Options in select : Option Select ComboBox « Form Control « JavaScript DHTML

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JavaScript DHTML » Form Control » Option Select ComboBox 
Options in select
function function1() {
    var col = document.all.colors.size;
    alert(col+" number of options"

<form method="post" action="">
<select id="colors" size="10">
    <option value="white" selected>White</option>
    <option value="cyan">Cyan</option>
    <option value="ivory">Ivory</option>
    <option value="blue">Blue</option>
    <option value="red">Red</option>
    <option value="lightblue">Lightblue</option>
    <option value="beige">Beige</option>
<input type="button" value="Number of options" onclick="function1();">

Related examples in the same category
1.Set select to multiple selected
2.Option label
3.Option default Selected Example
4.Option selected Index Example
5.Option selected
6.Is Select a select-multiple
7.'index' Example
8.'value' Example
9.Add an option to select
10.'text' Example
11.Option selected index
12.Auto Linked Option Listbox without button
13.Triggering a Value Change from a Pop-Up Menu
14.Cycling through a Multiple-Selection List
15.Modifying optgroup Element Labels
16.Grouped selection control on change event
17.Change background
18.Changing Select Element Content (two Combobox)
19.Drop-down Redirect - No Submit button
20.Drop-down Redirect - Submit
21.Dropdown list (combobox) in a form
22.dropdown list (combobox) in form 2
23.Disable or enable an option
24.Disable and enable a dropdown list (combobox)
25.Return the name of the form that contains dropdown list (combobox)
26.Number of options in the dropdown list(Combobox)
27.Change the size of a dropdown list (ComboBox)
28.Select multiple options in a dropdown list (option)
29.Return the selected option as text in option
30.Return the selected option as a number
31.Change the option text
32.Remove an option from a dropdown list (combobox)
33.Methods and Properties of the Select Object
34.Properties of the Option Object
35. Using the Location object to change another frame's URL
36.Using a Summary Form to Support Local Processing
37.Navigating with a SELECT Object
38.Using the selectedIndex Property
39. Modifying OPTGROUP Element Labels
40.Using the options[index].text Property
41. Using the options[index].value Property
42.Triggering a Color Change from a Pop-Up Menu
43.Modifying SELECT Options
44.Modifying SELECT Options (IE4+)
45.Modifying SELECT Options (NN6+)
46.Selecting an Option Using JavaScript
47.Linked ComboBox (option) Country =- province
48.ComboBox set value to TextField
49.Menu(Option) Generator
50.URL Option ComboBox
51.Show Selected Option items
52.Click button to navigate to selected url from form select control
53.Set the select control value
54.Add or remove options from select form control
55.Get changed selection from form select
56.Demonstrates select object used as a multi-line list box
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