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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<div class="navpath"><a class="el" href="namespaceWt.html">Wt</a>::<a class="el" href="classWt_1_1WFormWidget.html">WFormWidget</a>
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<h1>Wt::WFormWidget Class Reference</h1><!-- doxytag: class="Wt::WFormWidget" --><!-- doxytag: inherits="Wt::WInteractWidget" -->An abstract widget that corresponds to an HTML form element.
<a href="#_details">More...</a>
<p>
<code>#include <Wt/WFormWidget></code>
<p>
<div class="dynheader">
Inheritance diagram for Wt::WFormWidget:</div>
<div class="dynsection">
<p><center><img src="classWt_1_1WFormWidget__inherit__graph.png" border="0" usemap="#Wt_1_1WFormWidget__inherit__map" alt="Inheritance graph"></center>
<map name="Wt_1_1WFormWidget__inherit__map">
<area shape="rect" href="classWt_1_1WAbstractToggleButton.html" title="An abstract base class for radio buttons and check boxes." alt="" coords="109,379,291,405"><area shape="rect" href="classWt_1_1WComboBox.html" title="A widget that provides a drop-down combo-box control." alt="" coords="315,379,435,405"><area shape="rect" href="classWt_1_1WLineEdit.html" title="A widget that provides a single line edit." alt="" coords="459,379,563,405"><area shape="rect" href="classWt_1_1WPushButton.html" title="A widget that represents a push button." alt="" coords="587,379,712,405"><area shape="rect" href="classWt_1_1WTextArea.html" title="A widget that provides a multi-line edit." alt="" coords="736,379,845,405"><area shape="rect" href="classWt_1_1WInteractWidget.html" title="An abstract widget that can receive user-interface interaction." alt="" coords="440,229,581,256"><area shape="rect" href="classWt_1_1WWebWidget.html" title="A base class for widgets with an HTML counterpart." alt="" coords="449,155,572,181"><area shape="rect" href="classWt_1_1WWidget.html" title="The abstract base class for a user-interface component." alt="" coords="463,80,559,107"><area shape="rect" href="classWt_1_1WObject.html" title="A base class for objects that participate in the signal/slot system." alt="" coords="463,5,559,32"><area shape="rect" href="classWt_1_1WCheckBox.html" title="A user control that represents a check box." alt="" coords="5,453,123,480"><area shape="rect" href="classWt_1_1WRadioButton.html" title="A user control that represents a radio button." alt="" coords="147,453,275,480"><area shape="rect" href="classWt_1_1WSelectionBox.html" title="A selection box allows selection from a list of options." alt="" coords="308,453,441,480"><area shape="rect" href="classWt_1_1WTextEdit.html" title="A rich-text XHTML editor." alt="" coords="739,453,843,480"></map>
<center><font size="2">[<a href="graph_legend.html">legend</a>]</font></center></div>
<p>
<a href="classWt_1_1WFormWidget-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 Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="63194da5d63a46188b38bbda2936cf61"></a><!-- doxytag: member="Wt::WFormWidget::WFormWidget" ref="63194da5d63a46188b38bbda2936cf61" args="(WContainerWidget *parent=0)" -->
</td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WFormWidget.html#63194da5d63a46188b38bbda2936cf61">WFormWidget</a> (<a class="el" href="classWt_1_1WContainerWidget.html">WContainerWidget</a> *parent=0)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Creates a WFormWidget with an optional parent. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WFormWidget.html#f9027662449d08a70e361611f6fcf4c7">~WFormWidget</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Destructor. <a href="#f9027662449d08a70e361611f6fcf4c7"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="classWt_1_1WLabel.html">WLabel</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WFormWidget.html#82f0eaf7fb35132644b429e2b3b8930f">label</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns the label associated with this widget. <a href="#82f0eaf7fb35132644b429e2b3b8930f"></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_1WFormWidget.html#f7db6da14a0530408a7b68668d0d11ff">setHidden</a> (bool hidden)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Sets the hidden state of this widget. <a href="#f7db6da14a0530408a7b68668d0d11ff"></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_1WFormWidget.html#a773d16013d6959149ce5081e84b259c">setValidator</a> (<a class="el" href="classWt_1_1WValidator.html">WValidator</a> *validator)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Sets a validator for this field. <a href="#a773d16013d6959149ce5081e84b259c"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="4643be79e2c92bc448ce46e7d314335b"></a><!-- doxytag: member="Wt::WFormWidget::validator" ref="4643be79e2c92bc448ce46e7d314335b" args="() const " -->
