在/
视图中,我从mongodb获取文档,并为每个仅显示日期和前几个单词的文档创建一个列表项。我希望能够单击每个列表项以转到新页面/view
,以查看该特定文档的其余部分。
为此,我相信我需要在item
和/
之间传递/view
,然后在那里访问item
的属性。如何使用pagelist
功能(或没有它)执行此操作?
index.js:
var express = require('express');
var exphbs = require('express-handlebars');
var bodyParser = require('body-parser');
var app = express();
var hbs = exphbs.create({
helpers: {
message: function() {return 'Welcome!';},
doc: function() {return "Something went wrong.";}
}
});
app.engine('handlebars', hbs.engine);
app.set('view engine', 'handlebars');
app.use(bodyParser.urlencoded({ extended: true }));
app.use(bodyParser.json());
const MongoClient = require('mongodb').MongoClient;
var assert = require('assert');
var util=require('util');
const url = 'mongodb://localhost:27017/users';
const dbName = 'users';
var db;
MongoClient.connect(url, function(err, client) {
assert.equal(null, err);
console.log("Connected successfully to server");
db = client.db(dbName);
db.collection("reviewYelp2", { }, function(err, coll) {
if (err != null) {
console.log(err)
db.createCollection("reviewYelp2", function(err, result) {
assert.equal(null, err);
});
}
db.ensureIndex("reviewYelp2", { document: "text"}, function(err, indexname) {
assert.equal(null, err);
});
});
});
app.get("/", function(req, res) {
res.render('search');
});
app.get("/view", function(req, res) {
// NEED TO BE ABLE TO ACCESS CLICKED ITEM HERE
res.render('viewItem', {
// Change to access item.text when I have access to item
helpers: {
doc: function() {return "Viewing doc...";}
}
});
});
app.post("/", function(req, res) {
db.collection('reviewYelp2').find({
text: new RegExp(req.body.query)
}).sort({date: 1}).toArray(function(err, items) {
res.render('search', {
helpers: {
message: function() {return pagelist(items);}
}
});
})
});
function pagelist(items) {
result = "<ul>";
items.forEach(function(item) {
// Grab only first 10 words of text
textSlice = item.text.split(" ");
textSlice = textSlice.slice(0, 5);
text = textSlice.join(" ");
str = "<li class="+item._id+"><a href='/view'>" + item.date + " " + text + "...</a></li>";
result = result + str;
});
result = result + "</ul>";
return result;
}
app.listen(3000, function() {
console.log("App listening on localhost:3000");
});
search.handlebars:
<!DOCTYPE html>
<html>
<body>
<form method="post">
<input type="text" size="80" name="query" />
<input type="submit" value="Search" class="submitButton" />
{{{ message }}}
</form>
</body>
</html>
viewItem.handlebars:
<!DOCTYPE html>
<html>
<body>
<button onclick="window.history.back()">Go back to list</button>
{{{ doc }}}
</body>
</html>
答案 0 :(得分:1)
这是有问题的,因为http基本上是无状态的 - 即每个对服务器的请求都是它自己的事情。您可以提出涉及cookie或本地存储的方案,但我认为更简单的方法更好,更常见。
一个更简单的想法是拥有一个带有某种id参数的路由:
require(knitr)
require(kableExtra)
kable(mtcars, "html") %>%
kable_styling(bootstrap_options = c("striped", "hover"))
现在,在索引上,您可以看到如下链接列表:
app.get("/view_detail/:itemID", function(req, res) {
var item = req.params.itemID
// lookup detail about item based on itemID
res.render('viewItem', {
// send data
});
});