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The selectedIndex property returns the index of the currently selected element in the dropdown list. This index starts from 0 and returns -1 if no option is selected. The options property returns the collection of all the option elements in the <select> dropdown list.

To show all the options from a dropdown list, use the options property. The property allows you to get all the options with length property.

The following script is getting the value of the selected option and putting it in text box 1 <script> function run() { document. ... The following script is getting a value from a text box 2 and alerting with its value <script> function up() { //if (document.getElementById("srt").value != "") { var dop = document.

The DropDownList component can be used inside an EditForm to create a form that includes a list for selecting an option. The EditForm component validates all data annotation rules using the DataAnnotationsValidator component.

Var getValue = document. getElementById('ddlViewBy'). selectedOptions0. value; alert (getValue); // This will output the value selected.

Have an option with value 0 which is going to be the default option of the dropdown and add required attribute to the select element. Once this select element is in a form and is submitted ,HTML is automatically going to take over the validation part.

Use the jQuery :selected Selector You can use the jQuery :selected selector in combination with the val() method to find the selected option value in a select box or dropdown list.

With JQuery:If you want to get the selected option text, you can use $(select element). text() . var text = $('#aioConceptName option:selected'). text();If you want to get selected option value, you can use $(select element). val() . var val = $('#aioConceptName option:selected').val();

Select selectedIndex PropertySelect the <option> element with index "2": getElementById("mySelect"). selectedIndex = "2";Deselect all options: getElementById("mySelect"). selectedIndex = "-1";The selectedIndex property will return "-1" if no options are selected: getElementById("mySelect"). selectedIndex;

Var getValue = document. getElementById('ddlViewBy'). selectedOptions0. value; alert (getValue); // This will output the value selected.