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nits Not able to work on data types..
1) var oc= '{!TestScreen__c.Occupancy__c}';
alert(oc);
alert(oc);
2) var oc= {!TestScreen__c.Occupancy__c};
alert(oc);
alert(oc);
Statement 2) gives error. I am not able to find the error.
ckempThe error is that, basically, stuff within the {! [...] } is replaced with values before the Javascript is run by your browser, more or less. So to your browser, #1 looks like "var oc = 'my substituted value';" (correct) and #2 looks like "var oc = my substituted value;" (incorrect, will generate an error.)
Quotes are missing in the #2.