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Add ajax_upload example

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PUBLISHED_FROM=c5691d4321fff2e03f689b0195abd1ec6a188418
This commit is contained in:
Alexander Alashkin 2017-03-20 10:41:42 +00:00 committed by Cesanta Bot
parent 380e87ddfa
commit 066be0fe30
3 changed files with 135 additions and 0 deletions
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3
examples/ajax_upload/Makefile Normal file
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PROG = ajax_upload
MODULE_CFLAGS = -DMG_ENABLE_HTTP_STREAMING_MULTIPART
include ../examples.mk

85
examples/ajax_upload/ajax_upload.c Normal file
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// Copyright (c) 2017 Cesanta Software Limited
// All rights reserved
#include "mongoose.h"
static const char *s_http_port = "8000";
static struct mg_serve_http_opts s_http_server_opts;
static void ev_handler(struct mg_connection *nc, int ev, void *p) {
if (ev == MG_EV_HTTP_REQUEST) {
mg_serve_http(nc, (struct http_message *) p, s_http_server_opts);
}
}
static void upload_handler(struct mg_connection *nc, int ev, void *p) {
(void) nc;
struct http_message *hm = (struct http_message *) p;
if (ev == MG_EV_HTTP_REQUEST) {
char file_name[256];
FILE *f = NULL;
if (mg_get_http_var(&hm->query_string, "file_name", file_name,
sizeof(file_name)) <= 0) {
mg_printf(nc, "%s",
"HTTP/1.1 500 File name is not specified\r\n"
"Content-Length: 0\r\n\r\n");
nc->flags |= MG_F_SEND_AND_CLOSE;
goto cleanup;
}
printf("Saving file %s, size %d bytes\n", file_name, (int) hm->body.len);
f = fopen(file_name, "w");
if (f == NULL) {
mg_printf(nc, "%s",
"HTTP/1.1 500 Failed to open a file\r\n"
"Content-Length: 0\r\n\r\n");
nc->flags |= MG_F_SEND_AND_CLOSE;
goto cleanup;
}
if (fwrite(hm->body.p, 1, hm->body.len, f) != hm->body.len) {
mg_printf(nc, "%s",
"HTTP/1.1 500 Failed to write to a file\r\n"
"Content-Length: 0\r\n\r\n");
nc->flags |= MG_F_SEND_AND_CLOSE;
goto cleanup;
}
mg_printf(nc, "%s",
"HTTP/1.1 200 OK\r\n"
"Content-Type: text/html\r\n"
"Connection: close\r\n"
"\r\n"
"File upload successfully");
nc->flags |= MG_F_SEND_AND_CLOSE;
printf("Done.\n");
cleanup:
if (f != NULL) {
fclose(f);
}
}
}
int main(void) {
struct mg_mgr mgr;
struct mg_connection *nc;
mg_mgr_init(&mgr, NULL);
printf("Starting web server on port %s\n", s_http_port);
nc = mg_bind(&mgr, s_http_port, ev_handler);
if (nc == NULL) {
printf("Failed to create listener\n");
return 1;
}
mg_register_http_endpoint(nc, "/upload", upload_handler MG_UD_ARG(NULL));
// Set up HTTP server parameters
mg_set_protocol_http_websocket(nc);
s_http_server_opts.document_root = "."; // Serve current directory
s_http_server_opts.enable_directory_listing = "yes";
for (;;) {
mg_mgr_poll(&mgr, 1000);
}
mg_mgr_free(&mgr);
return 0;
}

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examples/ajax_upload/index.html Normal file
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<!DOCTYPE html>
<html>
<head>
<title>AJAX Upload Example</title>
<script src="//code.jquery.com/jquery-1.9.1.js"></script>
<script type="text/javascript">
function updateProgress(evt) {
if (evt.lengthComputable) {
document.getElementById("output").textContent =
"Uploaded " + evt.loaded + " of " + evt.total + " bytes";
}
}
function uploadFile() {
var file_name = $('input[type=file]').val().split('\\').pop();
console.log("uploadFile: ", file_name)
var file_data = document.getElementById('file').files[0];
$.ajax({
url: "/upload?file_name=" + file_name,
type: "POST",
data: file_data,
processData: false,
contentType: false,
cache: false,
xhr: function() {
myXhr = $.ajaxSettings.xhr();
if(myXhr.upload){
myXhr.upload.addEventListener('progress',updateProgress, false); // for handling the progress of the upload
}
return myXhr;
},
}).done(function(data) {
document.getElementById("output").textContent = "Result: " + data;
});
return false;
}
</script>
</head>
<body>
<form method="post" id="filename" name="filename" onsubmit="return uploadFile();">
<label>Select a file:</label><br>
<input type="file" id="file" name="file" required />
<input type="submit" value="Upload" />
</form>
<br><br><div id="output"></div>
</body>
</html>