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| 53 | ||
| 54 | <H3><A NAME="SECTION00156212000000000000000"></A><A NAME="dom-exceptions"></A> | |
| 55 | <BR> | |
| 56 | 13.6.2.12 Exceptions | |
| 57 | </H3> | |
| 58 | ||
| 59 | <P> | |
| 60 | ||
| 61 | <span class="versionnote">New in version 2.1.</span> | |
| 62 | ||
| 63 | <P> | |
| 64 | The DOM Level 2 recommendation defines a single exception, | |
| 65 | <tt class="exception">DOMException</tt>, and a number of constants that allow | |
| 66 | applications to determine what sort of error occurred. | |
| 67 | <tt class="exception">DOMException</tt> instances carry a <tt class="member">code</tt> attribute | |
| 68 | that provides the appropriate value for the specific exception. | |
| 69 | ||
| 70 | <P> | |
| 71 | The Python DOM interface provides the constants, but also expands the | |
| 72 | set of exceptions so that a specific exception exists for each of the | |
| 73 | exception codes defined by the DOM. The implementations must raise | |
| 74 | the appropriate specific exception, each of which carries the | |
| 75 | appropriate value for the <tt class="member">code</tt> attribute. | |
| 76 | ||
| 77 | <P> | |
| 78 | <dl><dt><b><span class="typelabel">exception</span> <tt id='l2h-4428' xml:id='l2h-4428' class="exception">DOMException</tt></b></dt> | |
| 79 | <dd> | |
| 80 | Base exception class used for all specific DOM exceptions. This | |
| 81 | exception class cannot be directly instantiated. | |
| 82 | </dd></dl> | |
| 83 | ||
| 84 | <P> | |
| 85 | <dl><dt><b><span class="typelabel">exception</span> <tt id='l2h-4429' xml:id='l2h-4429' class="exception">DomstringSizeErr</tt></b></dt> | |
| 86 | <dd> | |
| 87 | Raised when a specified range of text does not fit into a string. | |
| 88 | This is not known to be used in the Python DOM implementations, but | |
| 89 | may be received from DOM implementations not written in Python. | |
| 90 | </dd></dl> | |
| 91 | ||
| 92 | <P> | |
| 93 | <dl><dt><b><span class="typelabel">exception</span> <tt id='l2h-4430' xml:id='l2h-4430' class="exception">HierarchyRequestErr</tt></b></dt> | |
| 94 | <dd> | |
| 95 | Raised when an attempt is made to insert a node where the node type | |
| 96 | is not allowed. | |
| 97 | </dd></dl> | |
| 98 | ||
| 99 | <P> | |
| 100 | <dl><dt><b><span class="typelabel">exception</span> <tt id='l2h-4431' xml:id='l2h-4431' class="exception">IndexSizeErr</tt></b></dt> | |
| 101 | <dd> | |
| 102 | Raised when an index or size parameter to a method is negative or | |
| 103 | exceeds the allowed values. | |
| 104 | </dd></dl> | |
| 105 | ||
| 106 | <P> | |
| 107 | <dl><dt><b><span class="typelabel">exception</span> <tt id='l2h-4432' xml:id='l2h-4432' class="exception">InuseAttributeErr</tt></b></dt> | |
| 108 | <dd> | |
| 109 | Raised when an attempt is made to insert an <tt class="class">Attr</tt> node that | |
| 110 | is already present elsewhere in the document. | |
| 111 | </dd></dl> | |
| 112 | ||
| 113 | <P> | |
| 114 | <dl><dt><b><span class="typelabel">exception</span> <tt id='l2h-4433' xml:id='l2h-4433' class="exception">InvalidAccessErr</tt></b></dt> | |
| 115 | <dd> | |
| 116 | Raised if a parameter or an operation is not supported on the | |
| 117 | underlying object. | |
| 118 | </dd></dl> | |
| 119 | ||
| 120 | <P> | |
| 121 | <dl><dt><b><span class="typelabel">exception</span> <tt id='l2h-4434' xml:id='l2h-4434' class="exception">InvalidCharacterErr</tt></b></dt> | |
| 122 | <dd> | |
| 123 | This exception is raised when a string parameter contains a | |
