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However, you are free to build arbitrary client-side HTML. As the namestaticHtml already indicates, the HTML needs to be static, meaning that changes to it on serverside are not possible. Once the HTMLIsland UI element gets displayed, HTMLcode is sent to the browser and JavaScript and style sheet sources are loaded. If youwant to create the HTML elements on client side, you should use HTMLIsland.The subsequent sections describe the three UI elements for HTML integration in more detail.2.2.1HTMLIslandHTMLIslands can define JavaScript and style sheet sources, and they contain a propertystaticHtml which can contain HTML code. If you want to build it on the server side, you should use HTMLContainer. Tocreate HTML on server side, the APIIF WD HTML WRITER should be usedTable 1: Comparison of HTMLIsland and HTMLContainerAs you can see, you can decide which UI element you want to use depending on the place where theHTML should be build. As aresult, the content of the HTMLContaineris rebuilt with each server roundtrip. TheHTMLIsland content remains stableon the client.HTMLContainerYou can integrate HTML or JavaScriptbased UI controls into your Web Dynproapplication (for example, an enhancedUI control for processing formatted text).You can enhance Web Dynpro UIelements with HTML (for example, add abackground image to a Table).HTML is created on the server side.
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Table 1 below shows the major differences between HTMLIslandand HTMLContainer.Application caseCreating HTMLHTMLIslandYou can embed interactive, statefulcontent (for example, charts) intoyour Web Dynpro applications.HTML is created on the client side.Only a static “anchor” HTML shouldbe placed in the HTMLIslandproperty staticHtml. HTMLFragments are usually used as part of HTMLContainersand contain a fragment of HTML. Web Dynpro HTMLIsland Developer Guide2.2HTMLIsland and related Web Dynpro UI ElementsThree UI elements can be used to integrate custom HTML in Web Dynpro ABAP: HTMLIsland,HTMLContainer and HTMLFragment. Communication from client to back end is realized by aJavaScript callback API. JavaScript calls can contain data as payload and they arecompiled in the back end via an ABAP API. The differences between HTMLIsland and HTMLContainer are described infurther detail in section 2.2 “HTMLIsland and related Web Dynpro UI Elements”.Communication between the back end system and the HTMLIsland or HTMLContainer instance on theclient (browser) is done via JavaScript calls. HTMLIslands contain static HTML, whereas HTMLContainershave an aggregation to content, which can be either HTML, Web Dynpro UI elements or acombination of both. These sources can be modelled in the back end as aggregations to therespective Web Dynpro UI element. They hold references toJavaScript and CSS sources. Web Dynpro HTMLIsland Developer Guide2ArchitectureThis section describes the architecture and technical aspects of the Web Dynpro UI elements used tointegrate custom HTML into Web Dynpro.2.1OverviewFigure 1 shows the general aspects of HTML integration:Figure 1: Overview of UI elements for HTML integrationBoth HTMLIsland and HTMLContainer are of type AbstractHTMLElement. If you plan todevelop such applications, please read SAP note 1742528. Please carefullyread section 3 “Restrictions” to ensure you meet all requirements when implementing HTMLIslands orHTMLContainers.To ensure that SAP product standards are fulfilled in Web Dynpro applications containingHTMLIslands and/or HTMLContainers, there are certain things you need to be aware of. Following the steps described in this section, you can build anapplication containing an HTMLIsland from scratch.There are certain restrictions when working with HTMLIslands and HTMLContainers.
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Section 2.2 “HTMLIsland and related Web Dynpro UI Elements”describes these UI elements related to HTML integration in detail.Section 3.1 “Creating an HTMLIsland” includes a step-by-step description on how to integrate anHTMLIsland into Web Dynpro ABAP. The relevant UI elements are HTMLIsland,HTMLContainer and HTMLFragment. Web Dynpro HTMLIsland Developer Guide1IntroductionWeb Dynpro provides UI elements that allow integration of custom HTML, custom JavaScript, andcustom CSS into a Web Dynpro application. Web Dynpro HTMLIsland Developer GuideContents1 Introduction 32 Architecture 42.12.2Overview 4HTMLIsland and related Web Dynpro UI Elements 53 Development 73.13.23.33.4Creating an HTMLIsland 7Security Notes 22Naming conventions and namespaces 24Restrictions 25 Copyright SAP AG 2012 of 25 Authors:Klaus KellerLisa MonshausenDeveloper GuidelineWeb DynproHTMLIsland &HTMLContainerVersion StatusDate1.0FinalReviewed/Approved at / by