[英]How can I access session data in an EJS template with a node.js backend?
[英]How can I access my node data in ejs
我有一個從Nedb數據庫獲取數據的節點Web服務器。 我想將此數據傳遞給頁面上的某些ejs代碼,但節點死了,並告訴我所傳遞的JSON對象中沒有數據。 這是服務器代碼:
"use strict";
const DATA_HANDLER = require('./node/DataHandler');
class app {
constructor() {
this.ejsData = null;
this.loadServer();
}
loadServer() {
const HTTP = require('http'),
EJS = require('ejs'),
PORT = 1337,
SERVER = HTTP.createServer((req, res) => {
let httpHandler = (err, str, contentType) => {
if (err) {
res.writeHead(500, { 'Content-Type': 'text/plain' });
res.end('An error has occurred: ' + err.message);
} else if (contentType.indexOf('image') >= 0) {
res.writeHead(200, { 'Content-Type': contentType });
res.end(str, 'binary');
} else {
res.writeHead(200, { 'Content-Type': contentType });
res.end(EJS.render(str, {
data: this.ejsData,
filename: 'index.ejs'
}));
}
};
if (req.method == 'POST') {
if (req.headers['x-requested-with'] === 'XMLHttpRequest') {
this.loadData(req, res, 0);
} else if (req.headers['x-requested-load'] === 'XMLHttpRequest1') {
this.loadData(req, res, 1);
} else {
console.log("[405] " + req.method + " to " + req.url);
res.writeHead(405, "Method not supported", { 'Content-Type': 'text/html' });
res.end('<html><head><title>405 - Method not supported</title></head><body><h1>Method not supported.</h1></body></html>');
}
} else if (req.url.indexOf('/javascripts/') >= 0) {
this.render(req.url.slice(1), 'application/ecmascript', httpHandler, 'utf-8');
} else if (req.url.indexOf('/css/') >= 0) {
this.render(req.url.slice(1), 'text/css', httpHandler, 'utf-8');
} else if (req.url.indexOf('/images/') >= 0) {
this.render(req.url.slice(1), 'image/jpeg', httpHandler, 'binary');
} else {
this.render('public/views/index.ejs', 'text/html', httpHandler, 'utf-8');
}
}).listen(PORT, _ => console.log('-= Work Order Server Listening at http://127.0.0.1:' + PORT + ' =-'));
}
render(path, contentType, callback, encoding) {
const FS = require('fs');
FS.readFile(__dirname + '/' + path, encoding ? encoding : 'utf-8', (err, str) => { // ternary
callback(err, str, contentType);
});
}
loadData(req, res, whichAjax) {
if (whichAjax === 1) {
const FORMIDABLE = require('formidable');
let formData = {};
new FORMIDABLE.IncomingForm().parse(req).on('field', (field, name) => {
formData[field] = name;
}).on('error', (err) => {
next(err);
}).on('end', () => {
new DATA_HANDLER().queryData(formData);
});
}
new DATA_HANDLER().loadData((docs) => {
let jsonDocs = JSON.stringify(docs);
res.writeHead(200, {'content-type': 'application/json'});
res.end(jsonDocs);
this.setEjsData(docs);
});
}
setEjsData(docs) {
this.ejsData = docs;
}
}
module.exports = app;
這是我的ejs頁面:
<div class="row">
<div class="small-12 columns">
<table>
<% if (data) { %>
<% for (let i = 0; i < data.length; i++) { %>
<tr>
<td><%= data.building %></td>
<td><%= data.roomNumber %></td>
<td><%= data.problemDesc %></td>
<td><%= data.assigned %></td>
<td><%= data.status %></td>
</tr>
<% } %>
<% } %>
</table>
</div>
</div>
錯誤是data.length為null。 我添加了if(data)塊來停止錯誤。 我沒有使用任何框架(Express或Koa)。
嘗試使用ejsData
代替ejs模板中的data
以下是上述問題中解決問題的代碼:
app.js
else if (contentType.indexOf('html') >= 0) {
res.writeHead(200, { 'Content-Type': contentType });
res.end(EJS.render(str, {
data: this.ejsData,
filename: 'index.ejs' }));
}
ejs文件:
<% for (let i = 0; i < data.length; i++) { %>
<tr>
<td><%= data[i].date %></td>
<td><%= data[i].building %></td>
<td><%= data[i].roomNumber %></td>
<td><%= data[i].problemDesc %></td>
<td><%= data[i].assigned %></td>
<td><%= data[i].status %></td>
</tr>
<% } %>
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