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Xpath
Discuss Xpath in the PHP Development forum on Dev Shed.
Xpath PHP Development forum discussing coding practices, tips on PHP, and other PHP-related topics. PHP is an open source scripting language that has taken the web development industry by storm.
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December 25th, 2012, 12:21 AM
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Registered User
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Join Date: Nov 2012
Posts: 25
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Xpath
Hi, my earlier post, I resolved the Pagination for XML. Now the issue is the data output is all the nodes in the XML. I need some help to use xpath to find some text within the codes and output in the pagination.
---Catalog.xml---
Code:
<?xml version="1.0" encoding="ISO-8859-1"?>
<Catalog>
<Category>
<Name>Arts</Name>
<Site>
<Title>Photography 1</Title>
<Description>This is Lesson 1 of Photography</Description>
</Site>
<Site>
<Title>Photography 2</Title>
<Description>This is Lesson 2 of Photography</Description>
</Site>
</Category>
</Catalog>
----search.php----
PHP Code:
Php
class Pagination {
protected
//Configuration defaults
$_arrConfig = array(
'limit'=>10
,'page'=>1
,'basePath'=>'#'
,'label'=>'Items'
,'visiblePages'=>7
,'pageFlag'=>'{page}'
)
//Data to be passed to template
,$_arrTemplateData = array()
//function to pass resolved offset and limit
,$_onPaginate
//extra arguments to pass to to pagination callback such as data source or db connection
,$_arrArgs;
public function __construct($onPaginate,$arrConfig=array(),$arrArgs=array()) {
$this->_onPaginate = $onPaginate;
$this->_arrArgs = $arrArgs;
foreach($arrConfig as $strKey=>$mixValue) {
if(array_key_exists($strKey,$this->_arrConfig)) {
$this->_arrConfig[$strKey] = $mixValue;
}
}
}
public function paginate() {
//Calculate page offset
$intOffset = ($this->_arrConfig['page']-1)*$this->_arrConfig['limit'];
//Paginate and get number of found rows
$intFoundRows = call_user_func_array($this->_onPaginate,array_merge(array($intOffset,$this->_arrConfig['limit']),$this->_arrArgs));
//Assign template data
$this->_arrTemplateData['limit'] = $this->_arrConfig['limit'];
$this->_arrTemplateData['page'] = $this->_arrConfig['page'];
$this->_arrTemplateData['offset'] = $intOffset;
$this->_arrTemplateData['found_rows'] = $intFoundRows;
$this->_arrTemplateData['total_pages'] = $intFoundRows < $this->_arrConfig['limit']?1:ceil($intFoundRows/$this->_arrConfig['limit']);
$this->_arrTemplateData['visible_pages'] = $this->_arrConfig['visiblePages'];
$this->_arrTemplateData['base_path'] = $this->_arrConfig['basePath'];
$this->_arrTemplateData['label'] = $this->_arrConfig['label'];
$this->_arrTemplateData['page_flag'] = $this->_arrConfig['pageFlag'];
//Return the pagination template
return $this->display();
}
public function display() {
extract($this->_arrTemplateData);
if($total_pages <= $visible_pages) {
$page_start = 1;
$page_end = $total_pages;
} else if($page <= ceil($visible_pages/2)) {
$page_start = 1;
$page_end = $visible_pages;
} else if($page > ($total_pages - ceil($visible_pages/2))) {
$page_start = $total_pages - (ceil(($visible_pages/2)*2)-1);
$page_end = $total_pages;
} else {
$page_start = $page-(floor($visible_pages/2));
$page_end = $page+(floor($visible_pages/2));
}
$return.= sprintf('<ul class="pagination">');
$return.= sprintf(
'<li class="first">%s%s%s</li>'
,$page == 1?'':sprintf('<a href="%s">',str_replace($page_flag,1,$base_path))
,'First'
,$page == 1?'':'</a>'
);
$return.= sprintf(
'<li class="previous">%s%s%s</li>'
,$page == 1?'':sprintf('<a href="%s">',str_replace($page_flag,($page-1),$base_path))
,'Previous'
,$page == 1?'':'</a>'
);
foreach(range($page_start,$page_end,1) as $i) {
$return.= sprintf (
'<li%s>%s%s%s</li>'
,$page == $i?' class="current"':''
,$page == $i?'':sprintf('<a href="%s">',str_replace($page_flag,$i,$base_path))
,$i
,$page == $i?'':'</a>'
);
}
$return.= sprintf (
'<li class="next">%s%s%s</li>'
,$page == $total_pages?'':sprintf('<a href="%s">',str_replace($page_flag,($page+1),$base_path))
,'Next'
,$page == $total_pages?'':'</a>'
);
$return.= sprintf(
'<li class="last">%s%s%s</li>'
,$page == $total_pages?'':sprintf('<a href="%s">',str_replace($page_flag,$total_pages,$base_path))
,'Last'
,$page == $total_pages?'':'</a>'
);
$return.= sprintf('</ul>');
return $return;
}
}
class Action {
private $_objXML;
private $_arrMessages = array();
public function __construct() {
$this->_objXML = simplexml_load_file("Catalog.xml");
}
public function paginate($offset,$limit) {
[COLOR=DarkRed]$arrMessages = $this->_objXML->xpath('//Category[1]/Site/Description[contains(.,'Photo')] | //Category[1]/Site/Title[contains(.,'Photo')]');[/COLOR]
if(isset($arrMessages[$offset])) {
for($i=0;$i<$limit;$i++) {
if(!isset($arrMessages[($i+$offset)])) break;
$this->_arrMessages[] = array(
'Title'=>(string) $arrMessages[($i+$offset)]->Title.'</a>'
,'Description'=>(string) $arrMessages[($i+$offset)]->Description
);
}
}
// return number of total found rows
return count($arrMessages);
}
public function getMessages() {
return $this->_arrMessages;
}
}
$action = new Action();
$func = create_function('$offset,$limit,$action','return $action->paginate($offset,$limit);');
$pg = new Pagination($func,array(
'basePath'=>$_SERVER['PHP_SELF'].'?p={replace_me_with_page}'
,'pageFlag'=>'{replace_me_with_page}'
,'label'=>'Messages'
,'limit'=>10
,'page'=>isset($_GET['p']) && is_numeric($_GET['p']) && $_GET['p'] != 0?$_GET['p']:1
,'visiblePages'=>7
),array($action));
---Error from Browser---
Parse error: syntax error, unexpected T_STRING in /home/a9729307/public_html/test.php on line 138 within
class Action { }
--------------------
I checked xpath line is correct using online XML --> Xpath tools the code line is correct but not sure the method I used is correct?
