How to take values of only selected checkbox in Action class in struts2 and jsp

Question

Here I am displaying 24 checkboxes.I want to get all the values of checked checkboxes in action class and insert it as a new record inside database.Inserting will be done on

Answer 1

The value attribute should not be empty value="". If you followed the linked answer you have seen that s:checkbox tag is used. When this tag is rendered it provided the field value for both checked and unchecked checkbox. And remarking Dave Newton's notice in his book "It should have values true or false the only viable values for the moment. These are only values that work correctly with checkbox interceptor."

The tag renders a single checkbox . At the time of this writing it only works well with Boolean (or boolean) properties. Attempting to preselect a checkbox with, for example, a string value only works if the string is true or false .

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There's an example Struts 2 checkbox example, which is using such fieldValue attribute.

If you want a deep incite into how checkbox interceptor is working you can read <s:checkbox> not auto populating in struts2 form.

Another example that is using multiple checkboxes Struts 2 multiple check boxes example. Unlike the s:checkbox it doesn't work with any unchecked values and you can map values directly using listKey and listValue attributes.

Answer 2

I just changed my datatype of variable from boolean to string[] . It will store the values of the checkbox selected. Below is my jsp.

<s:form action="resultAction" namespace="/">

        <h2>
            <input name="checkMe" type="checkbox"
                class="formcheckbox" value="Rangabhoomi"><span
                class="formcheckbox_content">Rangabhoomi</span> 
                <input
                name="checkMe" type="checkbox" class="formcheckbox"
                value="Fire Noc"><span class="formcheckbox_content">Fire NOC</span>

        </h2>

        <input type="submit" value="Submit" />

    </s:form>

Below is my action class

package com.checkboxInStruts2;

import com.opensymphony.xwork2.ActionSupport;

public class CheckboxAction extends ActionSupport 
{
    private String checkMe[];

    public CheckboxAction() {
        // TODO Auto-generated constructor stub
    }

    public String[] getCheckMe() {
        return checkMe;
    }

    public void setCheckMe(String[] checkMe) {
        this.checkMe = checkMe;
    }
    @Override
    public String execute() throws Exception {
        // TODO Auto-generated method stub
        for(int i=0;i<checkMe.length;i++)
        {
            System.out.println(checkMe[i]);
        }

        return "success";
            }


}

and for display use below tag on jsp.It will display the array of string values of selected checkboxes.

<s:property value="checkMe"/>