accessing DOM

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  • J. J. Cale
    #1

    accessing DOM

    I want to access the DOM. Can something like this be done with PHP or a
    combination of PHP/JAVASCRIPT? not tested!
    <html><head><ti tle>DOM test</title>
    <?php
    $inFileName = 'test.js';
    $outFileName = 'jk.js';
    function doIt() {
    $dd = getElementById( 'first');
    $dd.innerText=$ outFileName;
    }
    ?>
    </head>
    <body>
    <p id="first" onclick="doIt() ">ClickMe<b r>
    <p onclick="first. innerText=$inFi leName">ClickMe <br>
    </body></html>


    Tags: None
    • Simon Stienen
      #2
      Re: accessing DOM

      "J. J. Cale" <photom@netvisi on.net.il> wrote:[color=blue]
      > I want to access the DOM. Can something like this be done with PHP or a
      > combination of PHP/JAVASCRIPT? not tested!
      > <html><head><ti tle>DOM test</title>
      > <?php
      > $inFileName = 'test.js';
      > $outFileName = 'jk.js';
      > function doIt() {
      > $dd = getElementById( 'first');
      > $dd.innerText=$ outFileName;
      > }
      > ?>
      > </head>
      > <body>
      > <p id="first" onclick="doIt() ">ClickMe<b r>
      > <p onclick="first. innerText=$inFi leName">ClickMe <br>
      > </body></html>[/color]

      Of course you can do it, you just have to assure the PHP code will not be
      parsed by your server and you have to find a browser which allows PHP, in
      extension to javascript, as client side scripting language.

      OTOH, if you want the client side javascript to call a server side PHP
      function, you have to generate a completely new HTTP-Request using
      document.locati on= or similar, resulting in a *completely* new page or in
      *no* new page (for example HTTP 204: No Content).
      If you want to *modify* the current page from within PHP using PHP on
      javascript variables that cleary shows you didn't understand the concept of
      a server side script language.
      --
      Simon Stienen <http://dangerouscat.ne t> <http://slashlife.de>
      »What you do in this world is a matter of no consequence,
      The question is, what can you make people believe that you have done.«
      -- Sherlock Holmes in "A Study in Scarlet" by Sir Arthur Conan Doyle

        Comment

        • david
          #3
          Re: accessing DOM

          [original snipped]
          [color=blue]
          > If you want to *modify* the current page from within PHP using PHP on
          > javascript variables that cleary shows you didn't understand the concept
          > of
          > a server side script language.[/color]

          With all due respect, this is of course, entirely possible. Perhaps before
          you say that people do not understand, you should first make sure that you
          understand it perfectly.



          On first blush, you would seem correct: JavaScript is client side, PHP is
          server side, and never the two shall mix. Yes, of course, you can use PHP to
          write JavaScript as the page is rendered, and yes of course, this works
          well.



          But, think about this... place an inline frame (hidden) on the page to
          modify the JavaScript variables from. Someone on your page is something that
          the user does (presumably; perhaps they select an item from a drop down
          list) that should cause a change. To make this happen, add a JavaScript
          function that replaces the URL of the inline frame. The new URL loads a PHP
          page which presumably does something (perhaps it gets data from a database).
          As the page finishes, it writes a JavaScript function that calls back to the
          opening page (the opener. syntax) and executes a function there; this
          function can now happily change variables in JavaScript (because it IS
          JavaScript). PHP can change JavaScript.



          I will grant you it is not a straightforward approach. I will also tell you
          that Apple has documented it quite well, and I have used it in production
          for over two years without a hitch. In my experience (a nice way to say
          things), this is a stable, reliable solution.



          OK. Just my two cents.

          david


            Comment

            • Simon Stienen
              #4
              Re: accessing DOM

              david <someone@micros oft.com> wrote:[color=blue]
              > [original snipped]
              >[color=green]
              >> If you want to *modify* the current page from within PHP using PHP on
              >> javascript variables that cleary shows you didn't understand the concept
              >> of
              >> a server side script language.[/color]
              >
              > With all due respect, this is of course, entirely possible. Perhaps before
              > you say that people do not understand, you should first make sure that you
              > understand it perfectly.[/color]

              Well... Maybe you have information I didn't know...
              [color=blue]
              > On first blush, you would seem correct: JavaScript is client side, PHP is
              > server side, and never the two shall mix. Yes, of course, you can use PHP to
              > write JavaScript as the page is rendered, and yes of course, this works
              > well.[/color]

