4.7. Primitive of the report formation (Document)
Support element of the report formation with the following properties is provided:
- Adaptive formation of a document structure based on Hypertext Markup Language. This provides support for the broad features of formatting of the documents.
- Formation of the documents on command or on schedule. It is necessary for creation of reports into the archive and then view the archive.
- Formation of a document in real time mode. It is necessary to form documents completely dynamically, and based on the archives for the specified time.
- Using of the the attributes of the widget for transmission of values and addresses to the archives in the report. It allows you to use the widget of the document as a template when generating reports with other input data.
The basis of any document is XHTML-template. XHTML-template is the tag "body" of the WEB-page which contains the document's static in the standard XHTML 1.0 and elements of the executable instructions in one of the languages of the user programming of OpenSCADA in the form of <?dp {procedure} ?>. The resulting document is formed by the execution of procedures and insert of their result into the document.
The source for values of the executable instructions are the attributes of the widget of the primitive, as well as all the mechanisms of the user programming language. Attributes may be added by the user and they can be linked to the actual attributes or parameters or they can be autonomous, values of which will be formed in the script of the widget. In the case of linked attributes the values can be extracted from the history, archive.
Fig. 4.7 shows the frame containing a sample of the document.
Fig.4.7. Implementation of the basic visualization element of the report documentation in the Vision.