Thymeleaf multiple submit button in one form

问题:

I have a fragment of HTML page with one form and 2 button:

<form action="#" data-th-action="@{/action/edit}" data-th-object="${model}" method="post">
    <button type="submit" name="action" value="save">save</button>
    <button type="submit" name="action" value="cancel">cancel</button>
</form>

And the controller:

@RequestMapping(value="/edit", method=RequestMethod.POST)
public ModelAndView edit(@ModelAttribute SomeModel model, 
        @RequestParam(value="action", required=true) String action) {

    if (action.equals("save")) {
        // do something here     
    }

    if (action.equals("cancel")) {
       // do another thing
    }
    return modelAndView;
}

This work good, but if I have more button, I must add more if statement to check the action string. Is there another way that I can create one action for each button in the form?

回答1:

You can create separate methods with different @RequestMappings using the params variable.

@RequestMapping(value="/edit", method=RequestMethod.POST, params="action=save")
public ModelAndView save() {}


@RequestMapping(value="/edit", method=RequestMethod.POST, params="action=cancel")
public ModelAndView cancel() {}

回答2:

Instead of an if-case you could have a switch case, should you not want to take in every option as a new request mapping.

@RequestMapping(value="/edit", method=RequestMethod.POST)
public ModelAndView edit(@ModelAttribute SomeModel model, 
        @RequestParam(value="action", required=true) String action) {
    switch(action) {
        case "save":
            // do stuff
            break;
        case "cancel":
            // do stuff
            break;
        case "newthing":
            // do stuff
            break;
        default:
            // do stuff
            break;
    }
}

回答3:

You can know which submit button has been clicked and then act upon the button Here is the code

String btnName = request.getParameter("action");

if(btnName.equals("save"))
    // you code....
else if(btnName.equals("cancel"))
    // you code....