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 <span id="projectnumber">3.2.3</span>
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<!-- doxytag: class="Wt::WValidator" --><!-- doxytag: inherits="Wt::WObject" -->
<p>A validator is used to validate user input according to pre-defined rules.
<a href="classWt_1_1WValidator.html#details">More...</a></p>
<p><code>#include <Wt/WValidator></code></p>
<div class="dynheader">
Inheritance diagram for Wt::WValidator:</div>
<div class="dyncontent">
<div class="center"><img src="classWt_1_1WValidator__inherit__graph.png" border="0" usemap="#Wt_1_1WValidator_inherit__map" alt="Inheritance graph"/></div>
<map name="Wt_1_1WValidator_inherit__map" id="Wt_1_1WValidator_inherit__map">
<area shape="rect" href="classWt_1_1Auth_1_1AbstractPasswordService_1_1AbstractStrengthValidator.html" title="Validator for password strength." alt="" coords="311,5,695,32"/><area shape="rect" href="classWt_1_1WDateValidator.html" title="A validator for date input." alt="" coords="435,56,571,83"/><area shape="rect" href="classWt_1_1WDoubleValidator.html" title="A validator for validating floating point user input." alt="" coords="428,107,577,133"/><area shape="rect" href="classWt_1_1WIntValidator.html" title="A validator that validates integer user input." alt="" coords="441,157,564,184"/><area shape="rect" href="classWt_1_1WLengthValidator.html" title="A validator that checks the string length of user input." alt="" coords="429,208,576,235"/><area shape="rect" href="classWt_1_1WRegExpValidator.html" title="A validator that checks user input against a regular expression." alt="" coords="425,259,580,285"/><area shape="rect" href="classWt_1_1WObject.html" title="A base class for objects that participate in the signal/slot system." alt="" coords="7,132,103,159"/><area shape="rect" href="classWt_1_1Auth_1_1PasswordStrengthValidator.html" title="A default implementation for password strength validation." alt="" coords="744,5,981,32"/></map>
<center><span class="legend">[<a href="graph_legend.html">legend</a>]</span></center></div>
<p><a href="classWt_1_1WValidator-members.html">List of all members.</a></p>
<table class="memberdecls">
<tr><td colspan="2"><h2><a name="nested-classes"></a>
Classes</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WValidator_1_1Result.html">Result</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">A class that holds a validation result. <a href="classWt_1_1WValidator_1_1Result.html#details">More...</a><br/></td></tr>
<tr><td colspan="2"><h2><a name="pub-types"></a>
Public Types</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">enum  </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WValidator.html#a638a1feefca259ea2f806a8add2d18a3">State</a> { <a class="el" href="classWt_1_1WValidator.html#a638a1feefca259ea2f806a8add2d18a3aa5bf750faac5f1ca6fb58c8de97bac51">Invalid</a>,
<a class="el" href="classWt_1_1WValidator.html#a638a1feefca259ea2f806a8add2d18a3a5e6ab5b841b3066a2d228b9ce7f4f447">InvalidEmpty</a>,
<a class="el" href="classWt_1_1WValidator.html#a638a1feefca259ea2f806a8add2d18a3a1bc2acb7589ab9e3050867ebfc32dda3">Valid</a>
}</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">The state in which validated input can exist. <a href="classWt_1_1WValidator.html#a638a1feefca259ea2f806a8add2d18a3">More...</a><br/></td></tr>
<tr><td colspan="2"><h2><a name="pub-methods"></a>
Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a81e355ed7c38c9e5de934d3994b3905c"></a><!-- doxytag: member="Wt::WValidator::WValidator" ref="a81e355ed7c38c9e5de934d3994b3905c" args="(WObject *parent=0)" -->
 </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WValidator.html#a81e355ed7c38c9e5de934d3994b3905c">WValidator</a> (<a class="el" href="classWt_1_1WObject.html">WObject</a> *parent=0)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Creates a new validator. <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WValidator.html#a4c4a0b7bcb4c543812b1500c748ab99b">WValidator</a> (bool mandatory, <a class="el" href="classWt_1_1WObject.html">WObject</a> *parent=0)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Creates a new validator. <a href="#a4c4a0b7bcb4c543812b1500c748ab99b"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WValidator.html#ad7f5599879175c310dac4b76331d7ff6">~WValidator</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Destructor. <a href="#ad7f5599879175c310dac4b76331d7ff6"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WValidator.html#a6f7993c51a0088b927d7c9aa516efabb">setMandatory</a> (bool how)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Sets if input is mandatory. <a href="#a6f7993c51a0088b927d7c9aa516efabb"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a8de913a10b24231264de5cc082c0d2fd"></a><!-- doxytag: member="Wt::WValidator::isMandatory" ref="a8de913a10b24231264de5cc082c0d2fd" args="() const " -->
