Reusing a script

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  • Luis
    #1

    Reusing a script

    I have a function sililar to the one below on one of my pages. It puts
    the value of a field on a form into a variable called FieldName:

    function checkSomething( ) {
    var FieldName = document.frmFor mName.FieldName .value
    }

    I'd like to reuse the function on a different page (instead of writing
    another almost identical script on that page), but I need to change the
    name of the field in the script depending on the page that the script is
    used on.

    How do I change the script so that I can put the script in an includes
    file and then pass the name of the field to the script according to the
    page that the script is being used?


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    Tags: None
    • Fred Oz
      #2
      Re: Reusing a script

      Luis wrote:[color=blue]
      > I have a function sililar to the one below on one of my pages. It puts
      > the value of a field on a form into a variable called FieldName:
      >
      > function checkSomething( ) {
      > var FieldName = document.frmFor mName.FieldName .value
      > }
      >
      > I'd like to reuse the function on a different page (instead of writing
      > another almost identical script on that page), but I need to change the
      > name of the field in the script depending on the page that the script is
      > used on.
      >
      > How do I change the script so that I can put the script in an includes
      > file and then pass the name of the field to the script according to the
      > page that the script is being used?
      >[/color]

      You can pass a reference to something rather than hard code the
      reference. Below some code that is fairly self explainatory.

      You could also pass the name or id of something as a string, then use
      something like:

      function checkSomething( x) {
      var theThing = document.getEle mentById(x);
      ....

      ... onclick="checkS omething('theFo rm');"....


      Cheers, Fred,



      It shows how to pass a reference to 'this',

      <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
      "http://www.w3.org/TR/html4/strict.dtd">
      <html>
      <head><title>Re use Script</title>
      <script type="text/javascript">
      function checkSomething( a) {
      var msg = 'You passed: ' + a;
      if (a == '') msg += 'an empty string';
      if (a.nodeName) msg += '\n Node name: ' +a.nodeName;
      if (a.type) msg += '\n Type: ' + a.type;
      if (a.id) msg += '\n ID: ' + a.id;
      if (a.name) msg += '\n NAME: ' + a.name;
      if (a.value) msg += '\n VALUE: ' + a.value;
      alert(msg);
      }
      </script>
      </head>
      <body>
      <div id="aDiv" onclick="checkS omething(this); "
      style="padding: 10px 30px 10px 30px; background-color: #99cccc;
      width: 200px; height 40px;">A clickable Div</div>
      <form action="" name="theForm">
      <input type="text" name="aTextInpu t" size="50"><br>
      <input type="button" name="aButton" value="Pass the form"
      onclick="checkS omething(this.f orm);">
      <input type="button" name="aButton" value="Pass the 'text' input"
      onclick="checkS omething(this.f orm.aTextInput) ;">
      <input type="button" name="aButton"
      value="Pass the 'text' input value"
      onclick="checkS omething(this.f orm.aTextInput. value);">
      <input type="reset" value="Reset">
      </form>
      </body>
      </html>

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        • Dr John Stockton
          #3
          Re: Reusing a script

          JRS: In article <41760c87$0$248 99$c397aba@news .newsgroups.ws> , dated
          Wed, 20 Oct 2004 06:58:15, seen in news:comp.lang. javascript, Luis
          <andyzaNOSPAM@w ebmail.co.za> posted :[color=blue]
          >
          >How do I change the script so that I can put the script in an includes
          >file and then pass the name of the field to the script according to the
          >page that the script is being used?[/color]

          Reading <URL:http://www.merlyn.demo n.co.uk/js-nclds.htm> should answer
          most of your needs.

          --
          © John Stockton, Surrey, UK. ?@merlyn.demon. co.uk Turnpike v4.00 IE 4 ©
          <URL:http://www.jibbering.c om/faq/> JL/RC: FAQ of news:comp.lang. javascript
          <URL:http://www.merlyn.demo n.co.uk/js-index.htm> jscr maths, dates, sources.
          <URL:http://www.merlyn.demo n.co.uk/> TP/BP/Delphi/jscr/&c, FAQ items, links.

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