NoEmptyElement (XmlNode property): Difference between revisions
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{{Template:XmlNode:NoEmptyElement subtitle}} | {{Template:XmlNode:NoEmptyElement subtitle}} | ||
<var>NoEmptyElement</var> indicates whether or not to serialize the method object <var>XmlNode</var> with a separate start tag and end tag instead of with a single empty-element tag ''if the node is childless''. A [[Boolean]] value of < | <var>NoEmptyElement</var> indicates whether or not to serialize the method object <var>XmlNode</var> with a separate start tag and end tag instead of with a single empty-element tag ''if the node is childless''. A <var>[[Enumerations#Using Boolean enumerations|Boolean]]</var> value of <var>True</var> serializes with a separate start tag and end tag (for example, <code><address></address></code> versus <code><address/></code>). The default value, <var>False</var>, serializes childless nodes in the usual way, that is, with an empty-element tag. | ||
<p><var>NoEmptyElement</var> may be specified for any <var>Element</var> node.</p> | <p><var>NoEmptyElement</var> may be specified for any <var>Element</var> node.</p> | ||
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<table class="syntaxTable"> | <table class="syntaxTable"> | ||
<tr><th>%currentBoolean</th> | <tr><th>%currentBoolean</th> | ||
<td>The <var>Boolean</var> enumeration value of <var class="term">nod</var>'s <var>NoEmptyElement</var> property. | <td>The <var>Boolean</var> enumeration value of object <var class="term">nod</var>'s <var>NoEmptyElement</var> property. </td></tr> | ||
<tr><th>nod</th> | <tr><th>nod</th> | ||
<td>An <var>XmlNode</var> object expression.</td></tr> | <td>An <var>XmlNode</var> object expression.</td></tr> | ||
<tr><th>newBoolean</th> | <tr><th>newBoolean</th> | ||
<td>The <var>Boolean</var> value to | <td>The <var>Boolean</var> value to set for <var class="term">nod</var>'s <var>NoEmptyElement</var> property.</td></tr> | ||
</table> | </table> | ||
==Usage notes== | ==Usage notes== | ||
<ul> | <ul> | ||
<li><var>NoEmptyElement</var> can be useful if you are using | <div id="browserExample"></div> | ||
< | <li><var>NoEmptyElement</var> can be useful if you are using <var class="product">SOUL</var> to generate HTML. Tests show that some browsers work correctly for certain childless elements only if they have an empty element tag, and for other childless elements they work correctly only if there are separate start and end tags. Because of this inconsistency, using the <var>NoEmptyElt</var> option of the serialization methods (for example, see the <var>[[Serial_(XmlDoc/XmlNode_function)#noempty|Serial]]</var> method) to suppress all empty element tags does not guarantee successful HTML. | ||
<p> | |||
For example, many browsers require the <code><div></code> tag to be serialized with a separate start and end tag (<code>NoEmptyElement=True</code>), and they require the <code><br></code> tag to be serialized without a separated end tag (<code>NoEmptyElement=False</code> — the default). This can readily be accomplished as follows: </p> | |||
<p class="code"><nowiki>%d is object xmlDoc auto new | |||
%html is object xmlNode | |||
%nd is object xmlNode | |||
%html = %d:addElement('html') | |||
* Add children of 'html' element: | |||
%nd = %html:addElement('div') | |||
%nd:noEmptyElement = true; * div must separate start and end tags | |||
%nd:addAttribute('id', 'x') | |||
%nd = %html:addElement('br') | |||
* End of 'html' element children | |||
%d:print | |||
</nowiki></p> | |||
The result of the above fragment is: | |||
<p class="output"><nowiki><html> | |||
<div id="x"></div> | |||
<br/> | |||
</html> | |||
</nowiki></p> | |||
</ul> | </ul> | ||
A variation of this example is part of the larger discussion of <var>XmlDoc</var> [[XmlDoc API#Information form and content|Information form and content]]. | |||
==Examples== | ==Examples== | ||
The node in the following fragment is serialized with a start and end tag: | The node in the following fragment is serialized with a start and end tag: | ||
<p class="code">%texta = %form:[[AddElement_(XmlDoc/XmlNode_function)|addElement]]('textArea') | <p class="code">%texta = %form:[[AddElement_(XmlDoc/XmlNode_function)|addElement]]('textArea') | ||
| Line 33: | Line 57: | ||
The result is: | The result is: | ||
<p class="output"><textArea name="foo" rows="15" cols="40"></textArea> | <p class="output"><textArea name="foo" rows="15" cols="40"></textArea> | ||
</p | </p> | ||
==Request- | ==Request-cancellation errors (for set method)== | ||
This list is not exhaustive: it does <i>not</i> include all the errors that are request cancelling. | |||
<ul> | <ul> | ||
<li><var class="term"> | <li>The <var class="term">newBoolean</var> setting is an invalid value. | ||
</ul> | </ul> | ||
==See also== | ==See also== | ||
{{Template:XmlNode:NoEmptyElement footer}} | {{Template:XmlNode:NoEmptyElement footer}} | ||
Latest revision as of 18:03, 18 March 2014
Suppress/produce empty tag when serializing this Element, if childless (XmlNode class)
NoEmptyElement indicates whether or not to serialize the method object XmlNode with a separate start tag and end tag instead of with a single empty-element tag if the node is childless. A Boolean value of True serializes with a separate start tag and end tag (for example, <address></address> versus <address/>). The default value, False, serializes childless nodes in the usual way, that is, with an empty-element tag.
NoEmptyElement may be specified for any Element node.
Syntax
%currentBoolean = nod:NoEmptyElement nod:NoEmptyElement = newBoolean
Syntax terms
| %currentBoolean | The Boolean enumeration value of object nod's NoEmptyElement property. |
|---|---|
| nod | An XmlNode object expression. |
| newBoolean | The Boolean value to set for nod's NoEmptyElement property. |
Usage notes
- NoEmptyElement can be useful if you are using SOUL to generate HTML. Tests show that some browsers work correctly for certain childless elements only if they have an empty element tag, and for other childless elements they work correctly only if there are separate start and end tags. Because of this inconsistency, using the NoEmptyElt option of the serialization methods (for example, see the Serial method) to suppress all empty element tags does not guarantee successful HTML.
For example, many browsers require the
<div>tag to be serialized with a separate start and end tag (NoEmptyElement=True), and they require the<br>tag to be serialized without a separated end tag (NoEmptyElement=False— the default). This can readily be accomplished as follows:%d is object xmlDoc auto new %html is object xmlNode %nd is object xmlNode %html = %d:addElement('html') * Add children of 'html' element: %nd = %html:addElement('div') %nd:noEmptyElement = true; * div must separate start and end tags %nd:addAttribute('id', 'x') %nd = %html:addElement('br') * End of 'html' element children %d:print
The result of the above fragment is:
<html> <div id="x"></div> <br/> </html>
A variation of this example is part of the larger discussion of XmlDoc Information form and content.
Examples
The node in the following fragment is serialized with a start and end tag:
%texta = %form:addElement('textArea') %texta:noEmptyElement = True %texta:addAttribute('name', 'foo') %texta:addAttribute('rows', '15') %texta:addAttribute('cols', '40') %texta:print
The result is:
<textArea name="foo" rows="15" cols="40"></textArea>
Request-cancellation errors (for set method)
This list is not exhaustive: it does not include all the errors that are request cancelling.
- The newBoolean setting is an invalid value.