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The <a4j:log > component generates JavaScript that opens a debug window with useful debug information.
Table 6.54. a4j : log attributes
| Attribute Name |
Description
|
|---|---|
| binding | JSF: The attribute takes a value-binding expression for a component property of a backing bean |
| dir | HTML: Direction indication for text that does not inherit directionality. Valid values are "LTR" (left-to-right) and "RTL" (right-to-left) |
| height | Height of pop-up. Default value is "600". |
| hotkey | Keyboard key for activate ( in combination with CTRL+SHIFT ) log window. Default value is "L" |
| id | JSF: Every component may have a unique id that is automatically created if omitted |
| lang | HTML: Code describing the language used in the generated markup for this component |
| level | Log level. The possible values are "FATAL", "ERROR", "WARN", "INFO", "DEBUG", "ALL". Component sets level 'ALL' by default. |
| name | Name of pop-up window. Default value is "LogWindow" |
| onclick | DHTML: The client-side script method to be called when the element is clicked |
| ondblclick | DHTML: The client-side script method to be called when the element is double-clicked |
| onkeydown | DHTML: The client-side script method to be called when a key is pressed down over the element |
| onkeypress | DHTML: The client-side script method to be called when a key is pressed over the element and released |
| onkeyup | DHTML: The client-side script method to be called when a key is released |
| onmousedown | DHTML: The client-side script method to be called when a mouse button is pressed down over the element |
| onmousemove | DHTML: The client-side script method to be called when a pointer is moved within the element |
| onmouseout | DHTML: The client-side script method to be called when a pointer is moved away from the element |
| onmouseover | DHTML: The client-side script method to be called when a pointer is moved onto the element |
| onmouseup | DHTML: The client-side script method to be called when a mouse button is released |
| popup | Renders log as pop-up window or as div element on the page. Default value is "true". |
| rendered | JSF: If "false", this component is not rendered |
| style | HTML: CSS style rules to be applied to the component |
| styleClass | JSF: Assigns one or more CSS class names to the component. Corresponds to the HTML "class" attribute. |
| title | HTML: Advisory title information about markup elements generated for this component |
| width | HTML: Width of pop-up. Default value is "800". |
Table 6.55. Component identification parameters
| Name | Value |
|---|---|
| component-type | org.ajax4jsf.Log |
| component-family | org.ajax4jsf.Log |
| component-class | org.ajax4jsf.component.html.AjaxLog |
| renderer-type | org.ajax4jsf.LogRenderer |
To create the simplest variant on a page use the following syntax:
<a4j:log popup="false" level="ALL" style="width: 800px; height: 300px;"></a4j:log>
Then, in order to open a log window, press "CTRL+SHIFT+L" on a page with the component.
Example:
import org.ajax4jsf.component.html.AjaxLog;
...
AjaxLog myLog = new AjaxLog();
...
The <a4j:log > component generates JavaScript that opens a log window with useful debug information, which contains data on requests and responses, DOM tree changes et al. The log could be generated not only in a new window, but also on the current page in a separate <div> element. This feature is controlled with the component "popup" attribute. The window is opened on pressing of "CTRL+SHIFT+L", which is default registered key. The hot key could be changed with the "hotkey" attribute, where it's necessary to define one letter that together with "CTRL+SHIFT" opens a window.
The "level" attribute has several possible values "FATAL", "ERROR", "WARN", "INFO", "ALL" and is used when it is necessary to change a logging level.
Example:
<a4j:log level="ALL" popup="false" width="400" height="200"/>
The component defined this way is decoded on a page as <div> inside a page, where all the information beginning with informational message is generated.
<a4j:log> is getting renewed automatically after execution of Ajax requests. Do not renew <a4j:log> by using reRender!
Vizit the Log page at RichFaces LiveDemo for example of component usage and their sources.