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<title>PhpWiki - Searching For Data</title>
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<div class="wikitext"><p>Searching for data is one of the most challenging tasks in a web page due to its seemingly unstructured (or badly structured) form. Complex searches are now possible with the parser in a simple to use API. Here's an example :</p>
<p>We are looking at a page which has the following html:</p>
<pre>
<html>
...
<body>
<table>
<tr>
<td><font size="-1">Name:<b><i>John Doe</i></b></font></td>
..
</tr>
<tr>
..
</tr>
</table>
</body>
</html></pre>
<p>We'd like to extract the information corresponding to the field "Name". This is possible if we make use of the fact that the name appears two tags after "Name".</p>
<p>Code to achieve this would look like:</p>
<pre>
Node nodes [] = parser.extractAllNodesThatAre(TableTag.class);
// Get the first table found
TableTag table = (TableTag)nodes[0];
// Find the position of Name.
StringNode [] stringNodes = table.digupStringNode("Name");
StringNode name = stringNodes[0];
// We assume that the first node that matched is the one we want. We
// navigate to its parent, the column tag <td>
CompositeTag td = name.getParent();
// From the parent, we shall find out the position of "Name"
int posOfName = td.findPositionOf(name);
// Its easy now to navigate to John Doe, as we know it is 3 positions away
Node expectedName = td.childAt(posOfName + 3);
</pre>
<hr /><p>You can move up the parent tree - e.g. when the data is in seperate columns,</p>
<pre>
<html>
...
<body>
<table>
<tr>
<td><font size="-1">Name:</font></td>
<td><font size="-1">John Doe</font></td>
</tr>
<tr>
..
</tr>
</table>
</body>
</html></pre>
<p>We'd like to perform the same search on "Name".</p>
<p>Code to achieve this would look like:</p>
<pre>
Node nodes [] = parser.extractAllNodesThatAre(TableTag.class);
// Get the first table found
TableTag table = (TableTag)nodes[0];
// Find the position of Name.
StringNode [] stringNodes = table.digupStringNode("Name");
// We assume that the first node that matched is the one we want. We
// navigate to its parent (column <td>)
CompositeTag td = stringNodes[0].getParent();
// Navigate to its parent (row <tr>)
CompositeTag tr = parentOfName.getParent();
// From the parent, we shall find out the position of the column
int columnNo = tr.findPositionOf(td);
// Its easy now to navigate to John Doe, as we know it is in the next column
TableColumn nextColumn = (TableColumn)tr.childAt(columnNo+1);
// The name is the second item in the column tag
Node expectedName = nextColumn.childAt(1);</pre>
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