JavaScript Javascript Get Option from Dropdownlist based off the Value javascript option from array,javascript option from select,javascript option

Here, this will get selected.

Added a text change for demo.

NOTE: I removed the __doPostBack in the onChange because it does not exist in the snippet.

function CheckValueSelected() {
  let sel = document.querySelector('#DropDownOutfall');
  let opt = sel.options[sel.selectedIndex];
  opt.text += 'Test Change';
  console.log(opt);
}
<select name="ctl00$MainContent$DropDownOutfall" onchange="CheckValueSelected();" id="DropDownOutfall" class="form-control" style="">
    <option selected="selected" value="-1"></option>
    <option value="OUTFALL 001">OUTFALL 001</option>
    <option value="OUTFALL 002">OUTFALL 002</option>
    <option value="OUTFALL 004">OUTFALL 004</option>
    <option value="OUTFALL 005">OUTFALL 005</option>
</select>
Answer:1

First, simply use the id: $('#DropDownOutfall') to lookup the <select> element.

Then, to get the selected option, use .find() and apply .html() (or .text()) on it.

$('#DropDownOutfall').on('change',function(){
  $(this).find('option:selected').html('Hello world');
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<select name="ctl00$MainContent$DropDownOutfall" id="DropDownOutfall" class="form-control" style="">
    <option selected="selected" value="-1"></option>
    <option value="OUTFALL 001">OUTFALL 001</option>
    <option value="OUTFALL 002">OUTFALL 002</option>
    <option value="OUTFALL 004">OUTFALL 004</option>
    <option value="OUTFALL 005">OUTFALL 005</option>
</select>
Answer:2
$('#DropDownOutfall').change(function() {
    var selectedValue = $('#DropDownOutfall').val();
    var selectedOption = $('#DropDownOutfall option[value="' + selectedValue + '"]');
    selectedOption.val("option value");//Changes actual value
    selectedOption.html("option value");//Changes value text
});
Answer:3

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