Tabular presentation and color codes are used to highlight important points in the book. Every technique is followed by general guidelines to implement the same. Plenty of exercises accompany every topic, letting the reader practise problem solving and thereby master the concept. Several test papers and corresponding. Salient features: Step-by-step approach towards Mathematical Calculation; Simple and Easy techniques to Facilitate Understanding; Important points highlighted by use of different colours and tabular presentation; General Guidelines after each technique; More than 500 solved example to make the concepts very clear.

By – July 7, 2006 Scope: Acrobat Professional 6.0 and greater Skill Level: Beginner Prerequisites: Familiarity with Acrobat Professional, the JavaScript Console, and the Acrobat JavaScript Reference. Many forms have optional sections. To keep the user focused on only those parts of the form they need to fill out, and to keep them from being confused, it is often useful to hide some form fields. This tip shows how to design a form using to show and hide form fields based on user actions. The Basics of Field Visibility A form field on a PDF document can be visible in the PDF viewer (i.e. Acrobat, Reader), on the printed document, or both. The Acrobat JavaScript DOM provides three different Field Object properties for controlling these options, listed in the table below.

Description display.visible 0 Field Visible in Viewer and Print display.hidden 1 Field Hidden in Viewer and in Print display.noPrint 2 Field Visible in Viewer, Hidden on Print display.noView 3 Field Hidden in Viewer, Visible on Print Examples All examples are provided in Sample_ShowHideFields.pdf Setting Field Visibility based on a Single Check Box Setting Probably the simplest case for setting field visibility is a single check box. When checked, some other fields are made visible and when unchecked the fields are hidden. In the first example of the sample file a check box is used to display a set of fields for entering additional info.

Notice that not only are the entry fields made visible, but visibility of the field labels is also controlled. The field labels are really read-only text fields. In general, there are two locations where the visibility code can be placed; in the field that triggers the visibility change or the field that receives the visibility change. Which location is best depends on the specific situation. For this sample, multiple fields receive the change, but only a single field (the Check Box) is used as the trigger.

The easiest approach is to use the Mouse Up event for the Check Box. This particular event is used because it happens after the value of the Check Box has been updated.

The Mouse Down event would not work because it happens before the Check Box value is changed. A segment of the code is shown below. Var nHide = event.target.isBoxChecked(0)?display.visible:display.hidden; this.getField('LblShippingInfo').display = nHide; this.getField('LblShippingStreet').display = nHide; this.getField('ShippingStreet').display = nHide; The first line determines the visibility by examining the state of the check box with the event.target.isBoxChecked(0) function. The first part of this code, event.target, refers to the target of the event, which is the Check Box. The argument to the function isBoxChecked() is a 0, which refers to the first instance of the checkbox. If there were several Check Boxes with the same name this argument would be used to distinguish between them.

The true/false return value of this function is then used to select the visibility state with the Conditional Operator, i.e., the question mark operator. This operator is equivalent to using an if statement. The additional lines of code simply apply the visibility state to the appropriate fields. Setting Field Visibility based on a Radio Button Setting One characteristic of Radio Buttons is that the user can only turn a button on.

The buttons are turned off automatically when the user makes another selection. This characteristic simplifies the code for showing and hiding fields in Sample #2. In this sample there are two Radio Buttons, one hides the fields and one shows the fields. Since it is a given when the user clicks on a button that button will be selected, there is no need for code to determine the state of the selection. Each button has a script in the Mouse Up event.

The script for the Married Radio Button assigns display. How Much Do Monster Truck Drivers Make A Year on this page. visible to each of the fields in the Spouse Information block, and the script for the Single Radio Button assigns display.visible to these same fields. As well as the fields and field labels, the Spouse Information block includes a gray background that contains and highlights the Spouse Information fields. There are several different ways to create this effect depending on the form developer’s skill level and tools available. For example, it could be an OCG, a Text Field, or a Stamp Annotation. In this example a Square Markup Annotation is used.