              That's how far I was in the statement.
              [color=blue]
              > But, think about this... place an inline frame (hidden) on the page to
              > modify the JavaScript variables from. Someone on your page is something that
              > the user does (presumably; perhaps they select an item from a drop down
              > list) that should cause a change. To make this happen, add a JavaScript
              > function that replaces the URL of the inline frame. The new URL loads a PHP
              > page which presumably does something (perhaps it gets data from a database).
              > As the page finishes, it writes a JavaScript function that calls back to the
              > opening page (the opener. syntax) and executes a function there; this
              > function can now happily change variables in JavaScript (because it IS
              > JavaScript). PHP can change JavaScript.[/color]

              Ok, so far... But: It's not the PHP changing the JavaScript but the
              JavaScript which was written by the PHP in the inline frame, sounds like
              hair-splitting, but it *is* a difference. Further, you are not modifying
              the *current* page (which is the one in the iframe and completely
              reloaded), but the parent page which contains the iframe.

              I know this seems obvious, but if you take the small technical details,
              you'll see, that my previous posting perfectly matches your case, too.
              --
              Simon Stienen <http://dangerouscat.ne t> <http://slashlife.de>
              »What you do in this world is a matter of no consequence,
              The question is, what can you make people believe that you have done.«
              -- Sherlock Holmes in "A Study in Scarlet" by Sir Arthur Conan Doyle

                Comment

                • david
                  #5
                  Re: accessing DOM

                  Simon:
                  [color=blue]
                  > Well... Maybe you have information I didn't know...[/color]

                  I didn't know this either until I stumbled across one fine day. <grin>
                  [color=blue]
                  > Ok, so far... But: It's not the PHP changing the JavaScript but the
                  > JavaScript which was written by the PHP in the inline frame, sounds like
                  > hair-splitting, but it *is* a difference. Further, you are not modifying
                  > the *current* page (which is the one in the iframe and completely
                  > reloaded), but the parent page which contains the iframe.
                  >
                  > I know this seems obvious, but if you take the small technical details,
                  > you'll see, that my previous posting perfectly matches your case, too.[/color]

                  I have no wish to split hairs, and you are correct as well.

                  To me, it seemed the OP wanted the ability to affect JavaScript from PHP
                  (again, presumably because they are digging information out of a database or
                  other backend system/process, which I do not know how to do with just
                  JavaScript.); what I was suggesting does just that. The end result is that
                  PHP, um, adjusts JavaScript. It is just in a rather odd roundabout way. But,
                  I think the important thing is that the end user does not seem all the
                  backend stuff, and at the end of the day, that is the most important thing:
                  usability and a friendly page.

                  OK. Thanks for a good reply, Simon! I hope you have a most excellent day! (I
                  like it when everyone is right!)
                  david



                    Comment

                    • Chung Leong
                      #6
                      Re: accessing DOM

                      > OTOH, if you want the client side javascript to call a server side PHP[color=blue]
                      > function, you have to generate a completely new HTTP-Request using
                      > document.locati on= or similar, resulting in a *completely* new page or in
                      > *no* new page (for example HTTP 204: No Content).
                      > If you want to *modify* the current page from within PHP using PHP on
                      > javascript variables that cleary shows you didn't understand the concept[/color]
                      of[color=blue]
                      > a server side script language.[/color]

                      You can actually do that in ASP.NET. You can attach server-side functions to
                      client-side events. You can also modify the document via the DOM on the
                      server-side.


                        Comment

                        • Berislav Lopac
                          #7
                          Re: accessing DOM

                          On Sat, 25 Sep 2004 09:16:16 +0200, J. J. Cale wrote:
                          [color=blue]
                          > I want to access the DOM. Can something like this be done with PHP or a
                          > combination of PHP/JAVASCRIPT? not tested!
                          > <html><head><ti tle>DOM test</title>
                          > <?php
                          > $inFileName = 'test.js';
                          > $outFileName = 'jk.js';
                          > function doIt() {
                          > $dd = getElementById( 'first');
                          > $dd.innerText=$ outFileName;
                          > }
                          > ?>
                          > </head>
                          > <body>
                          > <p id="first" onclick="doIt() ">ClickMe<b r>
                          > <p onclick="first. innerText=$inFi leName">ClickMe <br>
                          > </body></html>[/color]

                          DOM is a standards-defined XML API, not a Javascript feature. Many of
                          languages have DOM support, including PHP.

                          Be aware, however, that DOM support in PHP4 is not very good; I strongly
                          suggest to use PHP5 to use DOM, if possible.

                          Berislav

                            Comment

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