Web Front-endJS TutorialIs Using `navigator.appName` and `navigator.appVersion` Reliable for Detecting Older IE Versions?
Detect IE Version (Prior to v9) in JavaScript
Detection Criteria and Proposed Code
To determine if a user is accessing a website using a version of Internet Explorer prior to v9, the proposed code leverages the navigator.appName and navigator.appVersion properties.
if (navigator.appName.indexOf("Internet Explorer") != -1) {
// User is using IE
// Check for IE version <p><strong>Will This Code Do the Trick?</strong></p><p>Despite addressing the concerns raised about user agent string spoofing and feature support detection, the proposed code has several limitations:</p>
- Conditional statements: While conditional statements are useful for targeting different IE versions, they are only supported in IE5-9, so this approach is obsolete in modern browsers.
- Precision (IE 1 and IE 10 ): The code fails to detect IE 1 and IE versions greater than or equal to 10.
- Completeness: The code only checks for IE versions less than 9, ignoring potential edge cases.
A Preferred Alternative
To overcome these limitations, a more comprehensive approach involves using CSS class-based detection:
- Define CSS classes that represent different IE versions, e.g.:
html.lt-ie9 { ... }
html.lt-ie8 { ... }
html.lt-ie7 { ... }
- Apply these classes to the element based on the detected IE version:
<!--[if lt IE 7]> <html class="lt-ie9 lt-ie8 lt-ie7"> <![endif]--> <!--[if IE 7]> <html class="lt-ie9 lt-ie8"> <![endif]--> <!--[if IE 8]> <html class="lt-ie9"> <![endif]--> <!--[if gt IE 8]><!--> <!--<![endif]-->
- Use CSS to specify styles specific to the detected IE version, or implement JavaScript logic based on the assigned class:
if ($('html').is('.lt-ie7, .lt-ie8, .lt-ie9')) {
// IE version <p>This method provides more flexibility, compatibility, and control for handling different browser versions.</p>The above is the detailed content of Is Using `navigator.appName` and `navigator.appVersion` Reliable for Detecting Older IE Versions?. For more information, please follow other related articles on the PHP Chinese website!
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