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<!-- doxytag: class="Wt::WLengthValidator" --><!-- doxytag: inherits="Wt::WValidator" -->
<p>A validator that checks the string length of user input.
<a href="classWt_1_1WLengthValidator.html#details">More...</a></p>
<p><code>#include <Wt/WLengthValidator></code></p>
<div class="dynheader">
Inheritance diagram for Wt::WLengthValidator:</div>
<div class="dyncontent">
<div class="center"><img src="classWt_1_1WLengthValidator__inherit__graph.png" border="0" usemap="#Wt_1_1WLengthValidator_inherit__map" alt="Inheritance graph"/></div>
<map name="Wt_1_1WLengthValidator_inherit__map" id="Wt_1_1WLengthValidator_inherit__map">
<area shape="rect" href="classWt_1_1WValidator.html" title="A validator is used to validate user input according to pre-defined rules." alt="" coords="24,80,133,107"/><area shape="rect" href="classWt_1_1WObject.html" title="A base class for objects that participate in the signal/slot system." alt="" coords="31,5,127,32"/></map>
<center><span class="legend">[<a href="graph_legend.html">legend</a>]</span></center></div>
<p><a href="classWt_1_1WLengthValidator-members.html">List of all members.</a></p>
<table class="memberdecls">
<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="ad6ced22261c4dd0f249011a872c1ecbe"></a><!-- doxytag: member="Wt::WLengthValidator::WLengthValidator" ref="ad6ced22261c4dd0f249011a872c1ecbe" args="(WObject *parent=0)" -->
 </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WLengthValidator.html#ad6ced22261c4dd0f249011a872c1ecbe">WLengthValidator</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 length validator that accepts input of any length. <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="aee3614e5244c8bdbd226a781e014d82d"></a><!-- doxytag: member="Wt::WLengthValidator::WLengthValidator" ref="aee3614e5244c8bdbd226a781e014d82d" args="(int minLength, int maxLength, WObject *parent=0)" -->
 </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WLengthValidator.html#aee3614e5244c8bdbd226a781e014d82d">WLengthValidator</a> (int minLength, int maxLength, <a class="el" href="classWt_1_1WObject.html">WObject</a> *parent=0)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Creates a length validator that accepts input within a length range. <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WLengthValidator.html#a6a772dfac01805c714374fd290ff6e6d">setMinimumLength</a> (int minimum)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Sets the minimum length. <a href="#a6a772dfac01805c714374fd290ff6e6d"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WLengthValidator.html#a68dede1a5faa6d83f9347d8dde68f6d1">minimumLength</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns the minimum length. <a href="#a68dede1a5faa6d83f9347d8dde68f6d1"></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_1WLengthValidator.html#a1f1742e015228319a10dd42a38ef79f4">setMaximumLength</a> (int maximum)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Sets the maximum length. <a href="#a1f1742e015228319a10dd42a38ef79f4"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WLengthValidator.html#a829f8c83606ed31a982e99fcd63b15fc">maximumLength</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns the maximum length. <a href="#a829f8c83606ed31a982e99fcd63b15fc"></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_1WLengthValidator.html#a7037c50a29792374b729385d134b906e">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="#a7037c50a29792374b729385d134b906e"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a398750e14a071a4a7aff0d46d2266aaf"></a><!-- doxytag: member="Wt::WLengthValidator::createExtConfig" ref="a398750e14a071a4a7aff0d46d2266aaf" args="(std::ostream &config) const " -->
virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WLengthValidator.html#a398750e14a071a4a7aff0d46d2266aaf">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">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WLengthValidator.html#a61299b45c89e93a8d7aa7f2570242286">setInvalidTooShortText</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 the input is too short. <a href="#a61299b45c89e93a8d7aa7f2570242286"></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_1WLengthValidator.html#a39f2dd4516c2b53c84343d5adfe2f384">invalidTooShortText</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns the message displayed when the input is too short. <a href="#a39f2dd4516c2b53c84343d5adfe2f384"></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_1WLengthValidator.html#aa24dd0a946f937e0dde081003bf30fec">setInvalidTooLongText</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 the input is too long. <a href="#aa24dd0a946f937e0dde081003bf30fec"></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_1WLengthValidator.html#a5ba8fb18ad613678b7f744b05dda55cc">invalidTooLongText</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns the message displayed when the input is too long. <a href="#a5ba8fb18ad613678b7f744b05dda55cc"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">std::string </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WLengthValidator.html#ad146808a017f57c23b0cec6d1126f145">javaScriptValidate</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Creates a Javascript object that validates the input. <a href="#ad146808a017f57c23b0cec6d1126f145"></a><br/></td></tr>
