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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<h1>Wt::WValidator Class Reference</h1><!-- doxytag: class="Wt::WValidator" --><!-- doxytag: inherits="Wt::WObject" -->A validator is used to validate user input according to pre-defined rules.
<a href="#_details">More...</a>
<p>
<code>#include <Wt/WValidator></code>
<p>
<div class="dynheader">
Inheritance diagram for Wt::WValidator:</div>
<div class="dynsection">
<p><center><img src="classWt_1_1WValidator__inherit__graph.png" border="0" usemap="#Wt_1_1WValidator__inherit__map" alt="Inheritance graph"></center>
<map name="Wt_1_1WValidator__inherit__map">
<area shape="rect" href="classWt_1_1WDateValidator.html" title="A validator for date input." alt="" coords="317,5,451,32"><area shape="rect" href="classWt_1_1WDoubleValidator.html" title="A validator for validating floating point user input." alt="" coords="311,56,457,83"><area shape="rect" href="classWt_1_1WIntValidator.html" title="A validator that validates integer user input." alt="" coords="323,107,445,133"><area shape="rect" href="classWt_1_1WLengthValidator.html" title="A validator that checks the string length of user input." alt="" coords="311,157,457,184"><area shape="rect" href="classWt_1_1WRegExpValidator.html" title="A validator that checks user input against a regular expression." alt="" coords="308,208,460,235"><area shape="rect" href="classWt_1_1WObject.html" title="A base class for objects that participate in the signal/slot system." alt="" coords="5,107,101,133"></map>
<center><font size="2">[<a href="graph_legend.html">legend</a>]</font></center></div>
<p>
<a href="classWt_1_1WValidator-members.html">List of all members.</a><table border="0" cellpadding="0" cellspacing="0">
<tr><td></td></tr>
<tr><td colspan="2"><br><h2>Public Types</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">enum </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WValidator.html#638a1feefca259ea2f806a8add2d18a3">State</a> { <a class="el" href="classWt_1_1WValidator.html#638a1feefca259ea2f806a8add2d18a3a5bf750faac5f1ca6fb58c8de97bac51">Invalid</a>,
<a class="el" href="classWt_1_1WValidator.html#638a1feefca259ea2f806a8add2d18a35e6ab5b841b3066a2d228b9ce7f4f447">InvalidEmpty</a>,
<a class="el" href="classWt_1_1WValidator.html#638a1feefca259ea2f806a8add2d18a31bc2acb7589ab9e3050867ebfc32dda3">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#638a1feefca259ea2f806a8add2d18a3">More...</a><br></td></tr>
<tr><td colspan="2"><br><h2>Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="81e355ed7c38c9e5de934d3994b3905c"></a><!-- doxytag: member="Wt::WValidator::WValidator" ref="81e355ed7c38c9e5de934d3994b3905c" args="(WObject *parent=0)" -->
</td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WValidator.html#81e355ed7c38c9e5de934d3994b3905c">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" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WValidator.html#4c4a0b7bcb4c543812b1500c748ab99b">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="#4c4a0b7bcb4c543812b1500c748ab99b"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WValidator.html#d7f5599879175c310dac4b76331d7ff6">~WValidator</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Destructor. <a href="#d7f5599879175c310dac4b76331d7ff6"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WValidator.html#6f7993c51a0088b927d7c9aa516efabb">setMandatory</a> (bool how)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Sets if input is mandatory. <a href="#6f7993c51a0088b927d7c9aa516efabb"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="8de913a10b24231264de5cc082c0d2fd"></a><!-- doxytag: member="Wt::WValidator::isMandatory" ref="8de913a10b24231264de5cc082c0d2fd" args="() const " -->
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WValidator.html#8de913a10b24231264de5cc082c0d2fd">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" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WValidator.html#bafa7c49159d5475a8ec6eff1fef8c17">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="#bafa7c49159d5475a8ec6eff1fef8c17"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap 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#3518bfa063c9155c99e5ca3990465d35">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="#3518bfa063c9155c99e5ca3990465d35"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WValidator.html#8766794c9600455d35cafb1bd9af1eb9">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="#8766794c9600455d35cafb1bd9af1eb9"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual <a class="el" href="classWt_1_1WValidator.html#638a1feefca259ea2f806a8add2d18a3">State</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WValidator.html#fce53cf7c8fa1692234df0538163b4e0">validate</a> (<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="#fce53cf7c8fa1692234df0538163b4e0"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="cabfaf05f2346019f3f18f6c299bb384"></a><!-- doxytag: member="Wt::WValidator::createExtConfig" ref="cabfaf05f2346019f3f18f6c299bb384" args="(std::ostream &config) const " -->
virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WValidator.html#cabfaf05f2346019f3f18f6c299bb384">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 colspan="2"><br><h2>Protected Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual std::string </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WValidator.html#5141a6c178329e6d26faad71e7bf26aa">javaScriptValidate</a> (const std::string &jsRef) const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Creates a Javascript expression that validates the input. <a href="#5141a6c178329e6d26faad71e7bf26aa"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual std::string </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WValidator.html#1ca29b7eaabf4c1655200ec382a84554">inputFilter</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns a regular expression that filters input. <a href="#1ca29b7eaabf4c1655200ec382a84554"></a><br></td></tr>
</table>
<hr><a name="_details"></a><h2>Detailed Description</h2>
A validator is used to validate user input according to pre-defined rules.
