PDFlib Cookbook

cookbook

form_fields/form_textfield_input_check

Check whether the date entered in a form field of type "textfield" has been formatted correctly.

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/*
 * Form text field input check:
 * Check if the date entered in a form field of type "textfield" has been
 * formatted correctly.
 * 
 * Create a text field for displaying a date and check if the input has been
 * correctly formatted as "mmm dd yyyy, e.g. "Oct 12 2018". 
 * 
 * Required software: PDFlib/PDFlib+PDI/PPS 9
 * Required data: none
 */
package com.pdflib.cookbook.pdflib.form_fields;

import com.pdflib.pdflib;
import com.pdflib.PDFlibException;

public class form_textfield_input_check
{
    public static void main (String argv[])
    {
        /* This is where the data files are. Adjust as necessary */
        String searchpath = "../input";
        String outfile = "form_textfield_input_check.pdf";
        String title = "Form Text Field Input Check";
        
        pdflib p = null;
        int exitcode = 0;

        String optlist;
        int font, monospaced_font;
        double fontsize, ascender, descender;
        double width=160, height=30, llx = 10, lly = 700;

        try {
            p = new pdflib();

            /* This means we must check return values of load_font() etc. */
            p.set_option("errorpolicy=return");

            p.set_option("searchpath={" + searchpath + "}");

            if (p.begin_document(outfile, "") == -1)
                throw new Exception("Error: " + p.get_errmsg());

            p.set_info("Creator", "PDFlib Cookbook");
            p.set_info("Title", title);

            font = p.load_font("Helvetica", "winansi", "");
            if (font == -1)
                throw new Exception("Error: " + p.get_errmsg());
            
            monospaced_font = p.load_font("Courier", "winansi", "");
            if (monospaced_font == -1)
                throw new Exception("Error: " + p.get_errmsg());
            
            /* Start page */
            p.begin_page_ext(0, 0, " width=a4.width height=a4.height");
            
            /* Adjust the font size to match the field height. Then, descrease the
             * font size by e.g. 20% to leave some empty space from the field
             * borders.
             */
            ascender = p.info_font(monospaced_font, "ascender", "fontsize=" +
                height);
            descender = p.info_font(monospaced_font, "descender", "fontsize=" +
                height);
            fontsize = (ascender - descender) * 0.8;
            
            /* For a correct formatting of the date, define a keystroke and a
             * formatting action for the date to be checked for compliance to the
             * format "mmm dd yyyy". 
             */
            int keystroke_action = p.create_action("JavaScript",
                "script={AFDate_KeystrokeEx('mmm dd yyyy'); }");
     
            /* Create a form field of type "textfield" called "date" with the
             * JavaScript action supplied in the "action" option
             */
            optlist = "backgroundcolor={rgb 0.95 0.95 1} bordercolor={gray 0} " +
                "currentvalue={Oct 12 2018} maxchar=11 comb=true " +
                "scrollable=false tooltip={Enter a date} font=" + monospaced_font + 
                " fontsize=" + fontsize +
                " action={keystroke=" + keystroke_action + "}";
                  
            p.create_field(llx, lly, llx + width, lly + height, "date", "textfield",
                optlist);
            lly-=40;
            
            p.setfont(font, 12);
            p.fit_textline("Change the date.", llx, lly, "");
            p.fit_textline("After pressing \"Enter\", the date is checked to be " +
                "correctly formatted as \"mmm dd yyy\".", llx, lly-=20, "");
            
            p.end_page_ext("");
            
            p.end_document("");

        } catch (PDFlibException e) {
            System.err.println("PDFlib exception occurred:");
            System.err.println("[" + e.get_errnum() + "] " + e.get_apiname()
                + ": " + e.get_errmsg());
            exitcode = 1;
        } catch (Exception e) {
            System.err.println(e);
            exitcode = 1;
        } finally {
            if (p != null) {
                p.delete();
            }
            System.exit(exitcode);
        }
    }
}