上传或更新文件匹配表中行的objectId

Parse JavaScript Upload or update file match objectId of row in table

本文关键字：objectId 更新文件更新时间：2023-09-26

我也是Parse.com的新手。我已经通过Javascript完成了上传文件，但我想通过查找"objectId"来对类中的一行进行文件上传。但我找不到任何解决办法:(

下面是我的代码，我上传文件…

<html>
            <head>
            <script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>
            <script type="text/javascript" src="http://www.parsecdn.com/js/parse-1.2.15.min.js"></script>
            <script type="text/javascript">
            Parse.initialize("2Rsgjz6VQiozYpqQClfmBHQASTTtrdQpUoe2", "fIccKcC9sMH48CKkGYIk62wsA8tTgPpByip");

              $(function() {
                var file;
                // Set an event listener on the Choose File field.
                $('#fileselect').bind("change", function(e) {
                  var files = e.target.files || e.dataTransfer.files;
                  // Our file var now holds the selected file
                  file = files[0];
                });
                // This function is called when the user clicks on Upload to Parse. It will create the REST API request to upload this image to Parse.
                $('#uploadbutton').click(function() {
                  var serverUrl = 'https://api.parse.com/1/files/' + file.name;
                  $.ajax({
                    type: "POST",
                    beforeSend: function(request) {
                      request.setRequestHeader("X-Parse-Application-Id", '2Rsgjz6VQiozYpxWBfmBHQASTTtrdQpUoe2');
                      request.setRequestHeader("X-Parse-REST-API-Key", 'UPxPXDIkkC6lc52TYpQZ4bX5DjrWH9Wy7');
                      request.setRequestHeader("Content-Type", file.type);
                    },
                    url: serverUrl,
                    data: file,
                    processData: false,
                    contentType: false,
                    dataType: 'json',
                    success: function(data) {
                    var file_input = document.getElementById("url").innerHTML = '<a href="' + data.url + '">'+ data.url + '</a>';
                    var classUrl = "https://api.parse.com/1/classes/sampleClass"
                     if(data) {
            var fileName = "" + data.name;
            $.ajax({
                type: "POST",
                beforeSend: function(request) {
                    request.setRequestHeader("X-Parse-Application-Id", '2Rsgjz6VQiozYpqQClcxWBfmBHQASTTtrdQpUoe2');
                    request.setRequestHeader("X-Parse-REST-API-Key", 'UPxPXDIkkCLY2M2b56lc52TYpQZ4bX5DjrWH9Wy7');
                    request.setRequestHeader("Content-Type", 'application/json');
                },
                url: classUrl,
                data: '{"upload" : {"name" : '+"'""+fileName+"'""+', "__type" : "File"}}',
                processData: false,
                success: function(data) {
                    console.log("Image successfully uploaded.");
                },
                error: function(error) {
                    console.log("Error: " + error.message);
                }
            });
        } else {
            //Data is null
            console.log("Data IS NULL");
        }
                    },
                    error: function(data) {
                      var obj = jQuery.parseJSON(data);
                      alert(obj.error);
                    }
                  });
                });

              });
            </script>
            </head>
            <body>
            <div id="url">
            </div>
            <form id="fileupload" name="fileupload" enctype="multipart/form-data" method="post">
              <fieldset>
                <input type="file" name="fileselect" id="fileselect"></input>
                <input id="uploadbutton" type="button" value="Upload to Parse"/>
              </fieldset>
            </form>

            </body>
            </html>

我解决了。只需在第二个"ajax"POST"替换为"PUT"，并在url中设置要更新的对象的"objectId"，以更新现有文件。我的代码如下…

$(document).ready(function() {
//Init Parse SDK
Parse.initialize("yourappkey", "yourjskey");
//File Upload
var file;
// Set an event listener on the Choose File field.
$('#fileselect').bind("change", function(e) {
    var files = e.target.files || e.dataTransfer.files;
    // Our file var now holds the selected file
    file = files[0];
});
// This function is called when the user clicks on Upload to Parse. It will create the REST API request to upload this image to Parse.
$('#uploadbutton').click(function() {
    var serverUrl = 'https://api.parse.com/1/files/' + file.name;
    $.ajax({
        type: "POST",
        beforeSend: function(request) {
            request.setRequestHeader("X-Parse-Application-Id", 'yourappid');
            request.setRequestHeader("X-Parse-REST-API-Key", 'yourrestapikey');
            request.setRequestHeader("Content-Type", file.type);
        },
        url: serverUrl,
        data: file,
        processData: false,
        contentType: false,
        dataType: 'json',
        success: function(data) {
            //Change variable to reflect your class to upload to
            var classUrl = "https://api.parse.com/1/classes/ClassName/objectId"
            if(data) {
                var fileName = "" + data.name;
                $.ajax({
                    type: "PUT",
                    beforeSend: function(request) {
                      request.setRequestHeader("X-Parse-Application-Id", 'yourappid');
                    request.setRequestHeader("X-Parse-REST-API-Key", 'yourrestapikey');
                        request.setRequestHeader("Content-Type", 'application/json');
                    },
                    url: classUrl,
                    data: '{"upload" : {"name" : '+"'""+fileName+"'""+', "__type" : "File"}}',
                    processData: false,
                    success: function(data) {
                        console.log("Image successfully uploaded.");
                    },
                    error: function(error) {
                        console.log("Error: " + error.message);
                    }
                });
            } else {
                //Data is null
                console.log("Data IS NULL");
            }
        },
        error: function(data) {
            var obj = jQuery.parseJSON(data);
            alert(obj.error);
        }
    });
});
});