Problems scraping data from web page

General
1

Good evening, I have been trying for three days to retrieve data from an HTML page using the HTML node.
Unfortunately, I am only able to partially extract the data. I would like to understand what I am doing wrong.

This is the html code of the page.

<body class="stileSito">

    <!-- logo aquatronica -->
    <p align="center"><img border="0" src="./Aquatronica System Controller - Ethernet Controller - v. 1.1 - Real Time Monitor_files/logo.gif" width="350" height="64"></p>

    <!-- titolo della pagina -->
    <p class="titoloPaginaRTM">Real Time Monitor</p>
    <center><p class="styleStatusErrComm" id="_ERR_BUS"></p></center>
    <center><p align="center" id="_PULSANTE_LOGOUT"></p></center>
    <hr>
    <!-- tabella principale -->
    <table border="0" width="100%">
      <tbody>
        <tr>
          <!-- sottotabella per unita' di potenza -->
          <td width="70%" valign="top">
            <b>Power Units</b><br>
            <table border="1" width="100%" bordercolor="#000000" cellspacing="0" cellpadding="2" bordercolorlight="#000000" bordercolordark="#000000">
              <tbody id="_LISTA_PU">
                <tr>
                  <td width="20%" class="intestazionePowerUnit" height="40" xml:space="preserve"> </td>
                  <td width="10%" class="intestazionePowerUnit">A</td>
                  <td width="10%" class="intestazionePowerUnit">B</td>
                  <td width="10%" class="intestazionePowerUnit">C</td>
                  <td width="10%" class="intestazionePowerUnit">D</td>
                  <td width="10%" class="intestazionePowerUnit">E</td>
                  <td width="10%" class="intestazionePowerUnit">F</td>
                  <td width="10%" class="intestazionePowerUnit">G</td>
                  <td width="10%" class="intestazionePowerUnit">H</td>
                </tr>

              <tr><td class="intestazionePowerUnit">Unit� di Potenza</td><td class="cellePlug" align="center" style="border: 6px ridge silver; border-spacing: 1px;"><map title="Plug: CO2  - Status: OFF" indexpu="0" indexplug="0" style="width: 100%; height: 100%;"><img src="./Aquatronica System Controller - Ethernet Controller - v. 1.1 - Real Time Monitor_files/bianco.gif" border="1px" style="border-style: dotted;"></map></td><td class="cellePlug" align="center" style="border: 6px ridge blue; border-spacing: 1px;"><map title="Plug: MODULO ETH  - Status: ON - Timer program" indexpu="0" indexplug="1" style="width: 100%; height: 100%;"><img src="./Aquatronica System Controller - Ethernet Controller - v. 1.1 - Real Time Monitor_files/orologio.gif"></map></td><td class="cellePlug" align="center" style="border: 6px ridge silver; border-spacing: 1px;"><map title="Plug: C  - Status: OFF" indexpu="0" indexplug="2" style="width: 100%; height: 100%;"><img src="./Aquatronica System Controller - Ethernet Controller - v. 1.1 - Real Time Monitor_files/bianco.gif" border="1px" style="border-style: dotted;"></map></td><td class="cellePlug" align="center" style="border: 6px ridge blue; border-spacing: 1px;"><map title="Plug: WIFI TO ETH  - Status: ON - Timer program" indexpu="0" indexplug="3" style="width: 100%; height: 100%;"><img src="./Aquatronica System Controller - Ethernet Controller - v. 1.1 - Real Time Monitor_files/orologio.gif"></map></td><td class="cellePlug" align="center" style="border: 6px ridge silver; border-spacing: 1px;"><map title="Plug: NEON  - Status: OFF" indexpu="0" indexplug="4" style="width: 100%; height: 100%;"><img src="./Aquatronica System Controller - Ethernet Controller - v. 1.1 - Real Time Monitor_files/bianco.gif" border="1px" style="border-style: dotted;"></map></td><td class="cellePlug" align="center" style="border: 6px ridge blue; border-spacing: 1px;"><map title="Plug: RISCALDATORE  - Status: ON - Temperature sensor program" indexpu="0" indexplug="5" style="width: 100%; height: 100%;"><img src="./Aquatronica System Controller - Ethernet Controller - v. 1.1 - Real Time Monitor_files/temperatura.gif"></map></td><td class="cellePlug" align="center" style="border: 6px ridge blue; border-spacing: 1px;"><map title="Plug: FILTRO  - Status: ON - Timer program" indexpu="0" indexplug="6" style="width: 100%; height: 100%;"><img src="./Aquatronica System Controller - Ethernet Controller - v. 1.1 - Real Time Monitor_files/orologio.gif"></map></td><td class="cellePlug" align="center" style="border: 6px ridge silver; border-spacing: 1px;"><map title="Plug: AERATORE  - Status: OFF" indexpu="0" indexplug="7" style="width: 100%; height: 100%;"><img src="./Aquatronica System Controller - Ethernet Controller - v. 1.1 - Real Time Monitor_files/bianco.gif" border="1px" style="border-style: dotted;"></map></td></tr></tbody>
            </table>
            <div id="_LEGENDA" class="legenda"></div>
          </td>

