blocks|key|14404|text|您可以通过查询字符串传递少量的键/值对数据：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|14405|res.redirect('/?error=denied');|code-block|syntax|javascript|14406|并且主页上的javascript可以访问它并相应地调整它的行为。|14407|请注意，如果你不介意/category停留在浏览器地址栏中作为网址，你可以直接呈现而不是重定向。很多时候人们使用重定向是因为旧的web框架使得直接响应变得困难，但是在express中它很容易：|offset|length|style|CODE|14408|app.post('/category',+function(req,+res)+{

++//+Process+the+data+received+in+req.body

++res.render('home.jade',+{error:+'denied'});
});|14409|正如@Dropped.on.Caprica评论的那样，使用AJAX消除了网址更改的问题。|14410|entityMap^0|0|0|0|A|9|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|X|8|@$K|Y|L|Z|M|N]]|9|@]|A|$]]|$1|O|3|P|5|D|7|10|8|@]|9|@]|A|$E|F]]|$1|Q|3|R|5|6|7|11|8|@]|9|@]|A|$]]|$1|S|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|T|$]]

You can pass small bits of key/value pair data via the query string:

<pre><code>res.redirect('/?error=denied');
</code></pre>

And javascript on the home page can access that and adjust its behavior accordingly.

Note that if you don't mind <code>/category</code> staying as the URL in the browser address bar, you can just render directly instead of redirecting. IMHO many times people use redirects because older web frameworks made directly responding difficult, but it's easy in express:

<pre><code>app.post('/category', function(req, res) {

 // Process the data received in req.body

 res.render('home.jade', {error: 'denied'});
});
</code></pre>

As @Dropped.on.Caprica commented, using AJAX eliminates the URL changing concern.

