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Below codes are the top searchable jquery snippet code that may helpful for your needs.

JQuery code to check if object is visible.

	// using object ID
	var ifVisible = $("#objectID").is(":visible");

	// using className
	var ifVisible = $(".className").is(":visible");

JQuery code to check if checkbox is checked.

	//using object ID
	var ifTicked = $("#objectID").is(":checked");

	//another alternative
	var ifTicked = $("#objectID").prop("checked");

	//another alternative
	var ifTicked = $("#objectID").attr("checked");

	//Use each method to see how many checkboxes are checked
	//let assume the checkboxes located inside a div id #checklist
	$("#checklist input:checkbox").each(function(){
		if($(this).is(":checked")){
			//the item is ticked, do something here...
		}
	});

	//Use each method to set the all checkboxes ticked
	//let assume the checkboxes located inside a div id #checklist
	$("#checklist input:checkbox").each(function(){
		$(this).prop("checked", true);
	});

JQuery code to if object is exist.

We use length property in here to check if an element is exists. Note: if the object is found, it will return a value more than 0.

	// using object ID
	var ifExist = $("#objectID").length;

	// using className
	var ifExist = $(".className").length;

JQuery code to remove all select options.

	//assuming we have a selectbox with ID myselect
	$('#myselect').children().remove().end();

	//if you want to add initial value, you can use this one
	$('#myselect').children().remove().end().append('<option value="0">Select</option>');

JQuery code to remove select option by id value or by text.

	//remove option based on select id value.
	//assuming we have a selectbox with ID myselect and we want to remove value equal to 'apple'
	$("#myselect option[value='apple']").remove();

	//Remove the select option contains word 'bread':
	$("#myselect option:contains('bread')").remove();

JQuery code to add or remove css class.

	//assuming we have a div element with ID myDIV
	//we add class to myDiv object
	$("#myDiv").addClass("myCssClass");

	//Remove css class:
	$("#myDiv").removeClass("myCssClass");