selectvalueflowtag.java

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package net.java.workeffort.infrastructure.jsptags;

import java.util.Locale;

import javax.servlet.jsp.JspException;

import net.java.htmltag.BaseInputTag;

import org.apache.commons.lang.StringUtils;
import org.springframework.ui.context.Theme;
import org.springframework.web.util.ExpressionEvaluationUtils;

/**
 * Set value of field using page flow.
 * <p>
 * The image is picked up from the theme properties file. This file should have
 * an entry for 'pageFlowLov.img' See workeffort.tld for attribute details.
 * @author Antony Joseph
 */

public class SelectValueFlowTag extends BaseInputTag {

    /**
     * @see javax.servlet.jsp.tagext.Tag#doStartTag()
     */
    public int doStartTagInternal() throws JspException {
        setReadonly(ExpressionEvaluationUtils.evaluateString("readonly",
                getReadonly(), pageContext));
        setDisabled(ExpressionEvaluationUtils.evaluateString("disabled",
                getDisabled(), pageContext));

        // set the type of the input element.
        setType("text");
        StringBuffer js = new StringBuffer();

        // The onclick should be rendered on the accompanying button of the
        // page flow lov and *not* the text field.
        String valOnclick = getOnclick();
        setOnclick(null);
        // render the text field.
        js.append(renderInputElement());

        valOnclick = ExpressionEvaluationUtils.evaluateString("onclick",
                valOnclick, pageContext);

        // render the accompanying button
        //js.append("\n<input type=\"button\" onclick=\"");

        js.append("\n<input type=\"image\" src=\"");
        js.append(getImageSrc());
        js.append("\" onclick=\"");
        js.append(valOnclick);
        js.append("\"");
        // disable the button as needed
        if ("true".equals(getReadonly()) || "true".equals(getDisabled())) {
            js.append(" disabled=\"disabled\" ");
        }
        js.append(" id=\"");
        js.append(createLovBtnId());
        js.append("\"");
        js.append("/>\n");
        write(js.toString());

        return SKIP_BODY;
    }

    private String createLovBtnId() {
        String property = getProperty();
        return StringUtils.replaceChars(property, "[].", null) + "SelectValue";
    }

    /**
     * @return Returns the errorStyleClass.
     */
    public String getErrorStyleClass() {
        return (getStyleClass() == null) ? null : getStyleClass() + "Error";
    }

    private String getImageSrc() {
        Locale locale = getRequestContext().getLocale();
        Theme theme = getRequestContext().getTheme();
        if (theme != null)
            return theme.getMessageSource().getMessage("pageFlowLov.img", null,
                    locale);
        else
            return null;
    }
}