</table>
<hr/><a name="details" id="details"></a><h2>Detailed Description</h2>
<div class="textblock"><p>A validator that checks the string length of user input. </p>
<p>This validator checks whether user input is within the specified range of accepted string lengths.</p>
<p>If you only want to limit the length on a line edit, you may also use <a class="el" href="classWt_1_1WLineEdit.html#aaeca334d8a47be029b6a44912b01ed5d" title="Specifies the maximum length of text that can be entered.">WLineEdit::setMaxLength()</a>.</p>
<p>Usage example: </p>
<div class="fragment"><pre class="fragment"> <a class="code" href="classWt_1_1WLineEdit.html" title="A widget that provides a single line edit.">Wt::WLineEdit</a> *lineEdit = <span class="keyword">new</span> <a class="code" href="classWt_1_1WLineEdit.html" title="A widget that provides a single line edit.">Wt::WLineEdit</a>(<span class="keyword">this</span>);
<a class="code" href="classWt_1_1WLengthValidator.html" title="A validator that checks the string length of user input.">Wt::WLengthValidator</a> *validator = <span class="keyword">new</span> <a class="code" href="classWt_1_1WLengthValidator.html#ad6ced22261c4dd0f249011a872c1ecbe" title="Creates a length validator that accepts input of any length.">Wt::WLengthValidator</a>(5, 15);
lineEdit-><a class="code" href="classWt_1_1WFormWidget.html#aa773d16013d6959149ce5081e84b259c" title="Sets a validator for this field.">setValidator</a>(validator);
lineEdit-><a class="code" href="classWt_1_1WLineEdit.html#addb99c6ab5483836adf44a2706a410af" title="Sets the content of the line edit.">setText</a>(<span class="stringliteral">"abcdef"</span>);
</pre></div><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>Wt.WLengthValidator.TooShort: The input must be at least {1} characters</li>
<li>Wt.WLengthValidator.BadRange: The input must have a length between {1} and {2} characters</li>
<li>Wt.WLengthValidator.TooLong: The input must be no more than {1} characters </li>
</ul>
</div><hr/><h2>Member Function Documentation</h2>
<a class="anchor" id="a5ba8fb18ad613678b7f744b05dda55cc"></a><!-- doxytag: member="Wt::WLengthValidator::invalidTooLongText" ref="a5ba8fb18ad613678b7f744b05dda55cc" args="() const " -->
<div class="memitem">
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<td class="memname"><a class="el" href="classWt_1_1WString.html">WString</a> Wt::WLengthValidator::invalidTooLongText </td>
<td>(</td>
<td class="paramname"></td><td>)</td>
<td> const</td>
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<div class="memdoc">
<p>Returns the message displayed when the input is too long. </p>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WLengthValidator.html#aa24dd0a946f937e0dde081003bf30fec" title="Sets the message to display when the input is too long.">setInvalidTooLongText(const WString&)</a> </dd></dl>
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</div>
<a class="anchor" id="a39f2dd4516c2b53c84343d5adfe2f384"></a><!-- doxytag: member="Wt::WLengthValidator::invalidTooShortText" ref="a39f2dd4516c2b53c84343d5adfe2f384" args="() const " -->
<div class="memitem">
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<td class="memname"><a class="el" href="classWt_1_1WString.html">WString</a> Wt::WLengthValidator::invalidTooShortText </td>
<td>(</td>
<td class="paramname"></td><td>)</td>
<td> const</td>
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<div class="memdoc">
<p>Returns the message displayed when the input is too short. </p>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WLengthValidator.html#a61299b45c89e93a8d7aa7f2570242286" title="Sets the message to display when the input is too short.">setInvalidTooShortText(const WString&)</a> </dd></dl>
</div>
</div>
<a class="anchor" id="ad146808a017f57c23b0cec6d1126f145"></a><!-- doxytag: member="Wt::WLengthValidator::javaScriptValidate" ref="ad146808a017f57c23b0cec6d1126f145" args="() const " -->
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<td class="memname">std::string Wt::WLengthValidator::javaScriptValidate </td>
<td>(</td>
<td class="paramname"></td><td>)</td>
<td> const<code> [virtual]</code></td>
</tr>
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</div>
<div class="memdoc">
<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 from <a class="el" href="classWt_1_1WValidator.html#a2aca1c34abaf4a35b972c3cf82ce1e48">Wt::WValidator</a>.</p>
</div>
</div>
<a class="anchor" id="a829f8c83606ed31a982e99fcd63b15fc"></a><!-- doxytag: member="Wt::WLengthValidator::maximumLength" ref="a829f8c83606ed31a982e99fcd63b15fc" args="() const " -->