<p>
A validator may be associated with a form widget using <a class="el" href="classWt_1_1WFormWidget.html#a773d16013d6959149ce5081e84b259c" title="Sets a validator for this field.">WFormWidget::setValidator()</a>.<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>
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>
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#fce53cf7c8fa1692234df0538163b4e0" 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#5141a6c178329e6d26faad71e7bf26aa" title="Creates a Javascript expression that validates the input.">javaScriptValidate()</a>.<p>
<dl class="see" compact><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>
<hr><h2>Member Enumeration Documentation</h2>
<a class="anchor" name="638a1feefca259ea2f806a8add2d18a3"></a><!-- doxytag: member="Wt::WValidator::State" ref="638a1feefca259ea2f806a8add2d18a3" args="" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
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<td class="memname">enum <a class="el" href="classWt_1_1WValidator.html#638a1feefca259ea2f806a8add2d18a3">Wt::WValidator::State</a> </td>
</tr>
</table>
</div>
<div class="memdoc">
<p>
The state in which validated input can exist.
<p>
<dl compact><dt><b>Enumerator: </b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"><em><a class="anchor" name="638a1feefca259ea2f806a8add2d18a3a5bf750faac5f1ca6fb58c8de97bac51"></a><!-- doxytag: member="Invalid" ref="638a1feefca259ea2f806a8add2d18a3a5bf750faac5f1ca6fb58c8de97bac51" args="" -->Invalid</em> </td><td>
The input is invalid. </td></tr>
<tr><td valign="top"><em><a class="anchor" name="638a1feefca259ea2f806a8add2d18a35e6ab5b841b3066a2d228b9ce7f4f447"></a><!-- doxytag: member="InvalidEmpty" ref="638a1feefca259ea2f806a8add2d18a35e6ab5b841b3066a2d228b9ce7f4f447" args="" -->InvalidEmpty</em> </td><td>
The input is invalid (emtpy and mandatory). </td></tr>
<tr><td valign="top"><em><a class="anchor" name="638a1feefca259ea2f806a8add2d18a31bc2acb7589ab9e3050867ebfc32dda3"></a><!-- doxytag: member="Valid" ref="638a1feefca259ea2f806a8add2d18a31bc2acb7589ab9e3050867ebfc32dda3" args="" -->Valid</em> </td><td>
The input is valid. </td></tr>
</table>
</dl>
</div>
</div><p>
<hr><h2>Constructor & Destructor Documentation</h2>
<a class="anchor" name="4c4a0b7bcb4c543812b1500c748ab99b"></a><!-- doxytag: member="Wt::WValidator::WValidator" ref="4c4a0b7bcb4c543812b1500c748ab99b" args="(bool mandatory, WObject *parent=0)" -->
<div class="memitem">
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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>
</tr>
<tr>
<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><td> </td>
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<td></td>
<td>)</td>
<td></td><td></td><td></td>
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<div class="memdoc">
<p>
Creates a new validator.
<p>
Indicate whether input is mandatory.<p>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WValidator.html#6f7993c51a0088b927d7c9aa516efabb" title="Sets if input is mandatory.">setMandatory(bool)</a> </dd></dl>
</div>
</div><p>
<a class="anchor" name="d7f5599879175c310dac4b76331d7ff6"></a><!-- doxytag: member="Wt::WValidator::~WValidator" ref="d7f5599879175c310dac4b76331d7ff6" args="()" -->
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<td class="memname">Wt::WValidator::~WValidator </td>
<td>(</td>
<td class="paramname"> </td>
<td> ) </td>
<td></td>
</tr>
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<div class="memdoc">
<p>
Destructor.
<p>
The validator automatically removes itself from all formfields to which it was associated.
</div>
</div><p>
<hr><h2>Member Function Documentation</h2>
<a class="anchor" name="6f7993c51a0088b927d7c9aa516efabb"></a><!-- doxytag: member="Wt::WValidator::setMandatory" ref="6f7993c51a0088b927d7c9aa516efabb" args="(bool how)" -->
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<td class="memname">void Wt::WValidator::setMandatory </td>
<td>(</td>
<td class="paramtype">bool </td>
<td class="paramname"> <em>how</em> </td>
<td> ) </td>
<td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>
Sets if input is mandatory.
<p>
When an input is not mandatory, then an empty field is always valid.