All annotations have a hidden property that works in exactly the same way as the deprecated hidden property for a field. Using it is simply a matter of being able to acquire the annotation object. The easiest way to do this is to acquire the annotation by name, which is how it is done in the example code with the following line.

This.getAnnot(0,'SpouseInfoBlk').hidden = false; However, unlike fields, annotations created from the user interface are given very cryptic, auto-generated names. There is no way to access the annotation name from the Acrobat user interface. Giving the annotation a reasonable (human readable) name, has to be done with JavaScript. When this sample was created the background annotation was the only annotation on the PDF, simplifying the situation considerably.

Its name was changed by executing the following line of code in the JavaScript Console. This.getAnnots(0)[0].name = “SpouseInfoBlk”; The getAnnots() function returns an array of annotation objects for the specified page.

Since we know there is only one annotation on the page, the [0] notation is sufficient. If there were more annotations, a little more work is required to identify the correct one.

Setting Field Visibility based on “Radio Check Box” Settings Check Boxes can be made to act similar to Radio Buttons. This is done by giving a set of Check Boxes the same field name, and giving each a different export value. The difference between this setup and real Radio Buttons is the Check Boxes can be turned off, allowing the user the choice of not selecting any options. With Radio Buttons, once a selection is made it cannot be cleared.

We’ll call this merged control a “Radio Check Box”. Sample #3 uses “Radio Check Boxes” to implement the selection of a title, the advantage being that users do not have to select a title at all if they don’t want to. Selecting the last option, Other, displays a single text field for entering a custom title. Since there are four Check Boxes and the user can turn off this option from any one of them, we might conclude that a script should be placed in the Mouse Up event for each button, but this is inefficient since we’d be repeating the same code for each. Instead, this example uses an event common to all the Check Boxes, the Validate event.

This event is called whenever any of the Check Boxes change value. Unfortunately, the script for the Validate event cannot be entered from the Acrobat user interface, it can only be accessed from JavaScript with the field.setAction() function. The code for setting up this Validate event is run from the JavaScript Console. It is available in the sample file and also shown below.

Var strJS = 'this.getField('OtherTitle').display =’ + ‘(event.value == 'Other')?display.visible:display.hidden;'; this.getField('Title').setAction('Validate',strJS); The first two lines of code build a string version of the Validate script. This script is a single line of code. It’s only function is to set the OtherTitle field to visible when the export value from the Check Boxes is “Other”. The third line of code sets Validate event script for the Title field, which is the name given to all of the “Radio Check Boxes”. Setting Field Visibility based on Valid Form Data In Sample #4 a Submit Button is made visible only when all required field data is entered. This same technique could also be used to make a Signature field visible. The general idea is that the hidden field represents the last thing the user is supposed to do.

The field is hidden until everything is ready. The code for showing the hidden button is more complex than that given in previous examples because it has to check every field on the form. The logical place to put such a script is in a Calculate event since this type of event is triggered anytime a change is made to any field on the form, providing a way to continuously check all the fields. Both the Button and Signature fields have a Calculate event that can be set through JavaScript in the same way the Validate script was set in Sample #3. However, the complexity of a script that checks all the other fields on the document makes this methodology awkward. It is much better to have this script in a location where it can be easily debugged and changed.

For this reason, the script is placed in the Calculate event of a special hidden Text field. The Text field was added to the form solely for the purpose of allowing us to use a Calculate event for which we have easy access to script. The script itself, shown below, is written in an easy to read manor to simplify debugging and future changes. Var bReady = true; if(this.getField('FormName').value.length == 0) bReady = false; else if(this.getField('FormAddress').value.length == 0) bReady = false; else if(this.getField('FormEmail').value.length == 0) bReady = false; if(bReady) this.getField('DoSubmit').display = display.visible; else this.getField('DoSubmit').display = display.hidden; At the top of the script the bReady variable is defined and defaulted to true.