| 124 | character that is not permitted in the context it's being used in by | |
| 125 | the XML 1.0 recommendation. For example, attempting to create an | |
| 126 | <tt class="class">Element</tt> node with a space in the element type name will | |
| 127 | cause this error to be raised. | |
| 128 | </dd></dl> | |
| 129 | ||
| 130 | <P> | |
| 131 | <dl><dt><b><span class="typelabel">exception</span> <tt id='l2h-4435' xml:id='l2h-4435' class="exception">InvalidModificationErr</tt></b></dt> | |
| 132 | <dd> | |
| 133 | Raised when an attempt is made to modify the type of a node. | |
| 134 | </dd></dl> | |
| 135 | ||
| 136 | <P> | |
| 137 | <dl><dt><b><span class="typelabel">exception</span> <tt id='l2h-4436' xml:id='l2h-4436' class="exception">InvalidStateErr</tt></b></dt> | |
| 138 | <dd> | |
| 139 | Raised when an attempt is made to use an object that is not defined or is no | |
| 140 | longer usable. | |
| 141 | </dd></dl> | |
| 142 | ||
| 143 | <P> | |
| 144 | <dl><dt><b><span class="typelabel">exception</span> <tt id='l2h-4437' xml:id='l2h-4437' class="exception">NamespaceErr</tt></b></dt> | |
| 145 | <dd> | |
| 146 | If an attempt is made to change any object in a way that is not | |
| 147 | permitted with regard to the | |
| 148 | <em class="citetitle"><a | |
| 149 | href="http://www.w3.org/TR/REC-xml-names/" | |
| 150 | title="Namespaces in XML" | |
| 151 | >Namespaces in XML</a></em> | |
| 152 | recommendation, this exception is raised. | |
| 153 | </dd></dl> | |
| 154 | ||
| 155 | <P> | |
| 156 | <dl><dt><b><span class="typelabel">exception</span> <tt id='l2h-4438' xml:id='l2h-4438' class="exception">NotFoundErr</tt></b></dt> | |
| 157 | <dd> | |
| 158 | Exception when a node does not exist in the referenced context. For | |
| 159 | example, <tt class="method">NamedNodeMap.removeNamedItem()</tt> will raise this if | |
| 160 | the node passed in does not exist in the map. | |
| 161 | </dd></dl> | |
| 162 | ||
| 163 | <P> | |
| 164 | <dl><dt><b><span class="typelabel">exception</span> <tt id='l2h-4439' xml:id='l2h-4439' class="exception">NotSupportedErr</tt></b></dt> | |
| 165 | <dd> | |
| 166 | Raised when the implementation does not support the requested type | |
| 167 | of object or operation. | |
| 168 | </dd></dl> | |
| 169 | ||
| 170 | <P> | |
| 171 | <dl><dt><b><span class="typelabel">exception</span> <tt id='l2h-4440' xml:id='l2h-4440' class="exception">NoDataAllowedErr</tt></b></dt> | |
| 172 | <dd> | |
| 173 | This is raised if data is specified for a node which does not | |
| 174 | support data. | |
| 175 | </dd></dl> | |
| 176 | ||
| 177 | <P> | |
| 178 | <dl><dt><b><span class="typelabel">exception</span> <tt id='l2h-4441' xml:id='l2h-4441' class="exception">NoModificationAllowedErr</tt></b></dt> | |
| 179 | <dd> | |
| 180 | Raised on attempts to modify an object where modifications are not | |
| 181 | allowed (such as for read-only nodes). | |
| 182 | </dd></dl> | |
| 183 | ||
| 184 | <P> | |
| 185 | <dl><dt><b><span class="typelabel">exception</span> <tt id='l2h-4442' xml:id='l2h-4442' class="exception">SyntaxErr</tt></b></dt> | |
| 186 | <dd> | |
| 187 | Raised when an invalid or illegal string is specified. | |
| 188 | </dd></dl> | |
| 189 | ||
| 190 | <P> | |
| 191 | <dl><dt><b><span class="typelabel">exception</span> <tt id='l2h-4443' xml:id='l2h-4443' class="exception">WrongDocumentErr</tt></b></dt> | |
| 192 | <dd> | |
| 193 | Raised when a node is inserted in a different document than it | |
| 194 | currently belongs to, and the implementation does not support | |