blocks|key|14459|text|有几种方法可以将数据传递到不同的路由。当然，最正确的答案是查询字符串。您需要确保这些值是正确的encodeURIComponent和decodeURIComponent。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|14460|app.get('/category',+function(req,+res)+{
++var+string+=+encodeURIComponent('something+that+would+break');
++res.redirect('/?valid='+%2B+string);
});|code-block|syntax|javascript|14461|您可以通过使用req.query获取发送的参数，从而在您的另一个路由中截获这一点。|style|CODE|14462|app.get('/',+function(req,+res)+{
++var+passedVariable+=+req.query.valid;
++//+Do+something+with+variable
});|14463|对于更动态的方式，您可以使用url核心模块为您生成查询字符串：|14464|const+url+=+require('url');++++
app.get('/category',+function(req,+res)+{
++++res.redirect(url.format({
+++++++pathname:"/",
+++++++query:+{
++++++++++"a":+1,
++++++++++"b":+2,
++++++++++"valid":"your+string+here"
++++++++}
+++++}));
+});|14465|因此，如果要重定向所有请求查询字符串变量，只需执行以下操作|14466|res.redirect(url.format({
+++++++pathname:"/",
+++++++query:req.query,
+++++});
+});|14467|如果您使用的是Node+>=+7.x，还可以使用querystring核心模块|14468|const+querystring+=+require('querystring');++++
app.get('/category',+function(req,+res)+{
++++++const+query+=+querystring.stringify({
++++++++++"a":+1,
++++++++++"b":+2,
++++++++++"valid":"your+string+here"
++++++});
++++++res.redirect('/?'+%2B+query);
+});|14469|另一种方法是在会话中设置一些内容。You+can+read+how+to+set+it+up+here，但设置和访问变量的方法如下：|14470|app.get('/category',+function(req,+res)+{
++req.session.valid+=+true;
++res.redirect('/');
});|14471|后来在重定向之后...|14472|app.get('/',+function(req,+res)+{
++var+passedVariable+=+req.session.valid;
++req.session.valid+=+null;+//+resets+session+variable
++//+Do+something
});|14473|还有一种选择是使用Express的旧功能req.flash。在较新版本的Express中执行此操作将要求您使用其他库。本质上，它允许您设置变量，这些变量将在您下一次访问页面时显示并重置。它可以方便地向用户显示错误，但默认情况下，它已被删除。编辑：Found+a+library+that+adds+this+functionality.|14474|希望这能让您对如何在Express应用程序中传递信息有一个大致的了解。|14475|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/encodeURIComponent|1|https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/decodeURIComponent|2|https://nodejs.org/api/url.html|3|https://nodejs.org/api/querystring.html|4|http://blog.modulus.io/nodejs-and-express-sessions|5|https://github.com/jaredhanson/connect-flash^0|1B|I|0|1U|I|1|0|0|7|9|0|0|E|3|E|3|2|0|0|0|0|O|B|O|B|3|0|0|H|Y|4|0|0|0|0|K|9|3F|19|5|0|0^^$0|@$1|2|3|4|5|6|7|1U|8|@]|9|@$A|1V|B|1W|1|1X]|$A|1Y|B|1Z|1|20]]|C|$]]|$1|D|3|E|5|F|7|21|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|22|8|@$A|23|B|24|K|L]]|9|@]|C|$]]|$1|M|3|N|5|F|7|25|8|@]|9|@]|C|$G|H]]|$1|O|3|P|5|6|7|26|8|@$A|27|B|28|K|L]]|9|@$A|29|B|2A|1|2B]]|C|$]]|$1|Q|3|R|5|F|7|2C|8|@]|9|@]|C|$G|H]]|$1|S|3|T|5|6|7|2D|8|@]|9|@]|C|$]]|$1|U|3|V|5|F|7|2E|8|@]|9|@]|C|$G|H]]|$1|W|3|X|5|6|7|2F|8|@$A|2G|B|2H|K|L]]|9|@$A|2I|B|2J|1|2K]]|C|$]]|$1|Y|3|Z|5|F|7|2L|8|@]|9|@]|C|$G|H]]|$1|10|3|11|5|6|7|2M|8|@]|9|@$A|2N|B|2O|1|2P]]|C|$]]|$1|12|3|13|5|F|7|2Q|8|@]|9|@]|C|$G|H]]|$1|14|3|15|5|6|7|2R|8|@]|9|@]|C|$]]|$1|16|3|17|5|F|7|2S|8|@]|9|@]|C|$G|H]]|$1|18|3|19|5|6|7|2T|8|@$A|2U|B|2V|K|L]]|9|@$A|2W|B|2X|1|2Y]]|C|$]]|$1|1A|3|1B|5|6|7|2Z|8|@]|9|@]|C|$]]|$1|1C|3|-4|5|6|7|30|8|@]|9|@]|C|$]]]|1D|$1E|$5|1F|1G|1H|C|$1I|1J]]|1K|$5|1F|1G|1H|C|$1I|1L]]|1M|$5|1F|1G|1H|C|$1I|1N]]|1O|$5|1F|1G|1H|C|$1I|1P]]|1Q|$5|1F|1G|1H|C|$1I|1R]]|1S|$5|1F|1G|1H|C|$1I|1T]]]]

There are a few ways of passing data around to different routes. The most correct answer is, of course, query strings. You'll need to ensure that the values are properly <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/encodeURIComponent" rel="noreferrer">encodeURIComponent</a> and <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/decodeURIComponent" rel="noreferrer">decodeURIComponent</a>.

<pre><code>app.get('/category', function(req, res) {
 var string = encodeURIComponent('something that would break');
 res.redirect('/?valid=' + string);
});
</code></pre>

You can snag that in your other route by getting the parameters sent by using <code>req.query</code>.

<pre><code>app.get('/', function(req, res) {
 var passedVariable = req.query.valid;
 // Do something with variable
});
</code></pre>

For more dynamic way you can use the <a href="https://nodejs.org/api/url.html" rel="noreferrer"><code>url</code></a> core module to generate the query string for you:

<pre><code>const url = require('url'); 
app.get('/category', function(req, res) {
 res.redirect(url.format({
 pathname:"/",
 query: {
 "a": 1,
 "b": 2,
 "valid":"your string here"
 }
 }));
 });
</code></pre>

So if you want to redirect all req query string variables you can simply do 

<pre><code>res.redirect(url.format({
 pathname:"/",
 query:req.query,
 });
 });
</code></pre>

And if you are using Node >= 7.x you can also use the <a href="https://nodejs.org/api/querystring.html" rel="noreferrer"><code>querystring</code></a> core module

<pre><code>const querystring = require('querystring'); 
app.get('/category', function(req, res) {
 const query = querystring.stringify({
 "a": 1,
 "b": 2,
 "valid":"your string here"
 });
 res.redirect('/?' + query);
 });
</code></pre>

Another way of doing it is by setting something up in the session. <a href="http://blog.modulus.io/nodejs-and-express-sessions" rel="noreferrer">You can read how to set it up here</a>, but to set and access variables is something like this:

<pre><code>app.get('/category', function(req, res) {
 req.session.valid = true;
 res.redirect('/');
});
</code></pre>

And later on after the redirect...

