Include single quotation mark in string

Question

I'm trying to add a single quote to the following code

if(txo.Target__c != null){
                       targetsToCreate.add(txo);
                   }else{
                       o.addError(' Please ask your Salesforce Administrator to add a target record, for the month & year of your Opportunity's close date');
                   }

so that my string is displayed as

Please ask your Salesforce Administrator to add a target record, for the month & year of your Opportunity's close date.

The above causes the error

line breaks not allowed in string literals

Having found various 'solutions', I've tried Opportunity''s, Opportunity\\\\'s, Opportunity\'\'s and

" Please ask your Salesforce Administrator to add a target record, for the month & year of your Opportunity's close date"

but none of the above work.

How can I include the single quotation mark in my string?

Answer 1

This way it works:

trigger SingleQuote on Account (after insert) {
   Trigger.New[0].addError(' Please ask your Salesforce Administrator to add a target record, for the month & year of your Opportunity\'s close date');
}

AND

AND

Answer 2

You can try using html-entity for the single quotation mark:

if(txo.Target__c != null){
    targetsToCreate.add(txo);
}else{
    o.addError(' Please ask your Salesforce Administrator to add a target record, for the month & year of your Opportunity's close date', FALSE);
}

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Edit #1 Ofcourse, don't forget to set pageMessages component's escape attribute to false (as I forgot to mention it):

<apex:pageMessages escape="false" />

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Edit 2 Sorry, being in a rush I didn't notice that it's not a VF page you're having problems with, but rather a standard page. In any case, just use the false as the second argument in the addError(sObj, boolean) call, as the second parameter "Indicates whether any HTML markup in the custom error message should be escaped (true) or not (false)."