我正在尝试在mongodb中获取特定文档，并且正在使用find((。 问题是它没有给我我在 HTML 文件中寻找的结果(例如：我选择了我知道我的数据库中有的 MALE 和 XL(。 我得到的是：
Connected successfully to server
{ _id: 5df3c05bdfcdbd13d89d7c91,
'D_id': '',
name: null,
gender: null,
breed: null,
size: null,
age: null,
location: null }
DONE
*我有那种空文件，但这不是我要求的。
该 HTML 文件：
<html>
<head>
</script>
</head>
<body>
<link rel ="stylesheet" type='text/css' href='form.css'>
<div class="form">
<form method="POST" action="http://localhost:8080" style="text-align:center">
<label>Gender:</label><br>
<select>
<option name="g_gender" value="MALE">MALE</option>
<option name="g_gender" value="FEMALE">FEMALE</option>
</select> <br><br>
<label>size:</label><br>
<select>
<option name="g_size" value="XS"> XS</option>
<option name="g_size" value="S"> S</option>
<option name="g_size" value="M"> M</option>
<option name="g_size" value="L"> L</option>
<option name="g_size" value="XL"> XL<br><br>
</select> <br><br>
<br><button type="submit" class="button" value="Reset">RESET</button>
<button type="submit" class="button" value="Submit">SEARCH</button>
</form>
</div>
</body>
</html>
节点.js文件：
var express = require('express');
const bodyParser= require('body-parser');
const MongoClient = require('mongodb').MongoClient;
const mongo_url = 'mongodb://localhost:27017';
const http = require('http');
const assert = require('assert');
const qstring=require('querystring');
var app = express();
app.use(bodyParser.urlencoded({extended: true}))
app.get('/', (req, res) => {
res.sendFile(__dirname + '/form.html');
})
http.createServer(function (req, res) {
if (req.method == "POST"){
var reqData = '';
req.on('data', function (chunk) {
reqData += chunk;
});
req.on('end', function() {
var postParams = qstring.parse(reqData);
getDogsData(postParams.g_gender,postParams.g_size,res);
});
function getDogsData(g_gender,g_size,res){
MongoClient.connect(mongo_url,{ useUnifiedTopology: true },function(err,client) {
assert.equal(null, err);
console.log("Connected successfully to server");
var database = client.db('Dogs');
const coll = database.collection('adptdog');
const cursor = coll.find({gender:g_gender,size:g_size});
cursor.forEach(function(doc) {
res.write(JSON.stringify(doc));
console.log(doc);
},function(err) {
console.log("DONE");
client.close();
});
});
}
}}).listen(8080);
HTML code:
we have to add id and name into select tag then you can fetch value into the server-side.
<div class="form">
<form method="POST" action="http://localhost:8080" style="text-align:center">
<label>Gender:</label><br>
<select name="g_gender" id="g_gender">
<option name="g_gender" value="MALE">MALE</option>
<option name="g_gender" value="FEMALE">FEMALE</option>
</select> <br><br>
<label>size:</label><br>
<select name="g_size" id="g_size">
<option name="g_size" value="XS"> XS</option>
<option name="g_size" value="S"> S</option>
<option name="g_size" value="M"> M</option>
<option name="g_size" value="L"> L</option>
<option name="g_size" value="XL"> XL<br><br>
</select> <br><br>
<br><button type="submit" class="button" value="Reset">RESET</button>
<button type="submit" class="button" value="Submit">SEARCH</button>
</form>
</div>
you will request data into req.body.
node.js file:
var express = require('express');
const bodyParser= require('body-parser');
const MongoClient = require('mongodb').MongoClient;
const mongo_url = 'mongodb://localhost:27017';
const http = require('http');
const assert = require('assert');
const qstring=require('querystring');
var app = express();
app.use(bodyParser.urlencoded({extended: true}))
app.get('/', (req, res) => {
res.sendFile(__dirname + '/form.html');
})
http.createServer(function (req, res) {
if (req.method == "POST"){
let body=req.body;
getDogsData(body.g_gender,body.g_size,res);
function getDogsData(g_gender,g_size,res){
MongoClient.connect(mongo_url,{ useUnifiedTopology: true },function(err,client) {
assert.equal(null, err);
console.log("Connected successfully to server");
var database = client.db('Dogs');
const coll = database.collection('adptdog');
const cursor = coll.find({gender:g_gender,size:g_size});
cursor.forEach(function(doc) {
res.write(JSON.stringify(doc));
console.log(doc);
},function(err) {
console.log("DONE");
client.close();
});
});
}
}}).listen(8080);