop']);
    app.controller('MyCtrl', ['$scope', 'Upload', '$timeout', function ($scope, Upload, $timeout) {
        $scope.upload = function (dataUrl, name) {
            Upload.upload({
                url: 'https://angular-file-upload-cors-srv.appspot.com/upload',
                data: {
                    file: Upload.dataUrltoBlob(dataUrl, name)
                },
            }).then(function (response) {
                $timeout(function () {
                    $scope.result = response.data;
                });
            }, function (response) {
                if (response.status > 0) $scope.errorMsg = response.status 
                    + ': ' + response.data;
            }, function (evt) {
                $scope.progress = parseInt(100.0 * evt.loaded / evt.total);
            });
        }
    }]);
</script>
<style type="text/css">
    .cropArea {background: #E4E4E4; overflow: hidden; width:500px; height:350px; }
    form .progress {line-height: 15px; }
    .progress {display: inline-block; width: 100px; border: 3px groove #CCC; }
    .progress p {font-size: smaller; background: orange; width: 0; }

    img-crop {width: 100%; height: 100%; display: block; position: relative; overflow: hidden; }
    img-crop canvas {display: block; position: absolute; top: 50%; left: 50%; outline: none; -webkit-tap-highlight-color: rgba(255, 255, 255, 0);}
</style>

【参考】
上面的代码来自：http://jsfiddle.net/danialfar...
ng-file-upload介绍：https://github.com/danialfari...

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全部回复(2)我来回复

  • 天蓬老师

    天蓬老师2017-05-15 17:12:25

    有可能是因为没有设置上传文件类型的原因，我之前也是有这样的问题改成
    accept: 'image/jpg,image/jpeg,image/png'就好了

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  • PHP中文网

    PHP中文网2017-05-15 17:12:25

    accept会在计算机中进行过滤，所有打开很慢。换成ngf-pattern过滤，如何不符合ngf-pattern="image/* 的话，返回值是null,不会是你上传的文件。

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