[SalesForce] Conditional custom button on page direct to URL if condition = true, display message if false

I have a custom button on a custom object page from which I generate a VisualForce PDF document (Content Source = URL). There are conditions, however, where the PDF should not be generated based on the value of a field in the object.

I would like to build an IF condition on the button to open the PDF page if the value of the field is correct, but if not, to stay on the current page and display a message.

Salesforce discourages use of Javascript for buttons so I'm trying to find a different way, so if anyone can help I'd appreciate it. I've found articles but none showing how to do the 'else' condition I need.

{!if(ISPICKVAL (myObj__c.FieldA__c,"TypeA"),
     URLFOR("/apex/myPDF?myId="&myObj__c.Id),
     ....stay on page and display message.....}

I'd like to dispay a message on the current page to the effect of 'Sorry, you cannot generate a PDF for this item'.

The 'true' part of the IF works fine.

Best Answer

<apex:page standardController="MyObj__c" action="{!IF(ISPICKVAL (MyObj__c.FieldA__c,'TypeA'),
                            URLFOR(...),
                            NULL)}"/>
    <apex:pageMessage severity="warning" summary="Sorry, you can not ..."/>
</apex:page>

You can use the page action attribute and return NULL to stay on the page. The custom button references the VF page so you don't have to use any JS

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[SalesForce] Error Message Display from Custom VisualForce Button without JavaScript

Normally, I use to follow this approach. Create a CustomException class.

public class CustomException extends Exception {}

Controller

try
{
    if(acc.phone == '' || acc.phone == null)
    {
        throw new CustomException('Please enter Account phone');
    }
}
catch(Exception e)
{
    ApexPages.Message msg = new ApexPages.Message(ApexPages.Severity.Error, ex.getMessage());
    ApexPages.addMessage(msg);
}

Now, error messages can be handled in the Exception block and displayed to the visualforce page inside <apex:pageMessages id="showmsg"></apex:pageMessages>

[SalesForce] Custom Button Formula URL IF condition

Merge fields start with {! and end with }. You don't use them in the middle of a formula. To merge in the middle of the formula, you want to use the concatenation operator, &. However, doing it the way you are doing it might break on some inputs.

I'd avoid possible encoding errors by using URLFOR, instead. Symbols such as &, =, and %, can cause parameters to get screwed up/misinterpreted, etc.

{!IF(ISNULL(Submission__c.DPM_Project__c),
  URLFOR("https://url.aspx", null, 
    [PROJECTID=Lead.Name, LOCATIONId=Lead.Location__c,
     INNCODE=Lead.Inn_Code__c, BRANDCODE=Lead.Future_Brand__c]),
  URLFOR("https://url.aspx", null,
    [PROJECTID=Opportunity.Name, LOCATIONId=Opportunity.Location__c,
     INNCODE=Opportunity.Inn_Code__c, BRANDCODE=Opportunity.Brand_Items__c])
)}

(Note: I reversed the true/false values to avoid the unnecessary extra NOT function, but this is mostly just a matter of preference).

Best Answer

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[SalesForce] Error Message Display from Custom VisualForce Button without JavaScript

[SalesForce] Custom Button Formula URL IF condition

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