Question

我尝试在本地存储并在Cordova中显示我使用Ajax调用检索的图像。在这里我的来源：

<!DOCTYPE html>
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    or more contributor license agreements.  See the NOTICE file
    distributed with this work for additional information
    regarding copyright ownership.  The ASF licenses this file
    to you under the Apache License, Version 2.0 (the
    "License"); you may not use this file except in compliance
    with the License.  You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

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    software distributed under the License is distributed on an
    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
     KIND, either express or implied.  See the License for the
    specific language governing permissions and limitations
    under the License.
-->
<html>
    <head>
        <meta charset="utf-8" />
        <meta name="format-detection" content="telephone=no" />
        <meta name="viewport" content="user-scalable=no, initial-scale=1, maximum-scale=1, minimum-scale=1, width=device-width, height=device-height, target-densitydpi=device-dpi" />
        <link rel="stylesheet" type="text/css" href="css/index.css" />

        <title>Test requestFileSystem</title>
    </head>
    <body>
        <div class="app">
            <h1>Apache Cordova</h1>
            <div id="deviceready" class="blink">
                <p class="event listening">Connecting to Device</p>
                <p class="event received">Device is Ready</p>
            </div>
        </div>
        <script type="text/javascript" src="cordova.js"></script>
        <script type="text/javascript" src="js/index.js"></script>
        <script type="text/javascript">
            app.initialize();
        </script>

    </body>
</html>
<script>
    window.requestFileSystem  = window.requestFileSystem || window.webkitRequestFileSystem;

    function onError(e) {
        console.log('Error', e);
    }

    var xhr = new XMLHttpRequest();
    xhr.open('GET', 'http://upload.wikimedia.org/wikipedia/fr/2/26/10_francs_Mathieu_1987_F365-28_revers.jpg', true);
    xhr.responseType = 'blob';

    window.onload = function() {
        document.addEventListener("deviceready", start, false);
    }

    function start() {
        alert("dans start : deviceready fired");
        xhr.send();
    }

    xhr.onload = function(e) {
        alert("xhr.onload");
        doProcess();
    }

    function doProcess() {
        alert('dans doProcess');
        window.requestFileSystem(PERSISTENT, 1024 * 1024, function(fs) { // here
            alert('dans requestFileSystem 1 success');
            fs.root.getFile('image.jpg', {create: true}, function(fileEntry) {
                alert('dans getFile 1 success');
                fileEntry.createWriter(function(writer) {
                    alert('dans createWriter');
                    writer.onwrite = function(e) {};
                    writer.onerror = function(e) {};

                    var blob = new Blob([xhr.response], {type: 'image/jpeg'});

                    writer.write(blob);

                }, function(e) {
                    console.log('Error', e);
                });
            }, function(e) {
                console.log('Error', e);
            });
        }, function(e) {
            alert('error');
            console.log('Error', e);
        });

        window.requestFileSystem(PERSISTENT, 1024 * 1024, function(fs) {
            alert('dans reqestFileSystem 2 success');
            fs.root.getFile('image.jpg', {create: false}, function(fileEntry) {
                fileEntry.file(function(file) {
                    alert('dans file');
                    var reader = new FileReader();
                    reader.onloadend = function(event) {
                        var img = document.createElement("img");
                        img.src = event.target.result;

                        document.body.parentNode.insertBefore(img, document.body.nextSibling);
                    };
                    reader.readAsDataURL(file);
                }, function(e) {
                    console.log('Error', e);
                });
            }, function(e) {
                console.log('Error', e);
            });
        }, function(e) {
            console.log('Error', e);
        });

    };

    //xhr.send();</script>

问题是，似乎永远不会调用第一个window.requestFileSystem调用（注释“here”）的成功函数。也没有调用错误函数。显示我的“dans doProcess”警报，然后不再发生任何事情。我正在使用XCode和iOS模拟器进行测试。有什么想法吗？

window.requestFileSystem在Cordova中不起作用

0 个答案: