Examples of org.apache.click.Control

org.apache.click.Control
Provides the interface for Page controls. Controls are also referred to as components or widgets.
When a Page request event is processed Controls may perform server side event processing through their {@link #onProcess()} method. Controls are generallyrendered in a Page by calling their toString() method.
The Control execution sequence is illustrated below:

HTML Header Imports
Control HTML header imports can be exposed by overriding the {@link #getHtmlImports()} method.
For example a custom TextField control specifies that the custom.js file should be included in the HTML header imports:
```
 public class CustomField extends TextField { protected static final String HTML_IMPORT = "<script type=\"text/javascript\" src=\"{0}/click/custom.js\"></script>\n"; public String getHtmlImports() { String[] args = { getContext().getRequest().getContextPath() }; return MessageFormat.format(HTML_IMPORTS, args); } .. } 
```
Please note multiple import lines should be separated by a '\n' char, as the {@link org.apache.click.util.PageImports} will parse multiple import lineson the '\n' char and ensure that imports are not included twice.
Deploying Resources
The Click framework uses the Velocity Tools WebappLoader for loading templates. This avoids issues associate with using the Velocity ClasspathResourceLoader and FileResourceLoader on J2EE application servers. To make preconfigured resources (templates, stylesheets, etc.) available to web applications Click automatically deploys configured classpath resources to the /click directory at startup (existing files will not be overwritten).
To enable Controls to deploy static resources on startup this interface provides an {@link #onDeploy(ServletContext)} method.
Continuing our example the CustomField control deploys its custom.js file to the /click directory:
```
 public class CustomField extends TextField { .. public void onDeploy(ServletContext servletContext) { ClickUtils.deployFile (servletContext, "/com/mycorp/control/custom.js", "click"); } } 
```
Controls using the onDeploy() method must be registered in the application WEB-INF/click.xml for them to be invoked. For example:
```
 <click-app> <pages package="com.mycorp.page" automapping="true"/> <controls> <control classname="com.mycorp.control.CustomField"/> </controls> </click-app> 
```
When the Click application starts up it will deploy any control elements defined in the following files in sequential order:
- /click-controls.xml
- /extras-controls.xml
- WEB-INF/click.xml
Click also supports an alternative deployment strategy which relies on packaging resource (stylesheets, JavaScript, images etc.) following a specific convention. See the section Deploying Custom Resources for further details.
Please note {@link org.apache.click.control.AbstractControl} providesa default implementation of the Control interface to make it easier for developers to create their own controls. @see org.apache.click.util.PageImports

     * @see org.apache.click.Control#onRender()
     */
    public void onRender() {
        if (hasControls()) {
            for (int i = 0, size = getControls().size(); i < size; i++) {
                Control control = (Control) getControls().get(i);
                control.onRender();
            }
        }
    }

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     * @param buffer the buffer to append the output to
     */
    protected void renderChildren(HtmlStringBuffer buffer) {
        if (hasControls()) {
            for (int i = 0; i < getControls().size(); i++) {
                Control control = (Control) getControls().get(i);


                int before = buffer.length();
                control.render(buffer);
                int after = buffer.length();
                if (before != after) {
                    buffer.append("\n");
                }
            }

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     * @param buffer the buffer to append the output to
     */
    protected void renderChildren(HtmlStringBuffer buffer) {
        if (hasControls()) {
            for (int i = 0; i < getControls().size(); i++) {
                Control control = (Control) getControls().get(i);


                int before = buffer.length();
                control.render(buffer);


                int after = buffer.length();
                if (before != after) {
                    buffer.append("\n");
                }

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     * Please note this is a HTML limitation and is not due to Click.
     *
     * @return true if the Field is disabled
     */
    public boolean isDisabled() {
        Control control = this;


        // Check parents for instances of either FieldSet or Form
        while (control.getParent() != null && !(control.getParent() instanceof Page)) {
            control = (Control) control.getParent();
            if (control instanceof FieldSet) {
                FieldSet fieldSet = (FieldSet) control;
                if (fieldSet.isDisabled()) {
                    return true;
                } else {

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     * if the parent FieldSet or Form is readonly.
     *
     * @return true if the Field is a readonly
     */
    public boolean isReadonly() {
        Control control = this;


        // Check parents for instances of either FieldSet or Form
        while (control.getParent() != null && !(control.getParent() instanceof Page)) {
            control = (Control) control.getParent();
            if (control instanceof FieldSet) {
                FieldSet fieldSet = (FieldSet) control;
                if (fieldSet.isReadonly()) {
                    return true;
                } else {

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        boolean continueProcessing = true;


        if (hasControls()) {
            for (Iterator it = getControls().iterator(); it.hasNext();) {
                Control control = (Control) it.next();
                if (!control.onProcess()) {
                    continueProcessing = false;
                }
            }
        }

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     * @see org.apache.click.Control#onDestroy()
     */
    public void onDestroy() {
        if (hasControls()) {
            for (int i = 0, size = getControls().size(); i < size; i++) {
                Control control = (Control) getControls().get(i);
                try {
                    control.onDestroy();
                } catch (Throwable t) {
                    ClickUtils.getLogService().error("onDestroy error", t);
                }
            }
        }

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    */
    public void onInit() {
        super.onInit();
        if (hasControls()) {
            for (int i = 0, size = getControls().size(); i < size; i++) {
                Control control = (Control) getControls().get(i);
                control.onInit();
            }
        }
    }

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    * @see org.apache.click.Control#onRender()
    */
    public void onRender() {
        if (hasControls()) {
            for (int i = 0, size = getControls().size(); i < size; i++) {
                Control control = (Control) getControls().get(i);
                control.onRender();
            }
        }
    }

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     */
    public String getHtmlImports() {
        if (hasControls()) {
            HtmlStringBuffer buffer = new HtmlStringBuffer(0);
            for (int i = 0, size = getControls().size(); i < size; i++) {
                Control control = (Control) getControls().get(i);
                String htmlImports = control.getHtmlImports();
                if (htmlImports != null) {
                    buffer.append(htmlImports);
                }
            }
            return buffer.toString();

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Related Classes of org.apache.click.Control

org.apache.click.control.AbstractContainer

org.apache.click.control.Field

org.apache.click.control.FieldSet

org.apache.click.control.Form

org.apache.click.control.Panel

org.apache.click.control.Table

org.apache.click.examples.control.exporter.TableExportContainer

org.apache.click.extras.control.AbstractContainerField

org.apache.click.extras.control.HtmlFieldSet

org.apache.click.extras.control.HtmlForm

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Examples of org.apache.click.Control

HTML Header Imports

Deploying Resources

Related Classes of org.apache.click.Control