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WValidator.html#a8de913a10b24231264de5cc082c0d2fd">isMandatory</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns if input is mandatory. <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WValidator.html#abafa7c49159d5475a8ec6eff1fef8c17">setInvalidBlankText</a> (const <a class="el" href="classWt_1_1WString.html">WString</a> &text)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Sets the message to display when a mandatory field is left blank. <a href="#abafa7c49159d5475a8ec6eff1fef8c17"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="classWt_1_1WString.html">WString</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WValidator.html#a3518bfa063c9155c99e5ca3990465d35">invalidBlankText</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns the message displayed when a mandatory field is left blank. <a href="#a3518bfa063c9155c99e5ca3990465d35"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WValidator.html#a8766794c9600455d35cafb1bd9af1eb9">fixup</a> (<a class="el" href="classWt_1_1WString.html">WString</a> &input) const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">This function attempts to change input to be valid according to the validator's rules. <a href="#a8766794c9600455d35cafb1bd9af1eb9"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual <a class="el" href="classWt_1_1WValidator_1_1Result.html">Result</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WValidator.html#a78808215d68944dedca11ff8889374ed">validate</a> (const <a class="el" href="classWt_1_1WString.html">WString</a> &input) const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Validates the given input. <a href="#a78808215d68944dedca11ff8889374ed"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="acabfaf05f2346019f3f18f6c299bb384"></a><!-- doxytag: member="Wt::WValidator::createExtConfig" ref="acabfaf05f2346019f3f18f6c299bb384" args="(std::ostream &config) const " -->
virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WValidator.html#acabfaf05f2346019f3f18f6c299bb384">createExtConfig</a> (std::ostream &config) const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Provides Ext-compatible config options for client-side validation. <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual std::string </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WValidator.html#a2aca1c34abaf4a35b972c3cf82ce1e48">javaScriptValidate</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Creates a Javascript object that validates the input. <a href="#a2aca1c34abaf4a35b972c3cf82ce1e48"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual std::string </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WValidator.html#a1ca29b7eaabf4c1655200ec382a84554">inputFilter</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns a regular expression that filters input. <a href="#a1ca29b7eaabf4c1655200ec382a84554"></a><br/></td></tr>
</table>
<hr/><a name="details" id="details"></a><h2>Detailed Description</h2>
<div class="textblock"><p>A validator is used to validate user input according to pre-defined rules. </p>
<p>A validator may be associated with a form widget using <a class="el" href="classWt_1_1WFormWidget.html#aa773d16013d6959149ce5081e84b259c" title="Sets a validator for this field.">WFormWidget::setValidator()</a>.</p>
<p>The validator validates the user input. A validator may have a split implementation to provide both validation at the client-side (which gives instant feed-back to the user while editing), and server-side validation (to be sure that the client was not tampered with). The feed-back given by (client-side and server-side) validation is reflected in the style class of the form field: a style class of <code>Wt-invalid</code> is set for a field that is invalid.</p>
