Pass a request parameter in Spring MVC 3

Question

I just want to send the value of my dropdownlist with a requestparameter. In my case being

Kidscalcula_web/start.htm?klasid=myValueHere

I know a way of doing this but it sounds so irrational to use it for this. If I was bored I'd probably write some jQuery to do a post and send the parameter for instance.Now it really sounds like a very bad idea to manually make my requeststring, since Spring takes care of that. So how could I make a simple form that just sends my dropdownvalue to my controller?

It's just that I can't find something so trivial anywhere, and one of you can probably help me out quickly.I suppose the controller would be just as trivial as:

    @RequestMapping(value = "post")
    public String postIndex(@RequestParam("klasid") String klasid, HttpServletResponse response,
            HttpServletRequest request) {
}

But I really can't find any examples on how to make a JSP to send me that value. Is this possible with the <form>taglib ?

Tomasz Nurkiewicz · Accepted Answer · 2012-01-10 18:13:12Z

12

The <form> taglib is generally used with form-backing command objects, rather than being bound to the controllers using individual @RequestParam arguments. This is why you won't see any documentation examples of that combination being used together.

For example, rather than having @RequestParam("klasid"), you'd have a command class with a field called klasid, and Spring would bind the whole lot together:

@RequestMapping(value = "post")
public String postIndex(@ModelAttribute MyCommandClass command) { /../ }

This makes sense when you consider that forms typically have multiple parameters, and it'd get cumbersome to declare them all using @RequestParam.

Having said that, you can still do it - any form controls will generate request parameters that @RequestParam can bind to, but if you choose to deviate from Spring MVC's form-backing command pattern, then it's quite awkward.

edited Jan 10, 2012 at 18:13

Tomasz Nurkiewicz

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answered Nov 9, 2010 at 22:58

skaffman

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2 Comments

toomuchcs Over a year ago

Before our application starts, we need to ask our user to make a choice that is being held in a cookie; but it does sound like total overkill to put one value in a command class. That is why I was wondering if nothing else could be used.

user4850722 Over a year ago

Should parameters be passed in "{ /../} " ??

axtavt · Accepted Answer · 2010-11-09 22:58:47Z

4

You don't even need a taglib to send this request. You can create a simpliest HTML form with method = "GET" (what is the default value of method):

<form action = "...">
    <select name = "klasid">
        <option value = "value1">Option 1</option>
        <option value = "value2">Option 2</option>
        <option value = "value3">Option 3</option>
    </select>
    <input type = "submit" />
</form>

answered Nov 9, 2010 at 22:58

axtavt

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