| 195 | migrating the node from one document to the other. | |
| 196 | </dd></dl> | |
| 197 | ||
| 198 | <P> | |
| 199 | The exception codes defined in the DOM recommendation map to the | |
| 200 | exceptions described above according to this table: | |
| 201 | ||
| 202 | <P> | |
| 203 | <div class="center"><table class="realtable"> | |
| 204 | <thead> | |
| 205 | <tr> | |
| 206 | <th class="left" >Constant</th> | |
| 207 | <th class="left" >Exception</th> | |
| 208 | </tr> | |
| 209 | </thead> | |
| 210 | <tbody> | |
| 211 | <tr><td class="left" valign="baseline"><tt class="constant">DOMSTRING_SIZE_ERR</tt></td> | |
| 212 | <td class="left" ><tt class="exception">DomstringSizeErr</tt></td></tr> | |
| 213 | <tr><td class="left" valign="baseline"><tt class="constant">HIERARCHY_REQUEST_ERR</tt></td> | |
| 214 | <td class="left" ><tt class="exception">HierarchyRequestErr</tt></td></tr> | |
| 215 | <tr><td class="left" valign="baseline"><tt class="constant">INDEX_SIZE_ERR</tt></td> | |
| 216 | <td class="left" ><tt class="exception">IndexSizeErr</tt></td></tr> | |
| 217 | <tr><td class="left" valign="baseline"><tt class="constant">INUSE_ATTRIBUTE_ERR</tt></td> | |
| 218 | <td class="left" ><tt class="exception">InuseAttributeErr</tt></td></tr> | |
| 219 | <tr><td class="left" valign="baseline"><tt class="constant">INVALID_ACCESS_ERR</tt></td> | |
| 220 | <td class="left" ><tt class="exception">InvalidAccessErr</tt></td></tr> | |
| 221 | <tr><td class="left" valign="baseline"><tt class="constant">INVALID_CHARACTER_ERR</tt></td> | |
| 222 | <td class="left" ><tt class="exception">InvalidCharacterErr</tt></td></tr> | |
| 223 | <tr><td class="left" valign="baseline"><tt class="constant">INVALID_MODIFICATION_ERR</tt></td> | |
| 224 | <td class="left" ><tt class="exception">InvalidModificationErr</tt></td></tr> | |
| 225 | <tr><td class="left" valign="baseline"><tt class="constant">INVALID_STATE_ERR</tt></td> | |
| 226 | <td class="left" ><tt class="exception">InvalidStateErr</tt></td></tr> | |
| 227 | <tr><td class="left" valign="baseline"><tt class="constant">NAMESPACE_ERR</tt></td> | |
| 228 | <td class="left" ><tt class="exception">NamespaceErr</tt></td></tr> | |
| 229 | <tr><td class="left" valign="baseline"><tt class="constant">NOT_FOUND_ERR</tt></td> | |
| 230 | <td class="left" ><tt class="exception">NotFoundErr</tt></td></tr> | |
| 231 | <tr><td class="left" valign="baseline"><tt class="constant">NOT_SUPPORTED_ERR</tt></td> | |
| 232 | <td class="left" ><tt class="exception">NotSupportedErr</tt></td></tr> | |
| 233 | <tr><td class="left" valign="baseline"><tt class="constant">NO_DATA_ALLOWED_ERR</tt></td> | |
| 234 | <td class="left" ><tt class="exception">NoDataAllowedErr</tt></td></tr> | |
| 235 | <tr><td class="left" valign="baseline"><tt class="constant">NO_MODIFICATION_ALLOWED_ERR</tt></td> | |
| 236 | <td class="left" ><tt class="exception">NoModificationAllowedErr</tt></td></tr> | |
| 237 | <tr><td class="left" valign="baseline"><tt class="constant">SYNTAX_ERR</tt></td> | |
| 238 | <td class="left" ><tt class="exception">SyntaxErr</tt></td></tr> | |
| 239 | <tr><td class="left" valign="baseline"><tt class="constant">WRONG_DOCUMENT_ERR</tt></td> | |
| 240 | <td class="left" ><tt class="exception">WrongDocumentErr</tt></td></tr></tbody> | |
| 241 | </table></div> | |
| 242 | ||
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| 279 | <span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span> | |
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