Passing javascript variable to spring MVC controller with request param

Question

Is it possible to send a javascript variable to a controller endpoint, and then have the controller return a new view? I've tried using a requestbody and ajax to do it, which passes the variable correctly, but is unable to load a new view.

Maybe there's a way to do it with thymeleaf?

@RequestParam can be used to pass values.May be you can share some more info and some code to have better understanding of the problem you are facing. — Cozimetzer
– Cozimetzer, Commented Dec 5, 2021 at 23:27
I have a controller method that I wish to pass a variable from a javascript function. ``` @GetMapping("/project/task") public String test(@RequestParam long id) { // create model from task id that goes to new view page return "taskpage"; } ``` The javascript function retrieves the variable (task id), when clicking on a task (gantt diagram from google charts api). ``` $.ajax({ contentType: "application/json", type: "GET", data: taskId url: "/project/task/"+id, }); } ``` It doesnt work without requestbody (which doesnt load the new page) — Kenned Larsen
– Kenned Larsen, Commented Dec 5, 2021 at 23:38
From Javascript you are passing id in the url. So you can use @PathVariable to get it in controller. @GetMapping(“project/task/{id}”) public String test(@PathVariable Long id) — Cozimetzer
– Cozimetzer, Commented Dec 5, 2021 at 23:44
@Cozimetzer That almost works, except it still won't load the new html page, but stays on the same page.. hmm.. — Kenned Larsen
– Kenned Larsen, Commented Dec 5, 2021 at 23:58

Dropout · Accepted Answer · 2021-12-13 14:00:05Z

If you're using Thymeleaf then just reference the template you want to return to the user by its filename.

@Controller
public class YourController {

    @GetMapping("/someUrl")
    public String getTemplate(@RequestParam String templateName){
        return templateName;
    }
}

This would be the bare minimum that you'd need, assuming your templates are in the correct folder - by default in resources/static. If the frontend sends a GET (/someUrl?templateName=xyz) to the backend, it would return the xyz.html from your templates. If it does not find the template that was requested in the parameters then it will return a 404.

Edit: Reading through the comments I realized there might be a confusion between @RequestParam and @PathVariable. In case you want to use a path variable to define the template name, so that the frontend can call GET (/someUrl/xyz), then you can do

@Controller
public class YourController {

    @GetMapping("/someUrl/{templateName}")
    public String getTemplate(@PathVariable String templateName){
        return templateName;
    }
}

Resources for both below:

https://www.baeldung.com/spring-request-param

https://www.baeldung.com/spring-pathvariable

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