<a class="el" href="classWt_1_1WValidator.html">WValidator</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WFormWidget.html#4643be79e2c92bc448ce46e7d314335b">validator</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns the validator. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="7960606393d6158abb4a2d8c9d8fd2ef"></a><!-- doxytag: member="Wt::WFormWidget::validate" ref="7960606393d6158abb4a2d8c9d8fd2ef" args="()" -->
virtual <a class="el" href="classWt_1_1WValidator.html#638a1feefca259ea2f806a8add2d18a3">WValidator::State</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WFormWidget.html#7960606393d6158abb4a2d8c9d8fd2ef">validate</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Validates the field. <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_1WFormWidget.html#d26d15f452d47832a4467608977f03f5">setEnabled</a> (bool enabled)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Sets whether the widget is enabled. <a href="#d26d15f452d47832a4467608977f03f5"></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_1WFormWidget.html#fe33f5c3658ddbd08fec9f6c203c578b">setFocus</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Gives focus to this widget. <a href="#fe33f5c3658ddbd08fec9f6c203c578b"></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_1WFormWidget.html#353ae79a10748c870f1fa2ce1f174eaa">setReadOnly</a> (bool readOnly)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Sets the element read-only. <a href="#353ae79a10748c870f1fa2ce1f174eaa"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WFormWidget.html#06ffc301c0cfb7f9da4c74deb469282a">isReadOnly</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns whether the form element is read-only. <a href="#06ffc301c0cfb7f9da4c74deb469282a"></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_1WFormWidget.html#92de7a4d9ca6796607dc9fd26f608436">setEmptyText</a> (const <a class="el" href="classWt_1_1WString.html">WString</a> &emptyText)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Sets the empty text to be shown when the field is empty. <a href="#92de7a4d9ca6796607dc9fd26f608436"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">const <a class="el" href="classWt_1_1WString.html">WString</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WFormWidget.html#0f9f7ac3c423521f9ab0df855704eb71">emptyText</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns the empty text to be shown when the field is empty. <a href="#0f9f7ac3c423521f9ab0df855704eb71"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="5216ba1594b5dc525cc47cad593c7ba8"></a><!-- doxytag: member="Wt::WFormWidget::changed" ref="5216ba1594b5dc525cc47cad593c7ba8" args="()" -->
<a class="el" href="classWt_1_1EventSignal.html">EventSignal</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WFormWidget.html#5216ba1594b5dc525cc47cad593c7ba8">changed</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Signal emitted when the value was changed. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="4f7fcabf3e2f51b884230c179ee52137"></a><!-- doxytag: member="Wt::WFormWidget::selected" ref="4f7fcabf3e2f51b884230c179ee52137" args="()" -->
<a class="el" href="classWt_1_1EventSignal.html">EventSignal</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WFormWidget.html#4f7fcabf3e2f51b884230c179ee52137">selected</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Signal emitted when ?? <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="5158413489fa4721d4689cc4639c914e"></a><!-- doxytag: member="Wt::WFormWidget::blurred" ref="5158413489fa4721d4689cc4639c914e" args="()" -->
<a class="el" href="classWt_1_1EventSignal.html">EventSignal</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WFormWidget.html#5158413489fa4721d4689cc4639c914e">blurred</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Signal emitted when the widget lost focus. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="fe56345bd7225852e2f8ef92bc048f6a"></a><!-- doxytag: member="Wt::WFormWidget::focussed" ref="fe56345bd7225852e2f8ef92bc048f6a" args="()" -->
<a class="el" href="classWt_1_1EventSignal.html">EventSignal</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WFormWidget.html#fe56345bd7225852e2f8ef92bc048f6a">focussed</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Signal emitted when the widget recieved focus. <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 void </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WFormWidget.html#503448cefdd06c5fe18bf13e911e8bb8">enableAjax</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Progresses to an Ajax-enabled widget. <a href="#503448cefdd06c5fe18bf13e911e8bb8"></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_1WFormWidget.html#ff5d72ac52040b97a77c21b0b38d44c8">propagateSetEnabled</a> (bool enabled)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Propagates that a widget was enabled or disabled through children. <a href="#ff5d72ac52040b97a77c21b0b38d44c8"></a><br></td></tr>
</table>
<hr><a name="_details"></a><h2>Detailed Description</h2>
An abstract widget that corresponds to an HTML form element.
