JavaScript Window method: prompt()
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The prompt() method (when applied to Window
objects in the JavaScript
BOM) displays text in
a dialog box prompting user for input (and with an OK and Cancel button).
It
has the following syntax with the following parameters. It returns a string
if the user clicks OK, being the input value (an empty string if the user
didn’t input anything), or null
if the user clicks cancel.
window.prompt(text, defaulttext)
|
Parameter
|
Required / Optional
|
Description
|
|
text
|
Required
|
String specifying text
to display in dialog box
|
|
defaulttext
|
Optional
|
String specifying
default input text
|
EXAMPLE:
HTML USED IN THIS EXAMPLE:
<!DOCTYPE html>
<html> <!-- Copyright (c) Nematrian Limited 2018 -->
<head></head>
<body>
<button onclick="myOnclick()">Open a prompt box</button><br>
<span id="x1"></span>
<script>
function myOnclick() {
var x = prompt("Please enter your favourite fruit","apple");
document.getElementById("x1").innerHTML = "You entered: " + x
}
</script>
</body>
</html>
|
FUNCTION THAT MAY ASSIST IN TESTING WHETHER FEATURE IS SUPPORTED:
function isSupportedJavaScriptMethodWindowPrompt() {
return !!window.prompt;
} |
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