jQuery Set Select Index

Answer 1

# Set element with index
$("#select option:eq(2)").attr("selected", "selected");

# Set element by text
$("#select").val("option Text").attr("selected", "selected");

when you want to select with top ways for set selection , you can use
$('#select option').removeAttr('selected'); for remove previous selects .

# Set element by value
$("#select").val("2");

# Get selected text
$("#select").children("option:selected").text();  # use attr() for get attributes
$("#select option:selected").text(); # use attr() for get attributes 

# Get selected value
$("#select option:selected").val();
$("#select").children("option:selected").val();
$("#select option:selected").prevAll().size();
$("option:selected",this).val();

# Get selected index
$("#select option:selected").index();
$("#select option").index($("#select option:selected"));

# Select First Option
$("#select option:first");

# Select Last Item
$("#select option:last").remove();


# Replace item with new one
$("#select option:eq(1)").replaceWith("new option");

# Remove an item
$("#select option:eq(0)").remove();