          <!-- sottotabella per elenco sensori -->
          <td width="30%" valign="top">
            <b>Sensors</b>
            <table border="0" width="100%" cellpadding="2" class="listaSensori">
              <!-- lista dei sensori -->
              <tbody id="_LISTA_SENSORI"><tr>
                <td class="nomeSensore" style="width: 50%;">Temperatura</td>
                <td class="valoreSensore" style="width: 50%; background-color: red;"> !!! 19.9�C !!! </td></tr>
                <tr><td class="nomeSensore" style="width: 50%;">pH</td>
                  <td class="valoreSensore" style="width: 50%; background-color: aqua;">6.56</td></tr>
              </tbody>
            </table>
          </td>
        </tr>
      </tbody>
    </table>

    <hr>
    <input type="button" class="stylePulsanteComando" name="b" value="Start Real Time Monitor" onclick="startRTMonitor()">
    <input type="button" class="stylePulsanteComando" name="b" value="Stop Real Time Monitor" onclick="stopRTMonitor()">
    <input type="button" class="stylePulsanteComando" name="disImg" id="_YES_NO_IMG" value="No icons">
    <p id="_STATUS_BAR"><div class="styleStatusBar"><span>Real Time Monitor OFF</span></div></p>
    <p>
      </p><center>
        <p class="piePaginaRT">�Copyright 2006 Aquatronica�</p>
        <p class="piePaginaRT"><a href="http://www.aquatronica.it/"><b>www.aquatronica.it</b></a></p>
        <p class="piePaginaRT"><a href="mailto:info@aquatronica.com"><b>info@aquatronica.com</b></a></p>
      </center>
    <p></p>
  <p id="_PROGRESS_BAR">&nbsp;<div class="styleStatusWait"></div></p>
  <div id="_NO_CONNECTION_BAR" style="position:absolute;top:1;left:1">&nbsp;<div class="styleStatusErrComm"></div></div>
  <div id="_EXIT" style="font-size:10;font-weight:bold;position:absolute;top:1;right:10"><a id="_BACK_HOME" href="http://192.168.1.45/index.htm" title="Aquarium Home Page">&lt;&lt; Home Page</a></div>

  <!-- <input type="button" name="bb" value="copy" onclick="var n = document.getElementById('_ORIGINE').cloneNode(true);document.getElementById('_DESTINAZIONE').appendChild(n);"/> -->

  <div id="_NASCOSTO" style="display:none">

I,m trying to read this 2 values:

              <tbody id="_LISTA_SENSORI">
                <tr>
                <td class="nomeSensore" style="width: 50%;">Temperatura</td>
                <td class="valoreSensore" style="width: 50%; background-color: red;"> !!! 19.9�C !!! </td>
                </tr>
                <tr>
                <td class="nomeSensore" style="width: 50%;">pH</td>
                <td class="valoreSensore" style="width: 50%; background-color: aqua;">6.56</td>
                </tr>

In my html node i have put this on the selector field:

body>table>tbody>tr>td>table.listaSensori>tbody#_LISTA_SENSORI>tr:nth-child(1)>td.nomeSensore

B

Cattura
Cattura835×851 45.4 KB

ut it returns me an empty object.

What's wrong??

Thank you all, Marco.

2

Did you try to use only #_LISTA_SENSORI as selector field ?

3

Try selector td.valoreSensore
and select only text of element.

And if you want the names to try td.valoreSensore , td.nomeSensore

4

I resolved finding an xml with all the values..

Thank for your support, Marco.