What I want to do:
1. Search the node Title and Description for a word containing "Photo"
2. Output the Title and Description NodeValue
Can someone advice where I went wrong?
Thanks and Merry Christmas.
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December 25th, 2012, 02:57 AM
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Still alive
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Join Date: Mar 2007
Location: Washington, USA
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PHP Code:
$this->_objXML->xpath('//Category[1]/Site/Description[contains(.,'Photo')] | //Category[1]/Site/Title[contains(.,'Photo')]');
Check the quotes.
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December 25th, 2012, 05:02 AM
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Registered User
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Join Date: Nov 2012
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Quote: | Originally Posted by requinix
PHP Code:
$this->_objXML->xpath('//Category[1]/Site/Description[contains(.,'Photo')] | //Category[1]/Site/Title[contains(.,'Photo')]');
Check the quotes. |
PHP Code:
$this->_objXML->xpath('//Category[1]/Site/Description[contains(.,"Photo")] | //Category[1]/Site/Title[contains(.,"Photo")]');
Thanks requinix. I changed the query to double quotes, but now there is no error and the result is blank. Any idea? Is my class function correct?
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December 25th, 2012, 07:13 AM
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Registered User
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I did a test at http://xpath.online-toolz.com/tools/xpath-editor.php
XPATH Statment
//Category[1]/Site/Description[contains(.,"Photo")] | //Category[1]/Site/Title[contains(.,"Photo")]
Result:
<Title>Photography 1</Title>
-----------------------
<Description>This is Lesson 1 of Photography</Description>
-----------------------
<Title>Photography 2</Title>
-----------------------
<Description>This is Lesson 2 of Photography</Description>
When I insert the same code to my coding, no result shown.
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December 25th, 2012, 02:26 PM
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Still alive
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Join Date: Mar 2007
Location: Washington, USA
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And where is the code that would output something?
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December 25th, 2012, 06:35 PM
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Registered User
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Join Date: Nov 2012
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Quote: | Originally Posted by requinix And where is the code that would output something? |
Sorry missed that out, here it is
-------
Code:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html lang="en">
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
<title>Catalog</title>
<script type="text/javascript" src="java.js" ></script>
<link rel="stylesheet" href="paginate.css" type="text/css" />
<link rel="stylesheet" href="style.css" type="text/css" />
</head>
<body>
<?php echo $pg->paginate(); ?>
<?php
if($action->getMessages()) {
echo '<ol>';
foreach($action->getMessages() as $arrMessage) {
printf(
'<h2><li>
<p><h3>%s</h2></p>
<p><h4>%s</h3></p>
<br />
</li>'
,$arrMessage['Title']
,$arrMessage['Description']
);
}
echo '</ol>';
} else {
echo "<p>No messages available</p>";
}?>
<?php echo $pg->paginate(); ?>
<br /><br />
</div>
</body>
</html>
------
I got a "No messages available" displayed.
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December 26th, 2012, 06:59 PM
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Registered User
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Join Date: Nov 2012
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Should I use SIMPLEXML and Xpath or should I use DOM and DOMXPATH
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December 26th, 2012, 08:52 PM
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Still alive
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Join Date: Mar 2007
Location: Washington, USA
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IMO SimpleXML is easier but it doesn't really matter.
What do you see if you do a View Source on the page? Have you made sure your php.ini is set up to show you errors during development?
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December 27th, 2012, 01:47 AM
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Sorry, where is this php.ini? I am using codelobster for php to develop. Cannot find this php.ini. Please guide me.
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December 27th, 2012, 04:46 AM
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Still alive
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Join Date: Mar 2007
Location: Washington, USA
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phpinfo will tell you, right near the top of its huge output. While you're there look for the display_errors setting: it should be on.
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December 28th, 2012, 12:32 AM
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Join Date: Nov 2012
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Quote: | Originally Posted by requinix phpinfo will tell you, right near the top of its huge output. While you're there look for the display_errors setting: it should be on. |
The setting is on.
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December 28th, 2012, 01:48 AM
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Registered User
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Join Date: Nov 2012
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I did a simple test and got the xpath code correct as follows:
->xpath('//Title[contains(.,"Photo")]');
The problem is when I use the same code in the pagination code,
class Action{}
It does not work.
Any idea? Has it something to do with using class?
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January 1st, 2013, 08:46 AM
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Join Date: Nov 2012
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Anyone able to advise which part of the coding is wrong?
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January 2nd, 2013, 07:58 PM
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Registered User
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Yes, finally got this solve.
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