JavaScript Feature Reference: indexOf() Method On Strings Web Browser Support Test

Last reviewed/updated: 28 Nov 2017 | Published: 27 Oct 2017 | Status: Active
Web browser support: Internet Explorer 10+, Edge 12+, Firefox 6+, Chrome 30+, Opera 17+

1. Introduction

In this web page there are two web browser JavaScript feature support tests; 1.) a feature implementation test, and 2.) a feature capability test. First, the implementation test is run. The implementation test determines if the web browser recognizes the JavaScript indexOf() method on strings. The implementation test is a simple test for the presence of web browser support, and a definitive test for the absence of web browser support. If the web browser does not recognize the JavaScript indexOf() method on strings, the testing is stopped and the implementation test reports: Fail (no support): The web browser does not recognize the JavaScript indexOf() method on strings. The web browser does not support the JavaScript indexOf() method on strings.

If the web browser recognizes the JavaScript indexOf() method on strings, the capability test is run. The capability test determines if the web browser's implementation of the JavaScript indexOf() method on strings includes support for at least one indexOf() method on strings capability. The capability test is a more definitive, albeit not an all inclusive, test for the presence of web browser support. If the web browser's implementation of the JavaScript indexOf() method on strings includes support for the tested capability, the capability test reports: Pass (at least partial/possibly full support): The web browser recognizes the JavaScript indexOf() method on strings, and supports at least one indexOf() method on strings capability. The web browser at least partially/possibly fully supports the JavaScript indexOf() method on strings. Positive determination of full web browser support is beyond the scope of this test. If the web browser's implementation of the JavaScript indexOf() method on strings does not include support for the tested capability, the capability test reports: Pass/Fail (partial support): The web browser recognizes the JavaScript indexOf() method on strings, but does not support at least one indexOf() method on strings capability. The web browser partially supports the JavaScript indexOf() method on strings.

The web browser support test source code is shown in Section 2.1. The web browser support test source code is run in Section 2.2, which shows the web browser support test result.

1.1. indexOf() Method On Strings Web Browser Support

Pass (at least partial/possibly full support): IE6+, ED12+, FF1.5+, SF3.1+, CH2+, OP7.50+.

1.2. Abbreviations

  • IE = Internet Explorer.
  • ED = Edge = EdgeHTML rendering engine (ED12+) and/or Edge browser (ED20+).
  • FF = Firefox.
  • SF = Safari.
  • CH = Chrome.
  • OP = Opera.

2. indexOf() Method On Strings Web Browser Support Test

2.1. Web Browser Support Test Source Code

<script>
var string = "abc def ghi";
if (string.indexOf){
 if (string.indexOf("def") === 4){
  document.write("<p><b>Pass</b> (at least partial/possibly full support): The web browser recognizes the JavaScript <code>indexOf()</code> method on strings, and supports at least one <code>indexOf()</code> method on strings capability. The web browser at least partially/possibly fully supports the JavaScript <code>indexOf()</code> method on strings. Positive determination of full web browser support is beyond the scope of this test.</p>");
 } else {
  document.write("<p><b>Pass/Fail</b> (partial support): The web browser recognizes the JavaScript <code>indexOf()</code> method on strings, but does not support at least one <code>indexOf()</code> method on strings capability. The web browser partially supports the JavaScript <code>indexOf()</code> method on strings.</p>");
 }
} else {
 document.write("<p><b>Fail</b> (no support): The web browser does not recognize the JavaScript <code>indexOf()</code> method on strings. The web browser does not support the JavaScript <code>indexOf()</code> method on strings.</p>");
}
</script>

2.2. Web Browser Support Test Result


3. Resources And Additional Information