Express.js - 如何使用 res.render 从 Express 向客户端发送警报？ 不重新发送

Question

I want to send the alert message to client.

So, I found that.

res.send(<'alert("XXX!!!")');

In this way, I didn't use res.render();

I want to use together.

Or

I want to send alert message using res.render();

How do I this?

This is the code.

 if (err) console.log(err); if (flag === 1) { //함수 이름 중복 try { //res.send('<script>alert("함수 이름 중복!")</script>'); LoadDB(res); } catch (exception) {} } else { //(4) 데이터베이스 insert 쿼리 var query = "insert into automation_script set ?"; conn.query(query, set, function (error, result, fields) { if (error) { console.log('Insert_DB error' + error); } else { try { LoadDB(res); } catch (exception) {} } }); } //(5) 데이터베이스 해제 conn.end();

Thanks you.

Answer 1

There are a lot of problems here. For one I'm not sure you understand how try catch blocks work. You have an unnecessary amount of ifs that aren't being handled too. Those problems aside, the answer to the question you asked is a websocket. From the looks of your code and question, I think what you're really looking for is how to send a response from an http get request in express. There are many ways to solve the problem you are asking to be solved. From the code I see above I don't think you have a good understanding of client/server models and It would be to your benefit to read up on how http works. I also can't answer your question because the code snippet you pasted does not provide enough context to answer your question. Most importantly though, alert is not a function in node. calling alert does nothing. In fact when you do res(alert("something")), if alert is defined in your global namespace (I hope it isn't), you are sending back undefined. There is such a thing as isomorphism, however, web api functions are exclusive to the client. I hope that helps.

Answer 2

res.send( <script>alert("your alert message"); window.location.href = "/page_location"; </script> );

Answer 3

res.send("alert("your alert message"); window.location.href = "/page_location"; ");

same answer as M.HUSSAIN only he forgot the string quotes aroud the expression