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docs: Replaced FileTransfer example with a XHR example

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Norman Breau 2020-06-07 12:47:30 -03:00
parent 044ef36cd4
commit 4387da910d
1 changed files with 36 additions and 18 deletions
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README.md
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@ -236,34 +236,52 @@ function onOnline() {
When the online event fires in the preceding code, call the app's `tryToUploadFile` function. When the online event fires in the preceding code, call the app's `tryToUploadFile` function.
If the FileTransfer object's upload function fails, call the app's `offlineWrite` function to save the current data somewhere. If the upload fails, then call the app's `offlineWrite` function to save the current data somewhere.
>*Note* This example requires the FileTransfer plugin. >*Note* For simplicity, file reading & writing was omitted. Refer to the [cordova-plugin-file](https://github.com/apache/cordova-plugin-file#cordova-plugin-file) documentation for more information on file handling.
```js ```js
function tryToUploadFile() { function tryToUploadFile() {
// !! Assumes variable fileURL contains a valid URL to a text file on the device, // !! Assumes variable fileURL contains a valid URL to a text file on the device,
var fileURL = getDataFileEntry().toURL(); var fileURL = getDataFileEntry().toURL();
getFileBlobSomehow(fileURL, function(fileBlob) {
var success = function (r) {
console.log("Response = " + r.response);
display("Uploaded. Response: " + r.response);
};
var success = function (r) { var fail = function (error) {
console.log("Response = " + r.response); console.log("An error has occurred: Code = " + error.code || error.status);
display("Uploaded. Response: " + r.response); offlineWrite("Failed to upload: some offline data");
} }
var fail = function (error) { var xhr = new XMLHttpRequest();
console.log("An error has occurred: Code = " + error.code);
offlineWrite("Failed to upload: some offline data");
}
var options = new FileUploadOptions(); xhr.onerror = fail;
options.fileKey = "file"; xhr.ontimeout = fail;
options.fileName = fileURL.substr(fileURL.lastIndexOf('/') + 1); xhr.onload = function() {
options.mimeType = "text/plain"; // If the response code was successful...
if (xhr.status >= 200 && xhr.status < 400) {
success(xhr);
}
else {
fail(xhr)
}
}
var ft = new FileTransfer(); // Make sure you add the domain of your server URL to the
// Make sure you add the domain of your server URL to the // Content-Security-Policy <meta> element in index.html.
// Content-Security-Policy <meta> element in index.html. xhr.open("POST", encodeURI(SERVER));
ft.upload(fileURL, encodeURI(SERVER), success, fail, options);
xhr.setRequestHeader("Content-Type", "text/plain");
// The server request handler could read this header to
// set the filename.
xhr.setRequestHeader("X-Filename", fileURL.substr(fileURL.lastIndexOf("/") + 1));
xhr.send(fileBlob);
});
}; };
``` ```