What Could Be Causing c.HTML to Not Work in GetQuizController of Gin Router?

Question

I am new to golang. I am creating quiz application in gin framework of golang. After fetching questions from database when I try to render questions in html page using c.HTML(), c.HTML() is not working. I dont know why. In other controllers I have done the same thing it works fine, but in GetQuizController it is not working. Please help me.

https://github.com/Shashwat5522/quizzapp

router code

r := gin.Default()
r.LoadHTMLGlob("views/*")
Teacher := r.Group("/teacher", SessionHandler)
    {
        Teacher.GET("/teacherpanel", controllers.TeacherPanelController)
        Teacher.GET("/createquizz", controllers.CreateQuizController)
        Teacher.POST("/createquizz", controllers.PostQuizController)
        Teacher.GET("/addstudent", controllers.AddStudentController)
        Teacher.POST("/addstudent", controllers.PostStudentController)
        Teacher.GET("/listofquiz", controllers.GetListOfQuizController)
        Teacher.GET("/quiz",controllers.GetQuizController)
    }

controller code

func GetQuizController(c *gin.Context) {

    fmt.Println("get quiz controller called")
    quizname := c.Query("quizname")
    var questions []models.Questions
    dbconnection.DB.Debug().Model(&models.Quiz{}).Select("quizzes.quiz_name,questions.question,questions.option_a,questions.option_b,questions.option_c,questions.option_d,questions.answer,questions.difficulty").Joins("inner join questions on questions.quiz_id=quizzes.id").Where("quizzes.quiz_name=?", quizname).Scan(&questions)
    fmt.Println(questions)

    c.HTML(200,"showquiz.html",gin.H{
        "data":questions,
    })
}

Here in this GetQuizController c.HTML is not working. Please help me.

@ZekeLu I want user directed towards showquiz.html file but nothing is happening. controller is called properly and questions are also get loaded but c.html is completely getting skipped. — Mehta Shashwat, May 28 '23 at 07:58

score 0 · Answer 1 · answered May 28 '23 at 16:07

It seems that you don't know how to describe the issue so I will describe what I have done and the issues I have found. If you think that you have encountered other issues, please edit your question to describe what you have done and what is wrong like the one below.

start a mysql server with docker:

docker run -d --name mariadb -e MARIADB_ROOT_PASSWORD=root -p 3306:3306 mariadb:10.11.2

create a database named quizzapplication:

docker exec mariadb mysql --password=root -e 'CREATE DATABASE quizzapplication;'

clone the repository (the commit is bfda880):

git clone https://github.com/Shashwat5522/quizzapp.git

change the working directory
```
cd quizzapp/Quizz-Application
```
add missing modules and remove unused modules
```
go mod tidy
```
The go.mod file requires gorm.io/driver/postgres, but the source code imports gorm.io/driver/mysql. Run go mod tidy to correct it.
migrate the database
```
go run ./migration
```
start the web server:
```
go run .
```

open a new terminal and send a request:

curl 'http://localhost:8080/teacher/quiz'

The output is:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Login-Form</title>
</head>
<body>
<h1>Login-Form</h1>
    <form action="/authentication/Login" method="post">
        <label for="email">Email</label>
        <input type="email" id="email" name="email"><br>
        <label for="password">Password</label>
        <input type="text" id="password" name="password"><br>


        <input type="submit" value="submit">
    </form>
    <h1></h1>
</body>
</html><h1>Show quizz</h1>

<h1>Show quizz</h1> is rendered after the </html> tag. This is not a valid HTML. That's because you haven't called c.Abort() in SessionHandler. It could be fixed like this:

  func SessionHandler(c *gin.Context) {
    fmt.Println("session is called")

    session := sessions.Default(c)
    fmt.Println(session.Get("userID"))
    if session.Get("userID") == nil {
        c.HTML(200, "login.html", nil)
+       c.Abort()
    }
  }

I believe there are other issues in the source code. But I won't review the full project and find out all of them. This is merely a demo to show how to describe an issue clearly.

And bear in mind that, please keep the question focus. It's bad to post a project full of issues and ask others to find them out.

What Could Be Causing c.HTML to Not Work in GetQuizController of Gin Router?

1 Answers1