Get value from select list in JS

问题

I know that this might be very simple question and I tried to find solutions in the web but I can't figure it... I have the following C# / ASPX code:

    SelectArea += "<select name=\"Area\" id=\"area\">" + "<option value=\"Default\" style=\"display:none;\">SELECT AREA</option>";
    for (i = 0; i < ds.Tables[0].Rows.Count; i++)
    {
        AreaName = ds.Tables[0].Rows[i]["AreaName"].ToString();
        SelectArea += string.Format("<option value=\"{0}\"/>{0}</option>", AreaName);
    }
    SelectArea += "</select>";

And this javascript function that happeen after submit

function validateProfile() {

    var el = document.getElementById("area").value;
    alert(el);
}

I want some how to get the number of the selected value in the list. I tried with the code above but it doesn't work.

wish for help, thanks!

回答1:

For example if you have

  <select id="myselect">
      <option value="1">value1</option>
      <option value="2" selected="selected">value2</option>
      <option value="3">value3</option>
  </select>

To get selected option do:

  var selects = document.getElementById("myselect");
  var selectedValue = selects.options[selects.selectedIndex].value;// will gives u 2
  var selectedText = selects.options[selects.selectedIndex].text;// gives u value2

Sample JsFiddle

回答2:

Try with this

var el = document.getElementById("area");
var selectedArea = el.options[el.selectedIndex].value;

回答3:

Try :

var myList = document.getElementById("area");
var selectedValue = myList.options[myList.selectedIndex].value;
var selectedText = myList.options[myList.selectedIndex].text;

来源：https://stackoverflow.com/questions/16719412/get-value-from-select-list-in-js

标签

javascript

ASP.NET

select

getelementbyid