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How to use 'javascript validation for blank text field' in JavaScript

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CoprHD/coprhd-controller
15function validateForRequired(obj){
16	var controlGroup = obj.parentNode.parentNode;
17	if(obj.value == "" || obj.value == null){
18		addValidationMessage(controlGroup, 'Required');
19	}else{
20		removeValidationMessage(controlGroup);
21	}
22}

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