node.js Express.js 路由：可选的 splat 参数？
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Express.js routing: optional splat param?
提问by Jesse
I have a route that looks like this:
我有一条看起来像这样的路线：
app.all('/path/:namedParam/*splat?',function(req,res,next){
if(!req.params.length){
// do something when there is no splat
} else {
// do something with splat
}
});
however, this doesn't work - if I call path/foo/barit hits the route, but if I call path/foo, it doesn't.
但是，这不起作用 - 如果我调用path/foo/bar它会命中路线，但如果我调用path/foo它，则不会。
Is it possible to have an optional splat param, or do I have to use a regex to detect this?
是否可以有一个可选的 splat 参数，或者我是否必须使用正则表达式来检测这个？
Edit:
编辑：
to be clearer, here are the requirements I'm trying to achieve:
更清楚地说，这里是我想要达到的要求：
- the first and second params are required
- the first param is static, the second is a named param.
- any number of optionaladditional params can be appended and still hit the route.
- 第一个和第二个参数是必需的
- 第一个参数是静态的，第二个是命名参数。
- 可以附加任意数量的可选附加参数并且仍然命中路由。
回答by Chris
This works for /path and /path/foo on express 4, note the *before ?.
这适用于 express 4 上的 /path 和 /path/foo ，请注意*之前的?.
router.get('/path/:id*?', function(req, res, next) {
res.render('page', { title: req.params.id });
});
回答by Andreas Hultgren
I just had the same problem and solved it. This is what I used:
我刚刚遇到了同样的问题并解决了它。这是我使用的：
app.get('path/:required/:optional?*', ...)
This should work for path/meow, path/meow/voof, path/meow/voof/moo/etc...
这应该适用于path/meow, path/meow/voof, path/meow/voof/moo/etc...
It seems by dropping the /between ?and *, the last /becomes optional too while :optional?remains optional.
似乎通过删除/between?和*，最后一个也/变成可选的，而:optional?仍然是可选的。
回答by Dave Ward
Will this do what you're after?
这会做你想要的吗？
app.all('/path/:namedParam/:optionalParam?',function(req,res,next){
if(!req.params.optionalParam){
// do something when there is no optionalParam
} else {
// do something with optionalParam
}
});
More on Express' routing here, if you haven't looked: http://expressjs.com/guide/routing.html
更多关于 Express 的路由在这里，如果你还没有看过：http: //expressjs.com/guide/routing.html
回答by Jesse
Here's the current way I'm solving this problem, it doesn't appear that express supports any number of splat params with an optional named param:
这是我解决这个问题的当前方法，express 似乎不支持任意数量的带有可选命名参数的 splat 参数：
app.all(/\/path\/([^\/]+)\/?(.+)?/,function(req,res,next){
// Note: this is all hacked together because express does not appear to support optional splats.
var params = req.params[1] ? [req.params[1]] : [],
name = req.params[0];
if(!params.length){
// do something when there is no splat
} else {
// do something with splat
}
});
I'd love to have this use named params for readability and consistency - if another answer surfaces that allows this I'll accept it.
我很乐意将这种名为 params 的用途用于可读性和一致性——如果另一个答案允许这样做，我会接受它。
回答by yaya
Suppose you have this url: /api/readFile/c:/a/a.txt
假设你有这个网址： /api/readFile/c:/a/a.txt
If you want req.params.pathto be c::
如果你想req.params.path成为c:：
'/api/readFile/:path*
If you want req.params.pathto be c:/a/a.txt:
如果你想req.params.path成为c:/a/a.txt：
'/api/readFile/:path([^/]*)'
回答by williamli
I got around this problem by using a combination of a middleware that add trailing slashes to url and router.get('/bar/*?', ..., which will pick up everything after /bar/, and return undefinedif it is just /bar/. If the visitor asked for /bar, the express-slashmiddleware will add a slash to the request and turns the request into /bar/.
我通过使用中间件的组合来解决这个问题，该中间件将尾部斜杠添加到 url 和router.get('/bar/*?', ...，它将在 之后拾取所有内容/bar/，undefined如果只是/bar/. 如果访问者提出请求/bar，express-slash中间件会在请求中添加斜杠并将请求转换为/bar/.
回答by windmaomao
The above solutions using optional doesn't work in Express 4. And I tried couple of ways using search patterns, but not working either. And then I found this method and seems fired for unlimited nested path, http://expressjs.com/api.html#router
上述使用 optional 的解决方案在 Express 4 中不起作用。我尝试了几种使用搜索模式的方法，但也不起作用。然后我找到了这个方法，似乎因为无限嵌套路径而被解雇，http://expressjs.com/api.html#router
// this will only be invoked if the path starts with /bar from the mount point
router.use('/bar', function(req, res, next) {
// ... maybe some additional /bar logging ...
// to get the url after bar, you can try
var filepath = req.originalUrl.replace(req.baseUrl, "");
next();
});
It's match all /bar, /bar/z, /bar/a/b/c etc. And after that, you can read req.originalUrl, since params are not filled, ex. you can try compare baseUrl and originalUrl to get the remaining path.
它匹配所有 /bar、/bar/z、/bar/a/b/c 等。之后，您可以阅读 req.originalUrl，因为没有填充参数，例如。您可以尝试比较 baseUrl 和 originalUrl 以获取剩余路径。