</div>
</div><p>
<a class="anchor" name="bafa7c49159d5475a8ec6eff1fef8c17"></a><!-- doxytag: member="Wt::WValidator::setInvalidBlankText" ref="bafa7c49159d5475a8ec6eff1fef8c17" args="(const WString &text)" -->
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<td class="memname">void Wt::WValidator::setInvalidBlankText </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="classWt_1_1WString.html">WString</a> & </td>
<td class="paramname"> <em>text</em> </td>
<td> ) </td>
<td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>
Sets the message to display when a mandatory field is left blank.
<p>
The default value is "This field cannot be empty".
</div>
</div><p>
<a class="anchor" name="3518bfa063c9155c99e5ca3990465d35"></a><!-- doxytag: member="Wt::WValidator::invalidBlankText" ref="3518bfa063c9155c99e5ca3990465d35" 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" compact><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WValidator.html#bafa7c49159d5475a8ec6eff1fef8c17" title="Sets the message to display when a mandatory field is left blank.">setInvalidBlankText(const WString&)</a> </dd></dl>
</div>
</div><p>
<a class="anchor" name="8766794c9600455d35cafb1bd9af1eb9"></a><!-- doxytag: member="Wt::WValidator::fixup" ref="8766794c9600455d35cafb1bd9af1eb9" 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>
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.
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<a class="anchor" name="fce53cf7c8fa1692234df0538163b4e0"></a><!-- doxytag: member="Wt::WValidator::validate" ref="fce53cf7c8fa1692234df0538163b4e0" args="(WString &input) const " -->
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<td class="memname"><a class="el" href="classWt_1_1WValidator.html#638a1feefca259ea2f806a8add2d18a3">WValidator::State</a> Wt::WValidator::validate </td>
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<td class="paramtype"><a class="el" href="classWt_1_1WString.html">WString</a> & </td>
<td class="paramname"> <em>input</em> </td>
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Validates the given input.
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This function returns the current validation state of the input. The default implementation only checks whether a mandatory field is not left blank.
<p>Reimplemented in <a class="el" href="classWt_1_1WDateValidator.html#fa833f63a53d7d13aecdf2f79dab75d9">Wt::WDateValidator</a>, <a class="el" href="classWt_1_1WDoubleValidator.html#66e68bb1d7f9698f3d515b1de884a33a">Wt::WDoubleValidator</a>, <a class="el" href="classWt_1_1WIntValidator.html#15807b522c601992d5275a729ed69285">Wt::WIntValidator</a>, <a class="el" href="classWt_1_1WLengthValidator.html#de2cb48af62ad35c7d7e50155fbf0e45">Wt::WLengthValidator</a>, and <a class="el" href="classWt_1_1WRegExpValidator.html#cd0bc1ff9dc23f4f34c6840e3d0d5edc">Wt::WRegExpValidator</a>.</p>
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<a class="anchor" name="5141a6c178329e6d26faad71e7bf26aa"></a><!-- doxytag: member="Wt::WValidator::javaScriptValidate" ref="5141a6c178329e6d26faad71e7bf26aa" args="(const std::string &jsRef) const " -->
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<td class="memname">std::string Wt::WValidator::javaScriptValidate </td>
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Creates a Javascript expression that validates the input.
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The JavaScript expression should evaluate to an object with two fields: a boolean <em>valid</em>, and a <code>message</code> that indicates the problem if not valid.<p>
Return an empty string if you are not provide the client-side validation.<p>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WValidator.html#1ca29b7eaabf4c1655200ec382a84554" title="Returns a regular expression that filters input.">inputFilter()</a> </dd></dl>
<p>Reimplemented in <a class="el" href="classWt_1_1WDateValidator.html#de82d221d04556f2d219d1b9b80bce45">Wt::WDateValidator</a>, <a class="el" href="classWt_1_1WDoubleValidator.html#590267f8600a399b07133da5cec299b4">Wt::WDoubleValidator</a>, <a class="el" href="classWt_1_1WIntValidator.html#61217a65efb5d2e06262e3710224ea46">Wt::WIntValidator</a>, <a class="el" href="classWt_1_1WLengthValidator.html#2e8143bc9dedb9d4f7f77f3048bf5ff9">Wt::WLengthValidator</a>, and <a class="el" href="classWt_1_1WRegExpValidator.html#ae5e8bce20a76f654cd007b8b85cba0d">Wt::WRegExpValidator</a>.</p>
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<a class="anchor" name="1ca29b7eaabf4c1655200ec382a84554"></a><!-- doxytag: member="Wt::WValidator::inputFilter" ref="1ca29b7eaabf4c1655200ec382a84554" args="() const " -->
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<td class="memname">std::string Wt::WValidator::inputFilter </td>
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Returns a regular expression that filters input.
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The returned regular expression is used to filter keys presses. The regular expression should accept valid single characters.<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>
The default implementation returns an empty string, which does not filter any input.<p>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WValidator.html#5141a6c178329e6d26faad71e7bf26aa" title="Creates a Javascript expression that validates the input.">javaScriptValidate()</a> </dd></dl>
<p>Reimplemented in <a class="el" href="classWt_1_1WIntValidator.html#aa26351e1a00502da10a9d67a7eea817">Wt::WIntValidator</a>.</p>
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