Sample Code:
Visualforce Code:
<apex:page controller="sample">
<apex:form >
<apex:pageMessages/>
<apex:pageBlock>
<apex:pageBlockSection columns="2">
<apex:pageblockSectionItem>
<apex:outputLabel value="Known City"/>
</apex:pageblockSectionItem>
<apex:pageblockSectionItem>
<apex:inputCheckbox value="{!knwCity}">
<apex:actionSupport event="onchange" reRender="a"/>
</apex:inputCheckbox>
</apex:pageblockSectionItem>
<apex:pageblockSectionItem>
<apex:outputLabel value="City"/>
</apex:pageblockSectionItem>
<apex:pageblockSectionItem>
<apex:inputText value="{!city}" required="{!bool}" id="a"/>
</apex:pageblockSectionItem>
<apex:commandButton value="Save" action="{!save}"/>
</apex:pageBlockSection>
</apex:pageBlock>
</apex:form>
</apex:page>
Apex Class:
public class sample
{
public String city {get;set;}
public Boolean knwCity {get;set;}
public Boolean bool {get;set;}
public void save()
{
bool = false;
if(knwCity == true)
{
bool = true;
ApexPages.addMessage(new ApexPages.Message(ApexPages.Severity.ERROR,'City is required when Known city is checked'));
}
}
public sample()
{
bool = false;
}
}
Visualforce Code:
<apex:page controller="sample">
<apex:form >
<apex:pageMessages/>
<apex:pageBlock>
<apex:pageBlockSection columns="2">
<apex:pageblockSectionItem>
<apex:outputLabel value="Known City"/>
</apex:pageblockSectionItem>
<apex:pageblockSectionItem>
<apex:inputCheckbox value="{!knwCity}">
<apex:actionSupport event="onchange" reRender="a"/>
</apex:inputCheckbox>
</apex:pageblockSectionItem>
<apex:pageblockSectionItem>
<apex:outputLabel value="City"/>
</apex:pageblockSectionItem>
<apex:pageblockSectionItem>
<apex:inputText value="{!city}" required="{!bool}" id="a"/>
</apex:pageblockSectionItem>
<apex:commandButton value="Save" action="{!save}"/>
</apex:pageBlockSection>
</apex:pageBlock>
</apex:form>
</apex:page>
Apex Class:
public class sample
{
public String city {get;set;}
public Boolean knwCity {get;set;}
public Boolean bool {get;set;}
public void save()
{
bool = false;
if(knwCity == true)
{
bool = true;
ApexPages.addMessage(new ApexPages.Message(ApexPages.Severity.ERROR,'City is required when Known city is checked'));
}
}
public sample()
{
bool = false;
}
}
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