Ajax: The Complete Reference by Thomas A. Powell

By Thomas A. Powell

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Rating=3&transport=image" />. In this particular case, observe that FIGURE 2-1 Snippet of saved user ratings Chapter 2: P r e - A j a x J a v a S c r i p t C o m m u n i c a t i o n s Te c h n i q u e s var img = new Image(); Next, the instantiated object’s src property would be set to the URL in question, making sure that the query string indicates the appropriate rating. src = url; That’s it, the communication is complete. Notice that it isn’t even required to include the returned image in the page at all.

Their inclusion is meant to drive home the fact that they should not be used. Two-way Style Sheet Communication As shown in the one-way communication patterns, it is simple to insert a linked style sheet in a page to transmit data in a query string to a server-side program. type = "text/css"; Chapter 2: P r e - A j a x J a v a S c r i p t C o m m u n i c a t i o n s Te c h n i q u e s You can also create a special dummy tag that data in the returned style sheet will be bound to. appendChild(dummyDiv); Once the request is sent, a timer is set to wake up every so often and check to see if the style sheet has been returned and bound data to the dummy tag.

Why this technology was ignored for years suddenly to be rediscovered is cause for great speculation and debate. Very likely, conservative industry conditions stemming from the dotcom meltdown around the turn of the century slowed adoption, but what changed this is less clear. It is the author’s opinion that Google’s Gmail, Yahoo’s purchase of Ajax pioneer Oddpost, and Microsoft’s Outlook Web Access for Exchange 2000 demonstrated to the world that a JavaScript-based Web application using partial page updates really could work for a large scale, public facing, mission critical application, in these particular cases, Web based e-mail.

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