500 TypeError:在将数据从html表单传输到Node服务器时，无法读取未定义的属性“名称”？
我正在尝试将数据从html页面发送到NodeJS服务器。
我的html代码是：
<body>
<nav>
<ul>
<li>
<a href="#" class="button add">Add Product</a>
<div class="dialog" style="display:none">
<div class="title">Add Product</div>
<form action="addevent" method="get">
<input id = "name" name="name" type="text" placeholder="Product Name"/>
<input name="code" type="text" placeholder="Product Code"/>
<input name="category" type="text" placeholder=" Category"/>
<input name="brand" type="text" placeholder="Brand"/>
<input type="submit" value="Ok"/>
</form>
</div>
</li>
<li class="radio">
<a href="#" class="button active"></a>
<a href="#" class="button"></a>
<a href="#" class="button"></a>
</li>
</ul>
</div>
</nav>
<p></p>
<script src='http://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js'></script>
<script src="js/index.js"></script>
</body>我的服务器代码是：
server.js
var express = require("express"),
app = express(),
bodyParser = require('body-parser'),
errorHandler = require('errorhandler'),
methodOverride = require('method-override'),
hostname = process.env.HOSTNAME || 'localhost',
port = parseInt(process.env.PORT, 10) || 4004,
publicDir = process.argv[2] || __dirname + '/public';
var exec = require('child_process').exec;
var fs = require('fs');
//Show homepage
app.get("/", function (req, res) {
res.redirect("/index.html");
});
app.get("/addevent", function (req, res){
res.send('You sent the name "' + req.body.name + '".');
});
//Search page
app.use(methodOverride());
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({
extended: true
}));
app.use(express.static(publicDir));
app.use(errorHandler({
dumpExceptions: true,
showStack: true
}));
console.log("Server showing %s listening at http://%s:%s", publicDir, hostname, port);
app.listen(port);但是，当我从html页面提交表单时，它会出现以下错误！
连接500 TypeError:无法读取未定义at (/home/shubham/Music/pricesync/server/node_modules/express/lib/router/route.js:131:13) at app.use.bodyParser.urlencoded.extended Layer.handle request at next (/home/shubham/Music/pricesync/server/node_modules/express/lib/router/route.js:131:13) at Route.dispatch (/home/shubham/Music/pricesync/server/node_modules/express/lib/router/route.js:112:3的属性“名称”/home/shubham/Music/pricesync/server/node_modules/express/lib/router/index.js:277:22 at Function.process_params (/home/shubham/Music/pricesync/server/node_modules/express/lib/router/index.js:330:12) at next (/home/shubham/Music/pricesync/server/node_modules/express/lib/router/index.js:271:10) at expressInit (/home/shubham )/Music/pricesync/server/node_modules/express/lib/middleware/init.js:33:5) at Layer.handle request
回答 3
Stack Overflow用户
发布于 2015-08-31 08:25:07
在GET请求中，没有req.body，这就是为什么出现未定义错误的原因。表单字段的值将作为查询字符串传递，因此需要从req对象读取查询字符串值。
Stack Overflow用户
发布于 2015-08-31 09:25:50
尝试将路由放在中间件下面，并使用“POST”http谓词。
var express = require("express"),
app = express(),
bodyParser = require('body-parser'),
errorHandler = require('errorhandler'),
methodOverride = require('method-override'),
hostname = process.env.HOSTNAME || 'localhost',
port = parseInt(process.env.PORT, 10) || 4004,
publicDir = process.argv[2] || __dirname + '/public';
var exec = require('child_process').exec;
var fs = require('fs');
//Search page
app.use(methodOverride());
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({
extended: true
}));
app.use(express.static(publicDir));
//Show homepage
app.get("/", function (req, res) {
res.redirect("/index.html");
});
app.post("/addevent", function (req, res){
res.send('You sent the name "' + req.body.name + '".');
});
app.use(errorHandler({
dumpExceptions: true,
showStack: true
}));
console.log("Server showing %s listening at http://%s:%s", publicDir, hostname, port);
app.listen(port);确保将表单方法更改为"post“。
Stack Overflow用户
发布于 2015-08-31 10:36:05
为了将数据从HTML表单发送到服务器，最佳实践是使用POST方法。表单提交的默认编码是：
Content-Type:application/x-www-form-urlencoded
在Express中，您使用了bodyParser中间件和json()方法，该方法不能工作，因为您发送的数据不是JSON编码的。
您的bodyParser需要像这样在您的路线之前：
app.use(bodyParser.urlEncoded());
app.post("/addevent", function (req, res){
....我建议你读初学者的书
https://stackoverflow.com/questions/32306646
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