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<select id="mySelect">
<option value="option1">Option 1</option>
<option value="option2">Option 2</option>
<option value="option3">Option 3</option>
</select>
<button onclick="getSelectedValue()">Get Selected Value</button>
<script>
function getSelectedValue() {
var selectElement = document.getElementById("mySelect");
var selectedValue = selectElement.value;
console.log(selectedValue);
}
</script>
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<select id="ddlViewBy">
<option value="1">test1</option>
<option value="2" selected="selected">test2</option>
<option value="3">test3</option>
</select>
<script>
var e = document.getElementById("ddlViewBy");
var strUser = e.value; // 2
var strUser = e.options[e.selectedIndex].text; //test2
</script>
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var yourSelect = document.getElementById( "your-select-id" );
alert( yourSelect.options[ yourSelect.selectedIndex ].value )
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<select id="mon-menu-deroulant">
<option value="option1">Option 1</option>
<option value="option2">Option 2</option>
<option value="option3">Option 3</option>
</select>
<script>
// Récupérer l'élément select
var selectElement = document.getElementById("mon-menu-deroulant");
// Récupérer la valeur de l'option sélectionnée
var selectedValue = selectElement.value;
</script>
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const selectedValue = document.getElementById("color-id").value;