<p>
A WFormWidget may receive focus, can be disabled, and can have a label that acts as proxy for getting focus. It provides signals which reflect changes to its value, or changes to its focus.<p>
Form widgets also have built-in support for validation, using <a class="el" href="classWt_1_1WFormWidget.html#a773d16013d6959149ce5081e84b259c" title="Sets a validator for this field.">setValidator(WValidator *)</a>. If the validator provide client-side validation, then an invalid validation state is reflected using the style class <code>"Wt-invalid"</code>. All validators provided by Wt implement client-side validation.<p>
On the server-side, use <a class="el" href="classWt_1_1WFormWidget.html#7960606393d6158abb4a2d8c9d8fd2ef" title="Validates the field.">validate()</a> method to validate the content using a validator previously set. <hr><h2>Constructor & Destructor Documentation</h2>
<a class="anchor" name="f9027662449d08a70e361611f6fcf4c7"></a><!-- doxytag: member="Wt::WFormWidget::~WFormWidget" ref="f9027662449d08a70e361611f6fcf4c7" args="()" -->
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<td class="memname">Wt::WFormWidget::~WFormWidget </td>
<td>(</td>
<td class="paramname"> </td>
<td> ) </td>
<td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>
Destructor.
<p>
If a label was associated with the widget, its buddy is reset to <code>0</code>.
</div>
</div><p>
<hr><h2>Member Function Documentation</h2>
<a class="anchor" name="82f0eaf7fb35132644b429e2b3b8930f"></a><!-- doxytag: member="Wt::WFormWidget::label" ref="82f0eaf7fb35132644b429e2b3b8930f" args="() const " -->
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<td class="memname"><a class="el" href="classWt_1_1WLabel.html">WLabel</a>* Wt::WFormWidget::label </td>
<td>(</td>
<td class="paramname"> </td>
<td> ) </td>
<td> const<code> [inline]</code></td>
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<div class="memdoc">
<p>
Returns the label associated with this widget.
<p>
Returns the label (if there is one) that acts as a proxy for this widget.<p>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WLabel.html#f468c613eab7d184c68fd6ae20978de5" title="Sets the buddy of this label.">WLabel::setBuddy(WFormWidget *)</a> </dd></dl>
</div>
</div><p>
<a class="anchor" name="f7db6da14a0530408a7b68668d0d11ff"></a><!-- doxytag: member="Wt::WFormWidget::setHidden" ref="f7db6da14a0530408a7b68668d0d11ff" args="(bool hidden)" -->
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<td class="memname">void Wt::WFormWidget::setHidden </td>
<td>(</td>
<td class="paramtype">bool </td>
<td class="paramname"> <em>hidden</em> </td>
<td> ) </td>
<td><code> [virtual]</code></td>
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<div class="memdoc">
<p>
Sets the hidden state of this widget.
<p>
If the widget has a label, it is hidden and shown together with this widget.
<p>Reimplemented from <a class="el" href="classWt_1_1WWebWidget.html#bf00d84015803f7553c9e6650dc10bd4">Wt::WWebWidget</a>.</p>
</div>
</div><p>
<a class="anchor" name="a773d16013d6959149ce5081e84b259c"></a><!-- doxytag: member="Wt::WFormWidget::setValidator" ref="a773d16013d6959149ce5081e84b259c" args="(WValidator *validator)" -->
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<td class="memname">void Wt::WFormWidget::setValidator </td>
<td>(</td>
<td class="paramtype"><a class="el" href="classWt_1_1WValidator.html">WValidator</a> * </td>
<td class="paramname"> <em>validator</em> </td>
<td> ) </td>
<td></td>
</tr>
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<div class="memdoc">
<p>
Sets a validator for this field.
<p>
The validator is used to validate the current input.<p>
If the validator has no parent yet, then ownership is transferred to the form field, and thus the validator will be deleted together with the form field.<p>
The default value is <code>0</code>.<p>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WFormWidget.html#7960606393d6158abb4a2d8c9d8fd2ef" title="Validates the field.">validate()</a> </dd></dl>
</div>
</div><p>
<a class="anchor" name="d26d15f452d47832a4467608977f03f5"></a><!-- doxytag: member="Wt::WFormWidget::setEnabled" ref="d26d15f452d47832a4467608977f03f5" args="(bool enabled)" -->
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<td class="memname">void Wt::WFormWidget::setEnabled </td>
<td>(</td>
<td class="paramtype">bool </td>
<td class="paramname"> <em>enabled</em> </td>
<td> ) </td>
<td></td>
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<div class="memdoc">
<p>
Sets whether the widget is enabled.
<p>
A widget that is disabled cannot receive focus or user interaction.<p>
This is the opposite of <a class="el" href="classWt_1_1WWebWidget.html#0d73f278ece864ab5322e92ff5f6de6c" title="Sets whether the widget is disabled.">setDisabled()</a>.