The following code tests each form field to see if data has been entered into it and sets bReady to false only if the test fails. In a real form these tests would most likely be more complex. For example, if the form contains optional or conditional sections, then it might be necessary to first test a Check Box, Radio Button, or other conditions before testing the fields in the section. At the age of 84 I am struggling to understand or to write Javascript for a PDF form, I have got most of it sorted and working but stuck on the following. I have two check boxes, same name different values, I will call them A & B. They both appear unchecked when the form is opened. Box A is checked to agree a written statement It has no other function.

Box B when checked, unchecks box A I also want box B when checked to hide an inserted picture and at the same time show six text boxes which are hidden. I have tried copying and pasting script from various sources and concentrating on the text boxes, including copying script from this tutorial, but nothing works.

I might add that the program I am using is PDFill which saves to adobe and the help they give is next to none. The inserted picture does not have a field name but in it’s properties box there is a provision for linking, action, etc. Can you make any suggestions please.

Animation of an with transparent background Transparency is possible in a number of graphics file formats. The term transparency is used in various ways by different people, but at its simplest there is 'full transparency' i.e. Something that is completely invisible. Of course, only part of a graphic should be fully transparent, or there would be nothing to see. More complex is 'partial transparency' or 'translucency' where the effect is achieved that a graphic is partially transparent in the same way as colored glass. Since ultimately a printed page or computer or television screen can only be one color at a point, partial transparency is always simulated at some level by mixing colors.

There are many different ways to mix colors, so in some cases transparency is ambiguous. In addition, transparency is often an 'extra' for a graphics format, and some graphics programs will ignore the transparency. File formats that support transparency include,,,, and, through either a transparent color or an.

Most formats implicitly support transparency because they simply avoid putting any objects at a given point. This includes and. For vector graphics this may not strictly be seen as transparency, but it requires much of the same careful programming as transparency in raster formats. More complex vector formats may allow transparency combinations between the elements within the graphic, as well as that above.

This includes and. A suitable shows transparency by a special pattern, e.g. A checkerboard pattern. This image has binary transparency (some pixels fully transparent, other pixels fully opaque). It can be transparent against any background because it is monochrome. One color entry in a single GIF or PNG image's palette can be defined as 'transparent' rather than an actual color. This means that when the decoder encounters a pixel with this value, it is rendered in the background color of the part of the screen where the image is placed, also if this varies pixel-by-pixel as in the case of a background.

Applications include: • an image that is not rectangular can be filled to the required rectangle using transparent surroundings; the image can even have holes (e.g. Be ring-shaped) • in a run of text, a special symbol for which an image is used because it is not available in the character set, can be given a transparent background, resulting in a matching background. The transparent color should be chosen carefully, to avoid items that just happen to be the same color vanishing. Even this limited form of transparency has patchy implementation, though most popular web browsers are capable of displaying transparent GIF images. This support often does not extend to printing, especially to printing devices (such as ) which do not include support for transparency in the device or driver. Outside the world of web browsers, support is fairly hit-or-miss for transparent GIF files. Edge limitations of transparent pixels [ ].

This image has binary transparency. However, it is grayscale, with, so it looks good only against a white background. Set against a different background, a 'ghosting' effect from the shades of gray would result. The edges of characters and other images with transparent background should not have: these are normally used for intermediate colors between the color of the letter/image and that of the background, typically shades of gray being intermediate between a black letter and a white background. However, with, for example, a red background the intermediate colors would be dark red. Gray edge pixels would give an ugly and unclear result. For a variable background color there are no suitable fixed intermediate colors.

Partial transparency by alpha channels [ ]. This image has partial transparency (254 possible levels of transparency between fully transparent and fully opaque). It can be transparent against any background despite being anti-aliased. PNG and TIFF also allows partial transparency, which solves the edge limitation problem.

Download Timeline Template Omni Graffle License. However, support is even more patchy. Prior to version 7 does not support partial transparency in a PNG graphic. Very few applications correctly process TIFF files with alpha channels. A major use of partial transparency, but not the only one, is to produce 'soft edges' in graphics so that they blend into their background. See also and.

The process of combining a partially transparent color with its background ('compositing') is often ill-defined and the results may not be exactly the same in all cases. For example, where color correction is in use, should the colors be composited before or after color correction?