<pre><code>app.get('/', function(req, res) {
 var passedVariable = req.session.valid;
 req.session.valid = null; // resets session variable
 // Do something
});
</code></pre>

There is also the option of using an old feature of Express, <code>req.flash</code>. Doing so in newer versions of Express will require you to use another library. Essentially it allows you to set up variables that will show up and reset the next time you go to a page. It's handy for showing errors to users, but again it's been removed by default. EDIT: <a href="https://github.com/jaredhanson/connect-flash" rel="noreferrer">Found a library that adds this functionality.</a>

Hopefully that will give you a general idea how to pass information around in an Express application.

blocks|key|230820|text|我找到的在routeHandlers之间传递数据的最简单的方法是使用next()，不需要处理重定向或会话。或者，您可以只调用homeCtrl(req,res)而不是next()，并只传递req和res|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|230821|var+express++=+require('express');
var+jade+++++=+require('jade');
var+http+++++=+require("http");


var+app++++=+express();
var+server+=+http.createServer(app);

/////////////
//+Routing+//
/////////////

//+Move+route+middleware+into+named
//+functions
function+homeCtrl(req,+res)+{

++++//+Prepare+the+context
++++var+context+=+req.dataProcessed;
++++res.render('home.jade',+context);
}

function+categoryCtrl(req,+res,+next)+{

++++//+Process+the+data+received+in+req.body
++++//+instead+of+res.redirect('/');
++++req.dataProcessed+=+somethingYouDid;
++++return+next();
++++//+optionally+-+Same+effect
++++//+accept+no+need+to+define+homeCtrl
++++//+as+the+last+piece+of+middleware
++++//+return+homeCtrl(req,+res,+next);
}

app.get('/',+homeCtrl);

app.post('/category',+categoryCtrl,+homeCtrl);|code-block|syntax|javascript|230822|entityMap^0|Y|6|1Q|H|2A|6|2L|3|2P|3|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]|$9|R|A|S|B|C]|$9|T|A|U|B|C]|$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Y|8|@]|D|@]|E|$]]]|L|$]]

The easiest way I have found to pass data between routeHandlers to use <code>next()</code> no need to mess with redirect or sessions.
Optionally you could just call your <code>homeCtrl(req,res)</code> instead of <code>next()</code> and just pass the <code>req</code> and <code>res</code>

<pre><code>var express = require('express');
var jade = require('jade');
var http = require("http");


var app = express();
var server = http.createServer(app);

/////////////
// Routing //
/////////////

// Move route middleware into named
// functions
function homeCtrl(req, res) {

 // Prepare the context
 var context = req.dataProcessed;
 res.render('home.jade', context);
}

function categoryCtrl(req, res, next) {

 // Process the data received in req.body
 // instead of res.redirect('/');
 req.dataProcessed = somethingYouDid;
 return next();
 // optionally - Same effect
 // accept no need to define homeCtrl
 // as the last piece of middleware
 // return homeCtrl(req, res, next);
}

app.get('/', homeCtrl);

app.post('/category', categoryCtrl, homeCtrl);
</code></pre>

blocks|key|14532|text|下面是我的建议，不使用任何其他依赖项，只使用node和express，使用app.locals，下面是一个示例：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|14533|++++app.get("/",+function(req,+res)+{
++++++++var+context+=+req.app.locals.specialContext;
++++++++req.app.locals.specialContext+=+null;
++++++++res.render("home.jade",+context);+
++++++++//+or+if+you+are+using+ejs
++++++++res.render("home",+{context:+context});+
++++});

++++function+middleware(req,+res,+next)+{
++++++++req.app.locals.specialContext+=+*+your+context+goes+here+*
++++++++res.redirect("/");
++++}|code-block|syntax|javascript|14534|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Here s what I suggest without using any other dependency , just node and express, use app.locals, here s an example :