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<a class="anchor" name="fe33f5c3658ddbd08fec9f6c203c578b"></a><!-- doxytag: member="Wt::WFormWidget::setFocus" ref="fe33f5c3658ddbd08fec9f6c203c578b" args="()" -->
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<td class="memname">void Wt::WFormWidget::setFocus </td>
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Gives focus to this widget.
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Giving focus to an input element only works when JavaScript is enabled.
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<a class="anchor" name="353ae79a10748c870f1fa2ce1f174eaa"></a><!-- doxytag: member="Wt::WFormWidget::setReadOnly" ref="353ae79a10748c870f1fa2ce1f174eaa" args="(bool readOnly)" -->
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<td class="memname">void Wt::WFormWidget::setReadOnly </td>
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Sets the element read-only.
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A read-only form element cannot be edited, but the contents can still be selected.<p>
By default, a form element area is not read-only.<p>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WFormWidget.html#d26d15f452d47832a4467608977f03f5" title="Sets whether the widget is enabled.">setEnabled()</a> </dd></dl>
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<a class="anchor" name="06ffc301c0cfb7f9da4c74deb469282a"></a><!-- doxytag: member="Wt::WFormWidget::isReadOnly" ref="06ffc301c0cfb7f9da4c74deb469282a" args="() const " -->
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Returns whether the form element is read-only.
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<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WFormWidget.html#353ae79a10748c870f1fa2ce1f174eaa" title="Sets the element read-only.">setReadOnly()</a> </dd></dl>
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<a class="anchor" name="92de7a4d9ca6796607dc9fd26f608436"></a><!-- doxytag: member="Wt::WFormWidget::setEmptyText" ref="92de7a4d9ca6796607dc9fd26f608436" args="(const WString &emptyText)" -->
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<td class="memname">void Wt::WFormWidget::setEmptyText </td>
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Sets the empty text to be shown when the field is empty.
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<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WFormWidget.html#0f9f7ac3c423521f9ab0df855704eb71" title="Returns the empty text to be shown when the field is empty.">emptyText()</a> </dd></dl>
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<a class="anchor" name="0f9f7ac3c423521f9ab0df855704eb71"></a><!-- doxytag: member="Wt::WFormWidget::emptyText" ref="0f9f7ac3c423521f9ab0df855704eb71" args="()" -->
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Returns the empty text to be shown when the field is empty.
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<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WFormWidget.html#92de7a4d9ca6796607dc9fd26f608436" title="Sets the empty text to be shown when the field is empty.">setEmptyText()</a> </dd></dl>
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<a class="anchor" name="503448cefdd06c5fe18bf13e911e8bb8"></a><!-- doxytag: member="Wt::WFormWidget::enableAjax" ref="503448cefdd06c5fe18bf13e911e8bb8" args="()" -->
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<td class="memname">void Wt::WFormWidget::enableAjax </td>
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Progresses to an Ajax-enabled widget.
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This method is called when the progressive bootstrap method is used, and support for AJAX has been detected. The default behavior will upgrade the widget's event handling to use AJAX instead of full page reloads, and propagate the call to its children.<p>
You may want to reimplement this method if you want to make changes to widget when AJAX is enabled. You should always call the base implementation.<p>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WApplication.html#78016406c4746c56b2c2ffce7c5e181f" title="Progresses to an Ajax-enabled user interface.">WApplication::enableAjax()</a> </dd></dl>
<p>Reimplemented from <a class="el" href="classWt_1_1WWebWidget.html#2893433f4aa1d6775875f1ebddd7c5ba">Wt::WWebWidget</a>.</p>
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<a class="anchor" name="ff5d72ac52040b97a77c21b0b38d44c8"></a><!-- doxytag: member="Wt::WFormWidget::propagateSetEnabled" ref="ff5d72ac52040b97a77c21b0b38d44c8" args="(bool enabled)" -->
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<td class="memname">void Wt::WFormWidget::propagateSetEnabled </td>
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Propagates that a widget was enabled or disabled through children.
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When enabling or disabling a widget, you usually also want to disable contained children. This method is called by <a class="el" href="classWt_1_1WWebWidget.html#0d73f278ece864ab5322e92ff5f6de6c" title="Sets whether the widget is disabled.">setDisabled()</a> to propagate its state to all children.<p>
You may want to reimplement this method if they wish to render differently when a widget is disabled. The default implementation will propagate the signal to all children.
<p>Reimplemented from <a class="el" href="classWt_1_1WWebWidget.html#a9655ae1c50b9c979b6fe93f9d0064d3">Wt::WWebWidget</a>.</p>
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