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Editorial Team
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Asked: 2026-06-18T07:49:34+00:00

I have the following (note that I am using the spring convention by prefixing

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I have the following (note that I am using the spring convention by prefixing with underscore):

<input type="checkbox" name="speakersIds[${speaker.id}]"  value="true"  />
<input type="hidden"   name="_speakersIds[${speaker.id}]" value="false" />

speakersIds is a map property of my model.

Map<Long, Boolean> speakersIds;

The problem is that in my controller, unchecked checkbox are not set to false.

Example:

if speakersIds[0] was checked, then speakersIds.get(0) == true

if speakersIds[0] was not checked, then speakersIds.get(0) == null. <— shouldn’t this be == false?

Why?

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1 Answer

  1. Editorial Team

    In case of map, the underscore convention do not seem to work.

    I finally just used the same property name in the hidden input.

    <input type="checkbox" name='speakersIds["${speaker.id}"]'  value="True" />
    <input type="hidden"   name='speakersIds["${speaker.id}"]'  value="False" />

    While testing I had to change the type of speakersIds from Map<Long, Boolean> to Map<String, Boolean> but it should work with long as map key too.

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