about detecting javascript version

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  • Ricardo Garcia
    #1

    about detecting javascript version

    hi, i was just wondering about javascript version
    i used to do it putting in the <head>:

    <script type="text/javascript">
    jsver = "1.0";
    </script>
    <script language="JavaS cript1.1">
    jsver = "1.1";
    </script>
    <script language="JavaS cript1.2">
    jsver = "1.2";
    </script>
    <script language="JavaS cript1.3">
    jsver = "1.3";
    </script>
    <script language="JavaS cript1.4">
    jsver = "1.4";
    </script>
    <script language="JavaS cript1.5">
    jsver = "1.5";
    </script>

    and i got in the variable jsver the answer, but i dont think at all this is
    a good method

    Do you know a better way to do it??

    Thanks


    Tags: None
    • Andrew Thompson
      #2
      Re: about detecting javascript version

      On Fri, 24 Sep 2004 23:15:55 +0200, Ricardo Garcia wrote:
      [color=blue]
      > <script language="JavaS cript1.1">[/color]
      ...[color=blue]
      > ..i dont think at all this is a good method[/color]

      I agree.
      [color=blue]
      > Do you know a better way to do it??[/color]

      It depends what 'it' is, but the answer is probably
      'feature detection'.

      Get the hang of feature detection, and you will cease to care
      what version of JS the browser reports it is running.

      HTH

      --
      Andrew Thompson
      http://www.PhySci.org/codes/ Web & IT Help
      http://www.PhySci.org/ Open-source software suite
      http://www.1point1C.org/ Science & Technology
      http://www.lensescapes.com/ Images that escape the mundane

        Comment

        • Randy Webb
          #3
          Re: about detecting javascript version

          Ricardo Garcia wrote:
          [color=blue]
          > hi, i was just wondering about javascript version
          > i used to do it putting in the <head>:[/color]

          <--snip-->
          [color=blue]
          > and i got in the variable jsver the answer, but i dont think at all this is
          > a good method
          >
          > Do you know a better way to do it??[/color]

          <script type="text/javascript">
          if (condition){
          //code to execute
          }
          </script>

          Meaning, use the type attribute, forget the language attribute, and test
          for what you want to use in an if statement.

          --
          Randy
          comp.lang.javas cript FAQ - http://jibbering.com/faq

            Comment

            • Thomas 'PointedEars' Lahn
              #4
              Re: about detecting javascript version

              Ricardo Garcia wrote:
              [color=blue]
              > hi, i was just wondering about javascript version
              > i used to do it putting in the <head>:
              >
              > <script type="text/javascript">
              > jsver = "1.0";
              > </script>
              > [...]
              > and i got in the variable jsver the answer, but i dont think at all this
              > is a good method[/color]

              Correct. The first "script" element's content is processed by a JavaScript
              1.5 engine and if the UA does not interpret the "JavaScript ..." variants as
              expected, the result will be a false one.
              [color=blue]
              > Do you know a better way to do it??[/color]

              There is no (good) way to do it, use feature detection instead.


              PointedEars
              --
              Experience is life's consolation prize.

                Comment

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