Pass selected checkboxes to controller and perform insert operation

Question

I have a Visualforce page with a page block section which contains multiple rows from different object (Result from query in controller from custom object called "Location__c"). I need to pass the id's of selected rows to controller and perform insert operation to be stored in another custom object called "Desiredlocation__c" with the id's that i received, "Desireclocation__c" is parenting to custom object called "TLead__c". Can anyone help?

My VF

<apex:page docType="html-5.0" controller="incDesiredLocationsController">
<apex:pageMessages />
<apex:form >
    <apex:pageBlock title="New Desired Location">
    <div align="center">   
    <apex:commandButton value="Save" action="{!save}"/>
    </div>     
    <apex:pageblockSection title="Select Location" columns="1">      
            <apex:selectCheckboxes value="{!locationIds}" layout="PageDirection">
                <apex:selectOptions value="{!locationSelect}"/>
            </apex:selectCheckboxes><br/>
    </apex:pageblockSection>         
      </apex:pageBlock>
</apex:form>

My controller

public class incDesiredLocationsController {

//add multiple desired location

public List<SelectOption> getlocationSelect(){

List<SelectOption> locationSelect = new List<SelectOption>();
locationIds = new List<Id>();

List<Location__c> dloc = [SELECT City__c,Id, Region__c FROM Location__c where Country__c = 'ID' ORDER BY City__c asc];

for(Location__c loc:dloc)
    locationSelect.add(new SelectOption(loc.Id, loc.City__c));  

return locationSelect;

}

String[] locationIds = new String[]{};
public String[] getlocationIds () {
    return locationIds;
}

public void setlocationIds(String[] locationIds) {
    this.locationIds = locationIds;
}

public PageReference save(){
         //code block here
}

}

Answer 1

Remove desiredLocationList and implement below method:

--edited--

public List<SelectOption> getlocationSelect(){

    List<SelectOption> locationSelect = new List<SelectOption>();

    List<Location__c> dloc = [SELECT City__c,Id Region__c FROM Location__c where Country__c = 'ID' ORDER BY City__c asc];

    for(Location__c loc:dloc)
        locationSelect.add(new SelectOption(loc.City__c, loc.City__c));  

    return locationSelect;
}

and remove public List<SelectOption> locationSelect {get; set;}.

Now, implement below getter and setter:

String[] locationIds = new String[]{};
public String[] getlocationIds () {
    return locationIds;
}

public void setlocationIds(String[] locationIds) {
    this.locationIds = locationIds;
}

and remove public List<Id> locationIds{get; set;}. Above setter (set method) will automatically get the selected location ids.

Now,

public PageReference save(){
    System.debug('locationIds => '+locationIds);
    /*
    if(tleadName == null || tleadName == ''){
        ApexPages.addmessage(new ApexPages.message(ApexPages.severity.WARNING,'T Lead is Required!'));
    }else{
        Location__c loc1 = new Location__c();
        loc1.Name = tleadName1;
        loc1.Id = tleadId1;
        insert loc1;
    }*/
    return null;
}

Here System.debug('locationIds => '+locationIds); will print the selected location ids in log. You can process locationIds further.