[SalesForce] String null value check concatenate string

I am using below code to check string null or blank value and then concatenating field but this is not working – Can you please help..

 string result = abc__c.field1__c!=NULL ? abc__c.field1__c:''+  abc__c.field2__c != NULL ? abc__c.field2__c : '' +abc__c.field3__c != NULL ? abc__c.field3__c : '';

Best Answer

You need to use parentheses to make sure that the logic is parsed correctly:

string result = (abc__c.field1__c != NULL ? abc__c.field1__c : '')+
                (abc__c.field2__c != NULL ? abc__c.field2__c : '')+
                (abc__c.field3__c != NULL ? abc__c.field3__c : '');

The reason why is that the ternary operator is right associative, and + has a higher precedence than assignments (including ternary operators), so the default operation without parentheses looks like this:

string result = abc__c.field1__c != NULL ? abc__c.field1__c : (''+
                abc__c.field2__c != NULL ? abc__c.field2__c : (''+
                (abc__c.field3__c != NULL ? abc__c.field3__c : '')));

Which is not the intended effect.

Related Solutions

[SalesForce] Apex param is giving NULL value

There's a quirk with <apex:actionFunction> in that it won't pass any parameters (i.e. the actual generated javascript function takes no parameters) unless you include a rerender attribute. That can be blank, so this might do the trick:

<apex:actionFunction action="{!saveResponsible}" name="echo" rerender="">

That said, I've rarely had luck using assignTo and tend to fall back on retrieving the parameters directly in code, for example:

String firstParam = ApexPages.CurrentPage().GetParameters().Get('firstParam');

[SalesForce] Null check for Date field on VF Page

You can easily do this. Just use the render condition and display two OutputText. Based on the date field it will display output.

 <apex:outputText label="Date:" value="{0, date,  MM/ dd/ yyyy}" style="text-align:center;" rendered="{!care.Completion_Date__c != null}"> 
    apex:param value="{!care.Completion_Date__c}"/>  </apex:outputText>
<apex:outputText label="Date:" value="Value is null" style="text-align:center;" rendered="{!care.Completion_Date__c == null}"/>

Or you can also use VF function to check null validation

<apex:outputText label="Date:" value="{0, date,  MM/ dd/ yyyy}" style="text-align:center;" rendered="{!NOT(ISBLANK(care.Completion_Date__c))}">
    apex:param value="{!care.Completion_Date__c}"/>  </apex:outputText>
<apex:outputText label="Date:" value="Value is null" style="text-align:center;" rendered="{!ISBLANK(care.Completion_Date__c == null)}"/>

Best Answer

Related Solutions

[SalesForce] Apex param is giving NULL value

[SalesForce] Null check for Date field on VF Page

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