Spring. Binding checkboxes to ModelAttribute

Question

Unable to bind checkboxes to @ModelAttribute.

HTML:

<form method="post">
    <p><input type="checkbox" name="list" value="v1" /></p>
    <p><input type="checkbox" name="list" value="v2" /></p>
    <p><input type="checkbox" name="list" value="v3" /></p>
    <p><input type="checkbox" name="list" value="v4" /></p>
    <p><input type="submit" value="Send" /></p>
</form>

Java:

@RequestMapping(value = "/", method = RequestMethod.POST)
public String index(@ModelAttribute("list")List<String> list, ModelMap model)
{
    LoggerFactory.getLogger(this.getClass()).debug("list: " + list.size() + " " + list);
    ...
}

Checked v2 and v3. In "index" first value only:

list: 1 [v2]

If I create form with spring tag:

<form:form modelAttribute="testForm">
    <p><form:checkbox path="list" value="v1" /></p>
    <p><form:checkbox path="list" value="v2" /></p>
    <p><form:checkbox path="list" value="v3" /></p>
    <p><form:checkbox path="list" value="v4" /></p>
    <p><input type="submit" value="Отправить" /></p>
</form:form>

TestForm.java:

public class TestForm
{
    private String[] list;

    public String[] getList()
    {
        return list;
    }

    public void setList(String[] list)
    {
        this.list = list;
    }
}

Everything is ok!

How to bind checkbox to @ModelAttribute without spring tag?

Also, I try <form method="post"> <p><input type="checkbox" name="list" value="v1" /><input type="hidden" name="_list" value="on" /></p> <p><input type="checkbox" name="list" value="v2" /><input type="hidden" name="_list" value="on" /></p> <p><input type="checkbox" name="list" value="v3" /><input type="hidden" name="_list" value="on" /></p> <p><input type="checkbox" name="list" value="v4" /><input type="hidden" name="_list" value="on" /></p> <p><input type="submit" value="Send" /></p> </form> — Alexander
– Alexander, Commented Jan 27, 2012 at 9:53

alephx · Accepted Answer · 2012-01-27 10:01:48Z

2

Check : public String index(@RequestParam("list") List<String> list, ModelMap model)

answered Jan 27, 2012 at 10:01

alephx

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Comments

Selona · Accepted Answer · 2020-04-14 06:45:07Z

0

Change below sources..

TestForm.java:

public class TestForm
{
    private List<String> list;

    public List<String> getList()
    {
        return list;
    }

    public void setList(List<String> list)
    {
        this.list = list;
    }

    public void setList(String list)
    {
        this.list.add(list);
    }
}

Java:

@RequestMapping(value = "/", method = RequestMethod.POST)
public String index(@ModelAttribute TestForm list)
{
    ...
}

edited Apr 14, 2020 at 6:45

answered Apr 11, 2020 at 3:46

Selona

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2 Comments

davidgiga1993 Over a year ago

Please provide an explanation why this resolves the issue.

Selona Over a year ago

If you declare public void setList(Stirng list) this.list.add(list); in TestForm @ModelAttribute can get checkbox values at the list one by one.

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