How can I get data from spring controller by ajax?

Question

I have an ajax on a jsp page which calls a spring controller through URL /check .

$.ajax({
    type : "GET",
    url : "${pageContext.request.contextPath}/check",
    data : {
    "id" : ${articleCount}
    },
    success: function(data){
    //response from controller
    }
});

Now, the controller looks like,

@RequestMapping("/check")
public String check(@RequestParam Integer id, HttpServletRequest request,
        HttpServletResponse response, Model model) {
    boolean a = getSomeResult();
    if (a == true) {
        model.addAttribute("alreadySaved", true);
        return view;
    } else
        model.addAttribute("alreadySaved", false);

    return view;
}

I sent data using model and tried to access it in success: function(data) as "${alreadySaved}"but it shows blank.

Is there any way I can receive that true/false data on the view page?

Luffy · Accepted Answer · 2015-10-05 11:19:26Z

9

You have to add the @ResponseBody annotation for spring ajax calls example

@RequestMapping("/check")     
@ResponseBody
public String check(@RequestParam Integer id, HttpServletRequest request, HttpServletResponse response, Model model) {
    boolean a = getSomeResult();
    if (a == true) {
        model.addAttribute("alreadySaved", true);
        return view;
    } else {
        model.addAttribute("alreadySaved", false);
        return view;
    }
}

edited Oct 5, 2015 at 11:19

Luffy

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answered Nov 7, 2014 at 6:13

Selva

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4 Comments

Sujan Over a year ago

Okay. How can I get that response on the view side?

Selva Over a year ago

that means view is empty.please return the model object as response.

Sujan Over a year ago

No, the view is not empty. The view is injected by spring from springmvc servlet. It is a string that resolves to load a JSP.

Sujan Over a year ago

I had some misconception. I got it right now. Thanks :)

Du-Lacoste · Accepted Answer · 2018-05-17 11:26:16Z

4

use @ResponseBody

Spring will bind the return value to outgoing HTTP response body when you add @ResponseBody annotation.

@ResponseBody
public String check(@RequestParam Integer id, HttpServletRequest request, HttpServletResponse response, Model model) {
    boolean a = getSomeResult();
    if (a == true) {
        return "already saved";
    } 
    return "error exist";
}

Spring will use HTTP Message converters to convert the return value to HTTP response body [serialize the object to response body], based on Content-Type used in request HTTP header.

for more info:

http://websystique.com/springmvc/spring-mvc-requestbody-responsebody-example/

answered May 17, 2018 at 11:26

Du-Lacoste

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Comments

Luffy · Accepted Answer · 2015-10-05 11:08:46Z

1

Controller part

You have to add the @ResponseBody annotation for spring ajax calls example

View Part

$.ajax({
    type : "GET",
    url : "${pageContext.request.contextPath}/check",
    data : {
        "id" : ${articleCount}
    },
    success: function(data){
        $('#input_field').val(data);
    }
});

edited Oct 5, 2015 at 11:08

Luffy

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answered Nov 7, 2014 at 6:24

tofindabhishek

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Comments

Luffy · Accepted Answer · 2015-10-05 11:18:35Z

1

When you are trying to return the values from the ajax request , you should use the @ResponseBody annotation . As your method return type is String make sure you return the string value and not your view to the jsp.

Since it will render the jsp again the response

@ResponseBody
public String check(@RequestParam Integer id, HttpServletRequest request, HttpServletResponse response, Model model) {
    boolean a = getSomeResult();
    if (a == true) {
        return "already saved";
    } 
    return "error exist";
}

And in your jsp,

success: function(data){
    alert(data);
}

edited Oct 5, 2015 at 11:18

Luffy

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answered Nov 7, 2014 at 6:25

Santhosh

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2 Comments

Sujan Over a year ago

But I need to return view from that method because without that, spring will not be able to load the jsp.

Santhosh Over a year ago

@najus No the concept of ajax is to refresh the part of the page so it is enough to the send the return value alone . As you are loading the same page

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