Question

我在Ejs框架中有nodejs应用程序，我是java脚本的新手，我需要知道在Node.js中设置flash消息的正确方法是什么

我的代码在下面给出了一个错误，如下所示：

＆＃13;

C:\Users\sad\Desktop\Node Application\routes\users.js:57
      req.flash('error_mesg', 'A User with this name already exisit !!')
         ^

TypeError: Cannot read property 'flash' of null
    at Request._callback (C:\Users\as\Desktop\Node Application\routes\users.js:57:10)
    at Request.self.callback (C:\Users\sa\Desktop\Node Application\node_modules\request\request.js:188:22)
    at emitTwo (events.js:106:13)
    at Request.emit (events.js:191:7)
    at Request.<anonymous> (C:\Users\sd\Desktop\Node Application\node_modules\request\request.js:1171:10)
    at emitOne (events.js:96:13)
    at Request.emit (events.js:188:7)
    at IncomingMessage.<anonymous> (C:\Users\sd\Desktop\Node Application\node_modules\request\request.js:1091:12)
    at IncomingMessage.g (events.js:291:16)
    at emitNone (events.js:91:20)
    at IncomingMessage.emit (events.js:185:7)
    at endReadableNT (_stream_readable.js:974:12)
    at _combinedTickCallback (internal/process/next_tick.js:74:11)
    at process._tickCallback (internal/process/next_tick.js:98:9)

＆＃13;

以下是我启动所有内容的代码：

＆＃13;

var flash = require('connect-flash');

// Global VArs
app.use(function (req, res, next) {
  res.locals.success_msg = req.flash('success_msg');
  res.locals.error_msg = req.flash('error_msg');
  res.locals.error = req.flash('error');
  next();
});

＆＃13;

这里是我的代码，我真正应用它：

＆＃13;

var errors = req.validationErrors();

if(errors){
  res.render('register' ,{
    errors:errors
  })
}else{

   var newUser = {first_name,last_name, role,email,password,company,role}
   request({
       url: "http://127.0.0.1:8000/v1/dashboard/register/",
       method: "POST",
       json: true,   // <--Very important!!!
       body: newUser
   }, function (req, res, err, body){
      var status = res['statusCode']
       console.log(typeof(status));
       if (status = '400'){
       req.flash('error_mesg', 'A User with this name already exisit !!')


}

   });
 }

＆＃13;

这类问题有一些相关的答案，但没有具体的flash消息。

这是我的html：{{#if error_msg}} <div class="alert alert-danger">{{error_msg}}</div> {{/if}}

Answer 1

假设你发布的最后一段代码是一个快速端点的主体，我猜你在回调到select时覆盖了你的快速回调变量req和res。此外，这不是request库回调的当前函数签名，它应该是request，而不是function (error, response, body)。修复函数签名，使用唯一的变量名称，它应该工作：

function (req, res, err, body)

在Express.js中显示Flash消息的最佳方法是什么？

1 个答案: