HTML | DOM Select Object - GeeksforGeeks

13 Feb, 2019
The Select object in HTML DOM is used to represent an HTML <select> element. The <select> element can be created by using the document.createElement() method and it can be accessed using the getElementById().
Syntax:
It is used to create <select> element.document.createElement("SELECT")
document.createElement("SELECT")
It is used to access <select> element.document.getElementById("mySelect")
document.getElementById("mySelect")
Select Object Properties:
autofocus: It is used to set or return the drop-down list automatically get focused when the page loads.
disabled: It is used to set or return whether the drop-down list is disabled, or not.
form: It returns the reference to the form that contains the drop-down list.
length:It returns the number of <option> elements in a drop-down list.
multiple: It is used to set or return whether more than one option can be selected from the drop-down list.
name: It is used to set or return the value of the name attribute of a drop-down list.
selectedIndex: It is used to set or return the index of selected option in a drop-down list.
size: It is used to set or return the value of the size of a drop-down list.
type: It returns the type of form element a drop-down list.
value:It is used to set or return the value of selected option in a drop-down list.
Select Object Methods:
add(): It is used to add an option to a drop-down list.
checkValidity(): It is used to check the validity of a drop-down list.
remove(): It is used to remove an option from a drop-down list.
Select Object Collections:
options: It returns the collection of all the options in a drop-down list.
Below programs illustrate the Select Object in HTML DOM:
Example 1: This example create the <select> element by using document.createElement() method.
<!DOCTYPE html><html>      <head>     <title>        HTML DOM Select Object    </title> </head>  <body>    <h1>GeeksforGeeks</h1>           <h2>HTML DOM Select Object</h2>           <p>        Click on button to create select        and option element    </p>          <button onclick = "myGeeks()">        Create Select Element    </button>          <!-- script to create select element -->    <script>        function myGeeks() {            var sel = document.createElement("Select");            sel.setAttribute("id", "MySelect");            document.body.appendChild(sel);                          var opt = document.createElement("option");            opt.setAttribute("value", "gfg");            var nod = document.createTextNode("gfg");            opt.appendChild(nod);            document.getElementById("MySelect").appendChild(opt);        }          </script></body>  </html>                                                           
Output:Before Click on the button:After click on the button:
Example 2: This example access the <select> element by using getElementById() method.
<!DOCTYPE html><html>      <head>     <title>        HTML DOM Select Object    </title> </head>  <body>      <h1>GeeksforGeeks</h1>           <h2>HTML DOM Select Object</h2>           <select id="GFG">        <option>Fork Python</option>        <option>Fork Java</option>        <option>Fork CPP</option>        <option>Sudo Placement</option>    </select>          <p>        Click on button to get the number        of option elements    </p>          <button onclick = "myGeeks()">        Create Select Element    </button>          <p id="test"></p>          <!-- script to count select element -->    <script>        function myGeeks() {            var len = document.getElementById("GFG").length;            document.getElementById("test").innerHTML = len;        }    </script></body>  </html>                                                            
Output:Before Click on the button:After click on the button:
Supported Browsers: The browser supported by DOM Select Object are listed below:
Opera
Internet Explorer
Google Chrome
Firefox
Apple Safari
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