Checkbox.checked

Checkbox.checked : CheckBox : Form JAVASCRIPT TUTORIALS

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Syntax



document.form.checkbox.checked

The checked property holds the current state of a check box.

Because this property is a read/write Boolean, the state of the check box can be altered by changing this property.



<html>
    <form name="orderForm">
      <input type="checkbox" name="door4">4 doors<br>
      <input type="checkbox" name="door2">2 doors<hr>
      Step 2:
      <input type="button" value="Submit Order" name="orderButton" onClick="submitOrder()">
    </form>
    <script language="JavaScript">
    <!--
    function submitOrder() {
      if((document.orderForm.door4.checked == true) && (document.orderForm.door2.checked == true)){
        alert("You selected two different door styles. Reselect door style.");
        document.orderForm.door4.checked = false;
        document.orderForm.door2.checked = false;

      }else if((document.orderForm.door4.checked == false) && (document.orderForm.door2.checked == false)){
        alert("You did not select a door style! Please select a door style.");
      } else  {
        var alertString = String("Order: ");
        if(document.orderForm.door4.checked == true)
          alertString += "4 doors.";       
        if(document.orderForm.door2.checked == true)
          alertString += "2 doors.";       
        alert(alertString);
      }
    }
    -->
    </script>
    </html>