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We are replacing ui names space tags with lightning name space tag in the lightning component since they are going to deprecating soon.

We are displaying multiple languages with checkbox’s . When users selects check box language value should update in backend. While using ui:inputCheckbox tag we are able to update the language but if we use lightning:input type="checkbox" language values updating as Boolean value (True) in the back end instead of check box values. Below is the peace of code.

<aura:attribute name="selectAllLanguages" type="Boolean" default="false" />
  <aura:attribute name="languages" type="Object[]" />
 <aura:iteration items="{!v.languages}" var="lang">
  <lightning:input type="checkbox"  value="{!lang.isSelected}" aura:id="boxPackLanguages" />
   <!--<ui:inputCheckbox text="{!lang.language}" value="{!lang.isSelected}" aura:id="boxPackLanguages" />--> 

</aura:iteration>

JS Code:

var languagesSelected = false;
var getAllLanguages = component.find("boxPackLanguages"); 
   if(getAllLanguages != null){
            //if there's only one language
            if (getAllLanguages[0] == null) {
                languagesSelected = true;
                languages.push(getAllLanguages.get("v.value"));
            }
            
            for (var i = 0; i < getAllLanguages.length; i++) {
                if (getAllLanguages[i].get("v.value") == true) {
                    languagesSelected = true;
                    languages.push(getAllLanguages[i].get("v.value"));
                }
            }
        }   
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Lightning Checkboxes use the attribute checked, which is consistent with the HTML specification, rather than the ui:inputCheckbox, which called it value. You'll need to set the checked attribute to set the value, and read this value to determine if the box is checked.

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You might consider using lightning:checkboxGroup instead. You can see the documentation at https://developer.salesforce.com/docs/component-library/bundle/lightning:checkboxGroup/example along with controller example to get values.

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