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$(this).val(); //in jquery it returns the selected value
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$("select.your-select").change(function(){
$(this).children("option:selected").val();
});
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var selectedOptionText = $('#mySelectID').find(":selected").text();//selected option text
var selectedOptionVal = $('#mySelectID').find(":selected").val();//selected option value
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$(document).ready(function(){
$("select.country").change(function(){
var selectedCountry = $(this).children("option:selected").val();
alert("You have selected the country - " + selectedCountry);
});
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let payment_type = $("#olca_form_submit select[name='payment_type']")
.find(":selected")
.val();
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var conceptName = $('#aioConceptName').find(":selected").text();
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// Select an option by value
$('select').val('optionValue');
// Select an option by index
$('select option:eq(index)').prop('selected', true);
// Select the first option
$('select option:first').prop('selected', true);
// Select the last option
$('select option:last').prop('selected', true);