Window Alert
Sometimes you want to inform your audiences of certain information before they enter your website. For example, if your page requires a certain browser (using the "System Detection" JavaScript), you could alert your audiences to this before your page loads with an alert window. Here are the lines of code; play around with them and see what you can do. There are different ways alert windows could be implemented into a page:
<script language="JavaScript">
window.alert("Your Browser: " + navigator.appName);
</script>
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The above lines of code placed in the head of your document will generate the alert window you saw when this page loaded. Here is a basic breakdown of what each part means:
- "Your Browser"—any actual text of your own that you want to appear in the the alert window should be placed in quotation marks
- navigator.appName—anything that is a JavaScript function or variable should not be in quotation marks, but should just be in the parentheses
- +—when you have more than one component (a text string, variable, etc.) that you want to be displayed, you join the components with a plus sign
You could also make links that alert users to information, as shown in the example below:
The above lines of code placed in the body of your document will allow users to click the link and get the URL information. Here is the code:
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<p>Click here for <a href="#" onclick="window.alert('Current Page: ' + location.href); return false;">this page URL</a>.</p>
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Writing for the World Wide Web
Planning Site Navigation