In spring mvc how do I get a javascript var as parameter in a java function?

Question

I'm working on a jsp page and I need a Javascript variable as parameter inside a java function e.g.:

<script>
    function example(string){
        <% javaFunction(string); %>
    }
</script>

how can I pass the javascript String variable to the java fucntion?

possible duplicate stackoverflow.com/questions/5701031/…

shreyansh jogi
– shreyansh jogi

2016-10-27 11:12:37 +00:00
Commented Oct 27, 2016 at 11:12 — shreyansh jogi
– shreyansh jogi, Commented Oct 27, 2016 at 11:12

halfer · Accepted Answer · 2025-04-24 20:26:10Z

2

DON'T USE SCRIPTLETS IN JSP!

You must understand JSP (views) code is executed in client side, Java one is at server (host) one.

In order to get variables from the host side, you have plenty of ways, but for small things best option is to make an ajax call:

$.get( "javaFunction", 
   { variable: "VALUE" } 
).done(function( data ) {
   alert("Java function returned " + msg);
});

In Java you need to map the url:

@RequestMapping(value = "/javaFunction", method = RequestMethod.POST)
public
@ResponseBody
String javaMethod(@RequestParam("variable") String variable) {

    if (variable.equals("VALUE") {
        return "Correct call!";
    } else {
        return "Mistake!";
    }
}

edited Apr 24 at 20:26

halfer

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answered Oct 27, 2016 at 11:25

Jordi Castilla

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3 Comments

Y Zwen Over a year ago

Thank you for your reaction, when I try this method I get an error in my console. It says it cannot find the javaFunction in the directory where the jsp is in. I'm very new to Spring so I really appreciate the help here. errormessage:"POST localhost:8080/pages/javaFunction 404 (Not Found)"

Jordi Castilla Over a year ago

uhm... I think it was my mistake, I copied ajax call with url what is not correct in this case, kindly check my update and let me know how it works

Y Zwen Over a year ago

I still get the 404 error when I try this; "GET localhost:8080/pages/javaFunction?variable=VALUE 404 Not Found"

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