我正在尝试实现如下的预先输入功能。
HTML页面
...
...
<input id="product" name="product" type="text" class="form-control" placeholder="Enter Product Name" autocomplete="off">
...
...
<script>
$(document).ready(function () {
fetchTypeAheadResult();
});
function fetchTypeAheadResult() {
$('#product').typeahead({
source: function (request, response) {
var formData = {
'product' : $('#product').val()
}
// var formData = $('form').serialize();
$.ajax({
url: "/search",
dataType: "json",
type: "POST",
data: formData,
contentType: "application/json; charset=utf-8",
success: function (result) {
var items = [];
response($.map(result, function (item) {
items.push(item.name);
}))
response(items);
// SET THE WIDTH AND HEIGHT OF UI AS "auto" ALONG WITH FONT.
// YOU CAN CUSTOMIZE ITS PROPERTIES.
$(".dropdown-menu").css("width", "100%");
$(".dropdown-menu").css("height", "auto");
$(".dropdown-menu").css("font", "12px Verdana");
},
error: function (XMLHttpRequest, textStatus, errorThrown) {
alert(textStatus);
}
});
},
hint: true, // SHOW HINT (DEFAULT IS "true").
highlight: true, // HIGHLIGHT (SET <strong> or <b> BOLD). DEFAULT IS "true".
minLength: 1 // MINIMUM 1 CHARACTER TO START WITH.
});
}
</script>
...
...
我的后端节点js代码如下
'use strict';
const express = require('express');
const bodyParser = require('body-parser');
const request = require('request');
const app = express();
// configure the app to use bodyParser() to extract body from request.
app.use(bodyParser.urlencoded({ extended: true }));
// parse various different custom JSON types as JSON
app.use(bodyParser.json({ type: 'application/*+json' }));
app.post('/search', (req, res) => {
let searchText = req.body;
console.log('Search string >> ' + req);
console.log('Search string >> ' + JSON.stringify(req.body));
console.log('Search string >> ' + req.body.product);
// Not correct, but still trying if it works
// var result = triestrct.get(req.body.product);
res.send({test:'text'}); // TODO - to be updated with correct json
});
现在,每当我尝试在“产品”文本字段上键入时,它都会调用后端/搜索API。但是,我无法捕获产品领域的价值。
任何帮助将不胜感激 ?注意,我需要使用ajax调用的typeahead功能将输入文本值发送到后端。
三个控制日志的输出如下......
Search string >> [object Object]
Search string >> {}
Search string >> undefined
express
不解析自己提供给API的输入。因此,我们需要一些额外的工具,如body-parser
来获取请求的输入并将其格式化为JSON
。这可以在没有body-parser
的情况下完成。
要经历这个documentation,它涵盖了很多。
body-parser
,您需要使用body-parser
设置express
:```
const bodyParser = require('body-parser'),
// For Cross-Origin Resource Sharing
CORS = require('cors'),
express = require('express');
const app = express();
// Cross-Origin Resource Sharing
app.use(CORS());
// configure the app to use bodyParser() to extract body from request.
// parse urlencoded types to JSON
app.use(bodyParser.urlencoded({
extended: true
}));
// parse various different custom JSON types as JSON
app.use(bodyParser.json({ type: 'application/*+json' }));
// parse some custom thing into a Buffer
app.use(bodyParser.raw({ type: 'application/vnd.custom-type' }));
// parse an HTML body into a string
app.use(bodyParser.text({ type: 'text/html' }));
// This will get you input at `req.body`
app.post('/search',(req,res)=>{
console.log(JSON.stringify(req.body));
});
```
body-parser
:```
app.post('/', (req, res, next) => {
let body = [];
req.on('error', (err) => {
console.error(err);
}).on('data', (chunk) => {
// Without parsing data it's present in chunks.
body.push(chunk);
}).on('end', () => {
// Finally converting data into readable form
body = Buffer.concat(body).toString();
console.log(body);
// Setting input back into request, just same what body-parser do.
req.body = body;
next();
});
}, (req, res) => {
console.log(req.body);
});
```
req.body.product
不是req.query.product
在POST动词中使用qazxsw pi中间件
body-parser
我以前没有使用过类型,但这个const bodyParser = requier('body-parser');
const express = require('express');
const app = new express();
// parse application/x-www-form-urlencoded
app.use(bodyParser.urlencoded({ extended: false }))
// parse application/json
app.use(bodyParser.json())
app.post('/search',(req,res)=>{
console.log(JSON.stringify(req.body));
});
很清楚。