CODEWITHSUNDEEP
springformsspring-mvc
Ryan
Ryan

Reputation: 989

Spring MVC <form:xxx> tags

I have a doubt that in our web applications generally we are using spring MVC and for view purpose Spring MVC tags, So while writing Spring MVC tags we are using <form:xxx> tags like <form:input> <form:option> <form:select> also <form:label> like this. My confusion is that generally in HTML we are using all these above tags without including <form:xxx> so what is the exact difference in between both the tags and why <form:xxx> tag is needed when it comes to Spring MVC. Is there any object associates to it or what?

Upvotes: 2

Views: 414

Answers (1)

Md Zahid Raza
Md Zahid Raza

Reputation: 971

If you want to bind the user values collected using form to Object, Then you will need to use Spring form tag. For example..

<form:form action="actionUrl" method="post" modelAttribute="loginForm">
    <form:input path="empId" placeholder="Enter Employee Id"/>
    <form:errors path="empId" cssClass="error"/>
    <form:password path="password" placeholder="********"/>
    <form:errors path="password" cssClass="error"/>
    <input type="submit" value="Login"/>
</form:form>

Here modelAttribute="loginForm" , loginForm is a Object of Java Class with two fields empId and password.

public class LoginForm{
    private Integer empId;
    private String password;

    //getters and setters
}

So, Now when you submit the Login form, the values are automatically bound to java object which you can access in your controller method. Like 

@RequestMapping(value = {"/login"},method = RequestMethod.POST)
   public String authLogin(@Valid LoginForm loginForm,BindingResult result,ModelMap model){
      //Your code logic
   }

So, spring form binds form values automatically to java object and saves from accessing each request parameter manually. These values can also be validated using validation framework.

Upvotes: 1

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