在express节点js中实现一个简单的搜索栏 [英] implement a simple search bar in express node js

问题描述

所以我尝试实现一种简单的搜索功能进行练习，

so i've tried to implement a simple search functionality to practice,

我的目标是拥有网址"/search/(此处的参数)"，并获取名称与参数匹配的产品.

my goal is to have the url "/search/(parameter here)" and get the product who's name matches the parameter.

这是我的中间件:

router.get('/search/:title', function(req, res, next) {
    var title = req.params.title;
    Product.find({title: title}, function (err, products) {
        if(err) {
            res.render('shop/search', {products: null});
        }
        res.render('shop/search', {products: products});
        next();
    });
});

我不知道为什么，但是它给了我错误:

i don't know why, but it gives me the error:

错误:发送标头后无法设置.

Error: Can't set headers after they are sent.

我不明白为什么要得到它，它说我正在更改标题，对此我有点陌生，我不确定在哪里更改标题?

i can't see why i get this, it says i'm changing headers, i'm kind of new to this and i'm not sure where do i change headers?

推荐答案

在将响应呈现给客户端之后，您将无法调用下一个中间件(即 next())，也应将其删除.使用 return 语句以停止执行剩余的代码，这是正确的语法:

You cannot call the next middleware ( i.e next() ) after rendering the response to the client, you should remove it, also use return statement in order to stop the remaining code from executing, here is the correct syntax:

router.get('/search/:title', function(req, res, next) {
    var title = req.params.title;
    Product.find({title: title}, function (err, products) {
        if(err) {
            return res.render('shop/search', {products: null});
            ^^^^^^
        }
        res.render('shop/search', {products: products});
    });
});

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