HTML DOM Select size property
Select Objects Definition and Usage
size property sets or returns the drop-down list a number of display options.
grammar
Set size properties:
selectObject.size=integer
Returns size properties:
selectObject.size
Browser Support
All major browsers support attribute size
Examples
Examples
Changing the number of visible down the list of options:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>本教程(w3big.com)</title>
<script>
function displayResult(){
document.getElementById("mySelect").size=4;
}
</script>
</head>
<body>
<form>
<select id="mySelect">
<option>Apple</option>
<option>Pear</option>
<option>Banana</option>
<option>Orange</option>
</select>
</form>
<button type="button" onclick="displayResult()">修改大小</button>
</body>
</html>
<html>
<head>
<meta charset="utf-8">
<title>本教程(w3big.com)</title>
<script>
function displayResult(){
document.getElementById("mySelect").size=4;
}
</script>
</head>
<body>
<form>
<select id="mySelect">
<option>Apple</option>
<option>Pear</option>
<option>Banana</option>
<option>Orange</option>
</select>
</form>
<button type="button" onclick="displayResult()">修改大小</button>
</body>
</html>
try it"
Select Objects