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<td class="memname">int Wt::WLengthValidator::maximumLength </td>
<td>(</td>
<td class="paramname"></td><td>)</td>
<td> const</td>
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</table>
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<div class="memdoc">
<p>Returns the maximum length. </p>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WLengthValidator.html#a1f1742e015228319a10dd42a38ef79f4" title="Sets the maximum length.">setMaximumLength(int)</a> </dd></dl>
</div>
</div>
<a class="anchor" id="a68dede1a5faa6d83f9347d8dde68f6d1"></a><!-- doxytag: member="Wt::WLengthValidator::minimumLength" ref="a68dede1a5faa6d83f9347d8dde68f6d1" args="() const " -->
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<td class="memname">int Wt::WLengthValidator::minimumLength </td>
<td>(</td>
<td class="paramname"></td><td>)</td>
<td> const</td>
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<p>Returns the minimum length. </p>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WLengthValidator.html#a6a772dfac01805c714374fd290ff6e6d" title="Sets the minimum length.">setMinimumLength(int)</a> </dd></dl>
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</div>
<a class="anchor" id="aa24dd0a946f937e0dde081003bf30fec"></a><!-- doxytag: member="Wt::WLengthValidator::setInvalidTooLongText" ref="aa24dd0a946f937e0dde081003bf30fec" args="(const WString &text)" -->
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<td class="memname">void Wt::WLengthValidator::setInvalidTooLongText </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>
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<div class="memdoc">
<p>Sets the message to display when the input is too long. </p>
<p>Depending on whether <a class="el" href="classWt_1_1WLengthValidator.html#a68dede1a5faa6d83f9347d8dde68f6d1" title="Returns the minimum length.">minimumLength()</a> is different from zero, the default message is "The input must have a length between {1} and
{2} characters" or " "The input must be no more than {2} characters". </p>
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<a class="anchor" id="a61299b45c89e93a8d7aa7f2570242286"></a><!-- doxytag: member="Wt::WLengthValidator::setInvalidTooShortText" ref="a61299b45c89e93a8d7aa7f2570242286" args="(const WString &text)" -->
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<td class="memname">void Wt::WLengthValidator::setInvalidTooShortText </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 the input is too short. </p>
<p>Depending on whether <a class="el" href="classWt_1_1WLengthValidator.html#a829f8c83606ed31a982e99fcd63b15fc" title="Returns the maximum length.">maximumLength()</a> is a real bound, the default message is "The input must have a length between {1} and {2}
characters" or " "The input must be at least {1} characters". </p>
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<a class="anchor" id="a1f1742e015228319a10dd42a38ef79f4"></a><!-- doxytag: member="Wt::WLengthValidator::setMaximumLength" ref="a1f1742e015228319a10dd42a38ef79f4" args="(int maximum)" -->
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<td class="memname">void Wt::WLengthValidator::setMaximumLength </td>
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<td class="paramname"><em>maximum</em></td><td>)</td>
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<p>Sets the maximum length. </p>
<p>The default value is the maximum integer value. </p>
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<a class="anchor" id="a6a772dfac01805c714374fd290ff6e6d"></a><!-- doxytag: member="Wt::WLengthValidator::setMinimumLength" ref="a6a772dfac01805c714374fd290ff6e6d" args="(int minimum)" -->
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<td class="memname">void Wt::WLengthValidator::setMinimumLength </td>
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<td class="paramname"><em>minimum</em></td><td>)</td>
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<p>Sets the minimum length. </p>
<p>The default value is 0. </p>
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<a class="anchor" id="a7037c50a29792374b729385d134b906e"></a><!-- doxytag: member="Wt::WLengthValidator::validate" ref="a7037c50a29792374b729385d134b906e" 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::WLengthValidator::validate </td>
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<td class="paramtype">const <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>Validates the given input. </p>
<p>The input is considered valid only when it is blank for a non-mandatory field, or has a length within the valid range. </p>
<p>Reimplemented from <a class="el" href="classWt_1_1WValidator.html#a78808215d68944dedca11ff8889374ed">Wt::WValidator</a>.</p>
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