TypeError: cannot read property of undefined (ExpressJS/POST)

Question

我查看了所有类似的问题，none 对我有用。我有一个节点 js 应用程序，在其中我无法使用 body-parser 从表单打印输入文本。

我的index.ejs:

         <form id="demo-2" method = "POST" action="/search">
<input type="search" name = "searcher" placeholder="Search">
                    </form>

Index.js:

var cool = require('cool-ascii-faces');
var express = require('express');

var app = express();
var pg = require('pg');
var bodyParser = require('body-parser');
var env = require('node-env-file');

app.set('port', (process.env.PORT || 5000));
app.use(express.static(__dirname + '/views/'));

// views is directory for all template files
app.set('views', __dirname + '/views');
app.set('view engine', 'ejs');

//app.use(express.bodyParser());


//DIFFERENT APPS - tells them what to do

app.post('/search', function(request, response) {
    //var username = req.body;

    console.log("posted something"+ request.body.searcher);
    response.end("something was posted: "+ request.body.searcher);
});

app.get('/search', function(request, response) {
     response.send("skylarr");

});

尽管使用输入的名称搜索器，我还是收到错误消息：TypeError: Cannot read property 'searcher' of undefined

这里有什么问题？

Answer 1

标准 Node.JS HTTP 请求中没有 body 属性。该密钥由 bodyParser 中间件修补。

您可以添加 bodyParser 中间件，或者（如果您出于某种原因不想解析正文）使用查询或 URL 参数来传递 searcher。

Answer 2

您缺少正文解析器。你需要告诉 express 使用主体解析器作为中间件。

app.use(bodyParser.urlencoded({ extended: false }));
app.use(bodyParser.json());

在 app.post() 上方添加这两行。

Answer 3

body-parser 不是 express 的部分。使用 npm install body-parser --save 单独安装它，然后将其用作中间件。检查您评论 express.bodyParser() middleware

行后的代码

var cool = require('cool-ascii-faces');
var express = require('express');

var app = express();
var pg = require('pg');
var bodyParser = require('body-parser');
var env = require('node-env-file');

app.set('port', (process.env.PORT || 5000));
app.use(express.static(__dirname + '/views/'));

// views is directory for all template files
app.set('views', __dirname + '/views');
app.set('view engine', 'ejs');

//app.use(express.bodyParser());

app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));


//DIFFERENT APPS - tells them what to do

app.post('/search', function(request, response) {
    //var username = req.body;

    console.log("posted something"+ request.body.searcher);
    response.end("something was posted: "+ request.body.searcher);
});

app.get('/search', function(request, response) {
     response.send("skylarr");

});

TypeError: cannot read property of undefined (ExpressJS/POST)

TypeError: cannot read property of undefined (ExpressJS/POST)

javascript

post

node.js

express

body-parser