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Chaining With the HTML Composer by Barry Solomon Form controls in the HTML Composer enable you to prompt users for a parameter value. Chaining is a function that builds a relationship between controls to allow associated control values to be populated based on the value selected and populated to a selected control. For example, if the sample CAR file is used, and the value of ENGLAND (for the COUNTRY control field) is selected, the CAR and MODEL controls would be populated to reflect only CARs and MODELs made in ENGLAND.
In this article, I will explain how to implement chaining by providing an example procedure (written in WebFOCUS) that has three parameters (CAR, COUNTRY and MODEL) in the WHERE clause that will be inserted into the HTML Composer page. The report uses the sample CAR file, which you can find in the ibisamp application folder. In this example, chaining will be used to build a relationship between the CAR, COUNTRY and MODEL controls.
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