How To Check If An Item Is Selected From An HTML Drop Down List?

I have a drop drown list and I am having trouble checking whether or not a value has been selected from the drop down list Below is my HTML Code : Copy

should be

if (card.value == "selectcard")

Here is complete code for that

function validate()
{
 var ddl = document.getElementById("cardtype");
 var selectedValue = ddl.options[ddl.selectedIndex].value;
    if (selectedValue == "selectcard")
   {
    alert("Please select a card type");
   }
}

JS Fiddle Demo

Solution 2:

<script>
var card = document.getElementById("cardtype");
if(card.selectedIndex == 0) {
     alert('select one answer');
}
else {
    var selectedText = card.options[card.selectedIndex].text;
    alert(selectedText);
}
</script>

Solution 3:

function check(selId) {
  var sel = document.getElementById(selId);
  var dropDown_sel = sel.options[sel.selectedIndex].text;
  if (dropDown_sel != "none") {

           state=1;

     //state is a Global variable initially it is set to 0
  } 
}


function checkstatevalue() {
      if (state==1) {
           return 1;
      } 
      return false;
    }

and html is for example

<form name="droptest" onSubmit="return checkstatevalue()">

<select id='Sel1' onchange='check("Sel1");'>
  <option value='junaid'>Junaid</option>
  <option value='none'>none</option>
  <option value='ali'>Ali</option>
</select>

</form>

Now when submitting a form first check what is the value of state if it is 0 it means that no item has been selected.

Solution 4:

You can check if the index of the selected value is 0 or -1 using the selectedIndex property.

In your case 0 is also not a valid index value because its the "placeholder":
<option value="selectcard">--- Please select ---</option>

LIVE DEMO

function Validate()
 {
   var combo = document.getElementById("cardtype");
   if(combo.selectedIndex <=0)
    {
      alert("Please Select Valid Value");
    }
 }

Solution 5:

<label class="paylabel" for="cardtype">Card Type:</label>
<select id="cardtype" name="cards">
<option value="selectcard">--- Please select ---</option>
<option value="mastercard" selected="selected">Mastercard</option>
<option value="maestro">Maestro</option>
<option value="solo">Solo (UK only)</option>
<option value="visaelectron">Visa Electron</option>
<option value="visadebit">Visa Debit</option>
</select><br />

<script>
    var card = document.getElementById("cardtype");
    if (card.options[card.selectedIndex].value == 'selectcard') {
          alert("Please select a card type");
          return false;
    }
</script>