<pre><code> app.get("/", function(req, res) {
 var context = req.app.locals.specialContext;
 req.app.locals.specialContext = null;
 res.render("home.jade", context); 
 // or if you are using ejs
 res.render("home", {context: context}); 
 });

 function middleware(req, res, next) {
 req.app.locals.specialContext = * your context goes here *
 res.redirect("/");
 }
</code></pre>

blocks|key|14592|text|使用app.set和app.get|type|unstyled|depth|inlineStyleRanges|entityRanges|data|14593|设置数据|14594|router.get(
++"/facebook/callback",
++passport.authenticate("facebook"),
++(req,+res)+=>+{
++++req.app.set('user',+res.req.user)
++++return+res.redirect("/sign");
++}
);|code-block|syntax|javascript|14595|获取数据|14596|router.get("/sign",+(req,+res)+=>+{
++console.log('sign',+req.app.get('user'))
});|14597|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

use app.set &amp; app.get

Setting data

<pre><code>router.get(
 "/facebook/callback",
 passport.authenticate("facebook"),
 (req, res) =&gt; {
 req.app.set('user', res.req.user)
 return res.redirect("/sign");
 }
);
</code></pre>

Getting data

<pre><code>router.get("/sign", (req, res) =&gt; {
 console.log('sign', req.app.get('user'))
});

</code></pre>

blocks|key|230966|text|+app.get('/category',+function(req,+res)+{
++var+string+=+query
++res.redirect('/?valid='+%2B+string);
});|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|230967|在ejs中，您可以直接使用valid：|unstyled|230968|<%25+var+k+=+valid+%25>|230969|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|L|8|@]|9|@]|A|$]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$B|C]]|$1|I|3|-4|5|F|7|N|8|@]|9|@]|A|$]]]|J|$]]

<pre><code> app.get('/category', function(req, res) {
 var string = query
 res.redirect('/?valid=' + string);
});
</code></pre>
in the ejs you can directly use valid:
<pre><code>&lt;% var k = valid %&gt;
</code></pre>

blocks|key|14706|text|更新2021:我尝试了url.format和querystring，它们都被弃用，我们可以使用URLSearchParams|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|14707|const+{URLSearchParams}+=+require('url')
+++++++++++++++
app.get('/category',+(req,+res)+=>{
++++const+pathname+=+'/?'
++++const+components+={
++++a:"a",
++++b:"b"
}

++++const+urlParameters+=+new+URLSearchParams(components)
++++res.redirect(pathname+%2B+urlParameters)
})|code-block|syntax|javascript|14708|entityMap^0|B|A|M|B|1B|F|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]|$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|U|8|@]|D|@]|E|$]]]|L|$]]

Update 2021:
i tried <code>url.format</code> and <code>querystring</code> and both of them are deprecated, instead we can use <code>URLSearchParams</code>
<pre><code>const {URLSearchParams} = require('url')
 
app.get('/category', (req, res) =&gt;{
 const pathname = '/?'
 const components ={
 a:&quot;a&quot;,
 b:&quot;b&quot;
}

 const urlParameters = new URLSearchParams(components)
 res.redirect(pathname + urlParameters)
})
</code></pre>

I am using express to make a web app in node.js. This is a simplification of what I have:

<pre><code>var express = require('express');
var jade = require('jade');
var http = require("http");


var app = express();
var server = http.createServer(app);

app.get('/', function(req, res) {
 // Prepare the context
 res.render('home.jade', context);
});

app.post('/category', function(req, res) {
 // Process the data received in req.body
 res.redirect('/');
});
</code></pre>

My problem is the following:

If I find that the data sent in <code>/category</code> doesn't validate, I would like pass some additional context to the <code>/</code> page. How could I do this? Redirect doesn't seem to allow any kind of extra parameter.

How do I redirect in expressjs while passing some context?

路由

我正在使用express在node.js中制作一个web应用程序。这是我所拥有的东西的简化：var express = require('express');var jade = require('jade');var http = require("http");var app = express();var ser...

问如何在传递上下文的同时在expressjs中重定向？
EN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问如何在传递上下文的同时在expressjs中重定向？EN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问如何在传递上下文的同时在expressjs中重定向？
EN