mirror of
https://github.com/sigmasternchen/php-doc-en
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ae447c60cd
git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@225980 c90b9560-bf6c-de11-be94-00142212c4b1
109 lines
2.9 KiB
XML
109 lines
2.9 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.9 $ -->
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<refentry id="function.dom-domdocument-getelementbyid">
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<refnamediv>
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<refname>DOMDocument->getElementById()</refname>
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<refpurpose>Searches for an element with a certain id</refpurpose>
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</refnamediv>
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<refsect1 role="description">
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&reftitle.description;
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<classsynopsis>
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<ooclass><classname>DOMDocument</classname></ooclass>
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<methodsynopsis>
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<type>DOMElement</type><methodname>getElementById</methodname>
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<methodparam><type>string</type><parameter>elementId</parameter></methodparam>
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</methodsynopsis>
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</classsynopsis>
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<para>
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This function is similar to
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<xref linkend="function.dom-domdocument-getelementsbytagname" /> but
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searches for an element with a given id.
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</para>
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<para>
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For this function to work, you will need either to set some ID attributes
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with <xref linkend="function.dom-domelement-setidattribute" />
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or a DTD which defines an attribute to be of type ID.
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In the later case, you will need to validate your document with
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<xref linkend="function.dom-domdocument-validate" />
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or <literal>DOMDocument->validateOnParse</literal> before using this function.
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</para>
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</refsect1>
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<refsect1 role="parameters">
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&reftitle.parameters;
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<para>
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<variablelist>
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<varlistentry>
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<term><parameter>elementId</parameter></term>
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<listitem>
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<para>
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The unique id value for an element.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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</refsect1>
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<refsect1 role="returnvalues">
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&reftitle.returnvalues;
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<para>
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Returns the <classname>DOMElement</classname> or &null; if the element is
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not found.
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</para>
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</refsect1>
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<refsect1 role="examples">
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&reftitle.examples;
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<example>
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<title>DOMDocument->getElementById() Example</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$doc = new DomDocument;
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// We need to validate our document before refering to the id
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$doc->validateOnParse = true;
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$doc->Load('book.xml');
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echo "The element whose id is books is: " . $doc->getElementById('books')->tagName . "\n";
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?>
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]]>
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</programlisting>
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&example.outputs;
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<screen>
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<![CDATA[
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The element whose id is books is: chapter
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]]>
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</screen>
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</example>
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</refsect1>
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<refsect1 role="seealso">
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&reftitle.seealso;
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<para>
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<simplelist>
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<member><xref linkend="function.dom-domdocument-getelementsbytagname" /></member>
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</simplelist>
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</para>
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</refsect1>
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</refentry>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"../../../../manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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