HTML DOM Textarea defaultValue property
Textarea object Definition and Usage
defaultValue property sets or returns the initial contents of the text box.
Note: The initial value of the text is a text box located <textarea> and </ textarea> tags.When the form is reset, the text box will be restored to the entire value. Text change the value of the property will change the text box currently displayed.
grammar
Setting defaultValue property:
textareaObject.defaultValue="text"
Back defaultValue attributes:
textareaObject.defaultValue
Tip: defaultValue property has no default value.
| 值 | 描述 |
|---|---|
| text | 指定文本框的默认值 |
Browser Support
All major browsers support defaultValue property
Examples
Examples
The following examples suggest the default value of the text box:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>本教程(w3big.com)</title>
<script>
function displayResult()
{
alert(document.getElementById("myTextarea").defaultValue);
}
</script>
</head>
<body>
<textarea id="myTextarea" cols="20">
在本教程，你可以学多很多编程的基础知识，包括 HTML, XML, SQL, ASP, 和 PHP 等各种前端内容。
</textarea>
<br>
<button type="button" onclick="displayResult()">弹出默认值</button>
</body>
</html>
<html>
<head>
<meta charset="utf-8">
<title>本教程(w3big.com)</title>
<script>
function displayResult()
{
alert(document.getElementById("myTextarea").defaultValue);
}
</script>
</head>
<body>
<textarea id="myTextarea" cols="20">
在本教程，你可以学多很多编程的基础知识，包括 HTML, XML, SQL, ASP, 和 PHP 等各种前端内容。
</textarea>
<br>
<button type="button" onclick="displayResult()">弹出默认值</button>
</body>
</html>
Textarea object