<p>This WValidator only checks that mandatory fields are not empty. This class is reimplemented in <a class="el" href="classWt_1_1WDateValidator.html" title="A validator for date input.">WDateValidator</a>, <a class="el" href="classWt_1_1WIntValidator.html" title="A validator that validates integer user input.">WIntValidator</a>, <a class="el" href="classWt_1_1WDoubleValidator.html" title="A validator for validating floating point user input.">WDoubleValidator</a>, <a class="el" href="classWt_1_1WLengthValidator.html" title="A validator that checks the string length of user input.">WLengthValidator</a> and <a class="el" href="classWt_1_1WRegExpValidator.html" title="A validator that checks user input against a regular expression.">WRegExpValidator</a>. All these validators provibe both client-side and server-side validation.</p>
<p>If these validators are not suitable, you can inherit from this class, and provide a suitable implementation to <a class="el" href="classWt_1_1WValidator.html#a78808215d68944dedca11ff8889374ed" title="Validates the given input.">validate()</a> which does the server-side validation. If you want to provide client-side validation for your own validator, you may also reimplement <a class="el" href="classWt_1_1WValidator.html#a2aca1c34abaf4a35b972c3cf82ce1e48" title="Creates a Javascript object that validates the input.">javaScriptValidate()</a>.</p>
<h3>i18n</h3>
<p>The strings used in this class can be translated by overriding the default values for the following localization keys:</p>
<ul>
<li><a class="el" href="classWt_1_1WValidator.html#a638a1feefca259ea2f806a8add2d18a3aa5bf750faac5f1ca6fb58c8de97bac51" title="The input is invalid.">Wt.WValidator.Invalid</a>: This field cannot be empty</li>
</ul>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WFormWidget.html" title="An abstract widget that corresponds to an HTML form element.">WFormWidget</a> </dd></dl>
</div><hr/><h2>Member Enumeration Documentation</h2>
<a class="anchor" id="a638a1feefca259ea2f806a8add2d18a3"></a><!-- doxytag: member="Wt::WValidator::State" ref="a638a1feefca259ea2f806a8add2d18a3" args="" -->
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<td class="memname">enum <a class="el" href="classWt_1_1WValidator.html#a638a1feefca259ea2f806a8add2d18a3">Wt::WValidator::State</a></td>
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<p>The state in which validated input can exist. </p>
<dl><dt><b>Enumerator: </b></dt><dd><table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"><em><a class="anchor" id="a638a1feefca259ea2f806a8add2d18a3aa5bf750faac5f1ca6fb58c8de97bac51"></a><!-- doxytag: member="Invalid" ref="a638a1feefca259ea2f806a8add2d18a3aa5bf750faac5f1ca6fb58c8de97bac51" args="" -->Invalid</em> </td><td>
<p>The input is invalid. </p>
</td></tr>
<tr><td valign="top"><em><a class="anchor" id="a638a1feefca259ea2f806a8add2d18a3a5e6ab5b841b3066a2d228b9ce7f4f447"></a><!-- doxytag: member="InvalidEmpty" ref="a638a1feefca259ea2f806a8add2d18a3a5e6ab5b841b3066a2d228b9ce7f4f447" args="" -->InvalidEmpty</em> </td><td>
<p>The input is invalid (empty and mandatory). </p>
</td></tr>
<tr><td valign="top"><em><a class="anchor" id="a638a1feefca259ea2f806a8add2d18a3a1bc2acb7589ab9e3050867ebfc32dda3"></a><!-- doxytag: member="Valid" ref="a638a1feefca259ea2f806a8add2d18a3a1bc2acb7589ab9e3050867ebfc32dda3" args="" -->Valid</em> </td><td>
<p>The input is valid. </p>
</td></tr>
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</dd>
</dl>
</div>
</div>
<hr/><h2>Constructor & Destructor Documentation</h2>
<a class="anchor" id="a4c4a0b7bcb4c543812b1500c748ab99b"></a><!-- doxytag: member="Wt::WValidator::WValidator" ref="a4c4a0b7bcb4c543812b1500c748ab99b" args="(bool mandatory, WObject *parent=0)" -->
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<td class="memname">Wt::WValidator::WValidator </td>
<td>(</td>
<td class="paramtype">bool </td>
<td class="paramname"><em>mandatory</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="classWt_1_1WObject.html">WObject</a> * </td>
<td class="paramname"><em>parent</em> = <code>0</code> </td>
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<td>)</td>
