CODEWITHSUNDEEP
javaspringspring-mvcjspjstl
Nikrango
Nikrango

Reputation: 97

How to pass a variable from html select as a PathVariable?

I have a form like this:

<form action="/list/${tableName}" method="post">
<p>
<select name="tableName">
<option value="employees">Employees</option>
<option value="contracts">Contracts</option>
</select>
</p>
<input type="submit" value="Submit" />
</form>

and on the controller side:

    @RequestMapping(value = "/list/{tableName}", method = { RequestMethod.POST, RequestMethod.GET })
    public String getTables(Model m, @PathVariable("tableName") String tableName) {
...
//findAll here
...
return "home";
}

It writes "not found" P.S.: what is now @PathVariable used to be @RequestParam as I'm using it in the body as well. How do I pass the options as a variable to the controller so that I get list/employees and list/contracts when I list the table data with findAll?

Upvotes: 0

Views: 3813

Answers (2)

Robin Rozo
Robin Rozo

Reputation: 154

Just use the @RequestParam annotation.

As described in the documentation:

You can use the @RequestParam annotation to bind Servlet request parameters (that is, query parameters or form data) to a method argument in a controller. https://docs.spring.io/spring/docs/5.2.0.M1/spring-framework-reference/web.html#mvc-ann-requestparam

The form:

<form action="/list">
  <select name="tableName">
    <option value="employees">Employees</option>
    <option value="contracts">Contracts</option>
  </select>
  <input type="submit" value="Submit" />
</form>

The controller:

@RequestMapping(value = "/list", method = RequestMethod.GET)
public String getTables(Model m, @RequestParam("tableName") String tableName) {
  //findAll here
  return "home";
}

If your request does not have any side-effect on the server (is read only request), good pratice is to use a GET method.

Upvotes: 0

Karol Katanowski
Karol Katanowski

Reputation: 186

@RequestParam is use for query parameter(static values) like: http://localhost:8080/calculation/pow?base=2&ext=4

@PathVariable is use for dynamic values like : http://localhost:8080/calculation/sqrt/8

@RequestMapping(value="/pow", method=RequestMethod.GET)
public int pow(@RequestParam(value="base") int base1, @RequestParam(value="ext") int ext1){
    int pow = (int) Math.pow(base1, ext1);
    return pow;
}

@RequestMapping("/sqrt/{num}")
public double sqrt(@PathVariable(value="num") int num1){
    double sqrtnum=Math.sqrt(num1);
    return sqrtnum;
}

Here is link for more about that @PathVariable vs @RequestParam

To solve Your problem You need to see (like in debug mode) if your method findAll is actually returning some data and how You then send this data to the view.

Upvotes: 1

Related Questions