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Using JQuery:
Sometimes, I can do variable.val() and it works. Sometimes, I’m required to use $(variable).val().
I want to be able to make the choice without trial-and-error.
Does anyone know when to wrap an object with $() while using JQuery?
Wrapping a DOM object with $() will convert it to a jQuery Wrapped Set Element. This way you should be able to call jQuery methods with it (val(), attr(), show(), hide(), serialize()).
If however you need to get or set pure javascript properties, then you shouldn’t wrap it.