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<p>Creates a new validator. </p>
<p>Indicate whether input is mandatory.</p>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WValidator.html#a6f7993c51a0088b927d7c9aa516efabb" title="Sets if input is mandatory.">setMandatory(bool)</a> </dd></dl>
</div>
</div>
<a class="anchor" id="ad7f5599879175c310dac4b76331d7ff6"></a><!-- doxytag: member="Wt::WValidator::~WValidator" ref="ad7f5599879175c310dac4b76331d7ff6" args="()" -->
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<td class="memname">Wt::WValidator::~WValidator </td>
<td>(</td>
<td class="paramname"></td><td>)</td>
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<p>Destructor. </p>
<p>The validator automatically removes itself from all formfields to which it was associated. </p>
</div>
</div>
<hr/><h2>Member Function Documentation</h2>
<a class="anchor" id="a8766794c9600455d35cafb1bd9af1eb9"></a><!-- doxytag: member="Wt::WValidator::fixup" ref="a8766794c9600455d35cafb1bd9af1eb9" args="(WString &input) const " -->
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<td class="memname">void Wt::WValidator::fixup </td>
<td>(</td>
<td class="paramtype"><a class="el" href="classWt_1_1WString.html">WString</a> & </td>
<td class="paramname"><em>input</em></td><td>)</td>
<td> const<code> [virtual]</code></td>
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<p>This function attempts to change input to be valid according to the validator's rules. </p>
<p>In general the function needs not to change the input into a valid input. The default implementation does nothing. But it may help the user in getting its input right. </p>
</div>
</div>
<a class="anchor" id="a1ca29b7eaabf4c1655200ec382a84554"></a><!-- doxytag: member="Wt::WValidator::inputFilter" ref="a1ca29b7eaabf4c1655200ec382a84554" args="() const " -->
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<td class="memname">std::string Wt::WValidator::inputFilter </td>
<td>(</td>
<td class="paramname"></td><td>)</td>
<td> const<code> [virtual]</code></td>
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<p>Returns a regular expression that filters input. </p>
<p>The returned regular expression is used to filter keys presses. The regular expression should accept valid single characters.</p>
<p>For details on valid regular expressions, see <a class="el" href="classWt_1_1WRegExpValidator.html" title="A validator that checks user input against a regular expression.">WRegExpValidator</a>. As an example, "[0-9]" would only accept numbers as valid input.</p>
<p>The default implementation returns an empty string, which does not filter any input.</p>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WValidator.html#a2aca1c34abaf4a35b972c3cf82ce1e48" title="Creates a Javascript object that validates the input.">javaScriptValidate()</a> </dd></dl>
<p>Reimplemented in <a class="el" href="classWt_1_1WIntValidator.html#aaa26351e1a00502da10a9d67a7eea817">Wt::WIntValidator</a>.</p>
</div>
</div>
<a class="anchor" id="a3518bfa063c9155c99e5ca3990465d35"></a><!-- doxytag: member="Wt::WValidator::invalidBlankText" ref="a3518bfa063c9155c99e5ca3990465d35" args="() const " -->
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<td class="memname"><a class="el" href="classWt_1_1WString.html">WString</a> Wt::WValidator::invalidBlankText </td>
<td>(</td>
<td class="paramname"></td><td>)</td>
<td> const</td>
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<p>Returns the message displayed when a mandatory field is left blank. </p>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WValidator.html#abafa7c49159d5475a8ec6eff1fef8c17" title="Sets the message to display when a mandatory field is left blank.">setInvalidBlankText(const WString&)</a> </dd></dl>
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<a class="anchor" id="a2aca1c34abaf4a35b972c3cf82ce1e48"></a><!-- doxytag: member="Wt::WValidator::javaScriptValidate" ref="a2aca1c34abaf4a35b972c3cf82ce1e48" args="() const " -->
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<td class="memname">std::string Wt::WValidator::javaScriptValidate </td>
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<td class="paramname"></td><td>)</td>
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<p>Creates a Javascript object that validates the input. </p>
