FotoWeb 6.0 User Guide - Customization - FotoWare

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Customizing FotoWeb 3.0 2.3.5.3 Existence of variables It is important to know that a variable must exist before you can access its value. If an attempt is made to access a variable that does not exist, then the entire processing is stopped and an error is generated. It is not always clear in the context when a certain variable may exist or not. To cope with such situations, FotoWeb provides following set of tags to check for existence of variables on different levels: • IfVariableExists • IfNotVariableExists • IfHttpRequestValueExists • IfNotHttpRequestValueExists All these tags use a ‘name’ attribute to specify the name of the variable to be checked. In addition, these are nonempty tags that perform an evaluation and allow execution of their context accordingly. For example: Client platform: Example 15: Checking if a variable exists. In this example, we check if a variable named ‘browser.paltformName’ exists. If it does, then the context of the ‘IfVariableExists’ is executed and the client’s platform name is displayed, otherwise the entire context is skipped. Similarly, a code section can be created for execution in absence of a variable. For example: Client platform is not available. Example 16: Checking if a variable does not exist. In this example the context of ‘IfNotVariableExists’ is executed only if ‘browser.platformName’ does not exist. 2.3.5.4 Creating own variables FotoWeb also allows creating your own variables for easy data access throughout the Fwx pages. The tags used to achieve this are: • SetVariable • SetSessionVariable For example: Example 17: Creating custom variables in the page scope. In this example a variable named ‘productName’ is declared with a specified value. This variable can now be accessed anywhere in the Fwx page in any context. However, once another page is processed, this variable is no longer valid. To declare variables that are valid and accessible through all pages, you can use the ‘SetSessionVariable’ tag. This tag sets a session variable that only needs to be declared once and is available during the entire user session. A session variable is recognized with a special prefix ‘UDSV_’, which stands for User Defined Session Variable. For example: Example 18: Creating custom variables in the session scope. In this example a session variable ‘UDSV_productName’ is declared that will be available throughout the user session in any context. The externally set variables can be removed from the memory when they are no longer needed with the ‘RemoveVariable’ and ‘RemoveSessionVariable’ tags. For example: 10 / 47 FotoWare
Example 19: Removing custom variables. In this example the externally set variable ‘productName’ is removed from the memory. 2.3.6 Conditions Customizing FotoWeb 3.0 Conditions are the true/false evaluations points for the tags and externally set conditions. The conditions allow creating contexts of codes that can be chosen for execution in different situations. 2.3.6.1 Types of conditions The conditions can be divided into three categories: 1. Global conditions • Conditions that belong to ‘Global’, ‘CurrentUser’ and ‘BrowserDetection’ tags are called global conditions. These conditions can be accessed anywhere in the page without calling the tags or creating a tag context. 2. Tag conditions • Conditions set by a tag. These conditions must be used within the tag’s context. 3. External conditions • Conditions that are set manually by the programmer. These conditions can be used anywhere in the page after they are set. They behave similar to global conditions. FotoWare 11 / 47
Page 1 and 2: Customizing FotoWeb 6.0 Copyright (
Page 3 and 4: 1 Introduction Customizing FotoWeb
Page 5 and 6: 2.2 Scripting in FotoWeb Customizin
Page 7 and 8: 2.3.1 Empty tags Customizing FotoWe
Page 9: Customizing FotoWeb 3.0 Since the v
Page 13 and 14: 2.3.6.3 Existence of conditions Cus
Page 15 and 16: 2.5 Include files Customizing FotoW
Page 17 and 18: 2.6.3 Avoid illegal peers Customizi
Page 19 and 20: 2.7.1.1 Script (template) selection
Page 21 and 22: 2.7.2 Validating the templates Cust
Page 23 and 24: 2.7.2.2 Manually edit templates Cus
Page 25 and 26: 3.2 Adding the first tag Now that w
Page 27 and 28: Next, we will evaluate a condition
Page 29 and 30: 3.3 Adding ‘ImageList’ tag Cust
Page 31 and 32: Customizing FotoWeb 3.0 Next we wil
Page 33 and 34: 3.4 Displaying images Customizing F
Page 35 and 36: Customizing FotoWeb 3.0 Next, we wa
Page 37 and 38: Customizing FotoWeb 3.0 Note that w
Page 39 and 40: Screenshot 23: Improving page navig
Page 41 and 42: Example 48: Special archive with sp
Page 43 and 44: 4.5 Displaying navigation informati
Page 45 and 46: 5.1.3 Examples We start by looking
Page 47: Customizing FotoWeb 3.0 Example 20:

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