<p>The JavaScript expression should evaluate to an object which contains a <code>validate(text)</code> function, which returns an object that contains the following two fields:</p>
<ul>
<li>fields: a boolean <em>valid</em>,</li>
<li>a <code>message</code> that indicates the problem if not valid.</li>
</ul>
<p>Returns an empty string if the validator does not provide a client-side validation implementationq.</p>
<dl class="note"><dt><b>Note:</b></dt><dd>The signature and contract changed changed in Wt 3.1.9.</dd></dl>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WValidator.html#a1ca29b7eaabf4c1655200ec382a84554" title="Returns a regular expression that filters input.">inputFilter()</a> </dd></dl>
<p>Reimplemented in <a class="el" href="classWt_1_1WDateValidator.html#af86a4342d89d6635ab62bb189bdaf9f6">Wt::WDateValidator</a>, <a class="el" href="classWt_1_1WDoubleValidator.html#aed2cd8b4dab3144c567a91a2a6c79011">Wt::WDoubleValidator</a>, <a class="el" href="classWt_1_1WIntValidator.html#a4e2ca08428ae3bdd22dca2d6b48b6cba">Wt::WIntValidator</a>, <a class="el" href="classWt_1_1WRegExpValidator.html#a436a5203db23b5d67eb83d5f3d3232d2">Wt::WRegExpValidator</a>, and <a class="el" href="classWt_1_1WLengthValidator.html#ad146808a017f57c23b0cec6d1126f145">Wt::WLengthValidator</a>.</p>
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<a class="anchor" id="abafa7c49159d5475a8ec6eff1fef8c17"></a><!-- doxytag: member="Wt::WValidator::setInvalidBlankText" ref="abafa7c49159d5475a8ec6eff1fef8c17" args="(const WString &text)" -->
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<td class="memname">void Wt::WValidator::setInvalidBlankText </td>
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<td class="paramtype">const <a class="el" href="classWt_1_1WString.html">WString</a> & </td>
<td class="paramname"><em>text</em></td><td>)</td>
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<p>Sets the message to display when a mandatory field is left blank. </p>
<p>The default value is "This field cannot be empty". </p>
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<a class="anchor" id="a6f7993c51a0088b927d7c9aa516efabb"></a><!-- doxytag: member="Wt::WValidator::setMandatory" ref="a6f7993c51a0088b927d7c9aa516efabb" args="(bool how)" -->
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<td class="memname">void Wt::WValidator::setMandatory </td>
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<td class="paramtype">bool </td>
<td class="paramname"><em>how</em></td><td>)</td>
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<p>Sets if input is mandatory. </p>
<p>When an input is not mandatory, then an empty field is always valid. </p>
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<a class="anchor" id="a78808215d68944dedca11ff8889374ed"></a><!-- doxytag: member="Wt::WValidator::validate" ref="a78808215d68944dedca11ff8889374ed" args="(const WString &input) const " -->
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<td class="memname"><a class="el" href="classWt_1_1WValidator_1_1Result.html">WValidator::Result</a> Wt::WValidator::validate </td>
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<td class="paramname"><em>input</em></td><td>)</td>
<td> const<code> [virtual]</code></td>
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<p>Validates the given input. </p>
<dl class="note"><dt><b>Note:</b></dt><dd>The signature for this method changed in Wt 3.2.0. </dd></dl>
<p>Reimplemented in <a class="el" href="classWt_1_1Auth_1_1AbstractPasswordService_1_1AbstractStrengthValidator.html#a20fc36e693a20f6b3f89ac334c0b7470">Wt::Auth::AbstractPasswordService::AbstractStrengthValidator</a>, <a class="el" href="classWt_1_1WDateValidator.html#ab5dc124f7168757630dfc3b27376ed4d">Wt::WDateValidator</a>, <a class="el" href="classWt_1_1WRegExpValidator.html#a48e12373f8cf76d7e1dfaa2b6f74bea0">Wt::WRegExpValidator</a>, <a class="el" href="classWt_1_1WLengthValidator.html#a7037c50a29792374b729385d134b906e">Wt::WLengthValidator</a>, <a class="el" href="classWt_1_1WDoubleValidator.html#a83572a7226b8c6a09b88d7b7ec17fcef">Wt::WDoubleValidator</a>, and <a class="el" href="classWt_1_1WIntValidator.html#a2598908928e111bc1717a394bfc31fc7">Wt::WIntValidator</a>.</p>
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