FAQ Topic - What are object models? (2010-03-21)
in [JavaScript]
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From: FAQ server on 20 Mar 2010 20:00 ----------------------------------------------------------------------- FAQ Topic - What are object models? ----------------------------------------------------------------------- Object models (OMs) are not part of the ECMAScript language; they are provided by the host to allow javascript (or other scripting language) to communicate with the host. An object model may allow javascript to access a file system (Mac, Windows, and Linux are all scriptable). The most common of all is the Document Object Model (DOM). Other document types such as SVG also define scriptable DOMs, mostly as extensions of the W3C Core DOM specification designed for use with XML documents. The complete comp.lang.javascript FAQ is at http://jibbering.com/faq/ -- The sendings of these daily posts are proficiently hosted by http://www.pair.com.
From: Peter Michaux on 21 Mar 2010 16:29 On Mar 20, 6:00 pm, "FAQ server" <javascr...(a)dotinternet.be> wrote: > ----------------------------------------------------------------------- > FAQ Topic - What are object models? > ----------------------------------------------------------------------- > > Object models (OMs) are not part of the ECMAScript language; they > are provided by the host to allow javascript (or other scripting > language) to communicate with the host. An object model may allow > javascript to access a file system (Mac, Windows, and Linux are all > scriptable). The most common of all is the Document Object Model (DOM). > Other document types such as SVG also define scriptable DOMs, > mostly as extensions of the W3C Core DOM specification designed for use > with XML documents. 1) This is not a frequently asked question. 2) Object models are an orthogonal concept to host objects. 3) Completely within ECMAScript, I can create my own set of objects that models a community of people. So object models are implicit in ECMAScript. I think this FAQ entry should be removed. Peter
From: Garrett Smith on 21 Mar 2010 18:02 Peter Michaux wrote: > On Mar 20, 6:00 pm, "FAQ server" <javascr...(a)dotinternet.be> wrote: >> ----------------------------------------------------------------------- >> FAQ Topic - What are object models? >> ----------------------------------------------------------------------- >> >> Object models (OMs) are not part of the ECMAScript language; they >> are provided by the host to allow javascript (or other scripting >> language) to communicate with the host. An object model may allow >> javascript to access a file system (Mac, Windows, and Linux are all >> scriptable). The most common of all is the Document Object Model (DOM). >> Other document types such as SVG also define scriptable DOMs, >> mostly as extensions of the W3C Core DOM specification designed for use >> with XML documents. > > 1) This is not a frequently asked question. > Right. > 2) Object models are an orthogonal concept to host objects. > Sure. > 3) Completely within ECMAScript, I can create my own set of objects > that models a community of people. So object models are implicit in > ECMAScript. > The organizing of abstractions is a larger role when developing a more sophisticated application. > I think this FAQ entry should be removed. > I see value in this entry in that it differentiates between the Host environment and built-ins. I also see value in the part of the answer to this question that emphasizes the "model" in Document Object Model. I see a lot of guys will try and traverse through the DOM to build their own "model", usually adding a large amount of additional code and overhead that otherwise could have been avoided. If the entry is removed, I would like to see a replacement for it. Potential alternative question: "What is a host object?" A potential alternative answer to the existing question could include a description of Object Modeling, covering some of the things mentioned, possibly mentioning "Domain Driven Design". Thoughts? -- Garrett comp.lang.javascript FAQ: http://jibbering.com/faq/
From: Peter Michaux on 21 Mar 2010 18:42 On Mar 21, 4:02 pm, Garrett Smith <dhtmlkitc...(a)gmail.com> wrote: > Peter Michaux wrote: > > On Mar 20, 6:00 pm, "FAQ server" <javascr...(a)dotinternet.be> wrote: > >> ----------------------------------------------------------------------- > >> FAQ Topic - What are object models? > >> ----------------------------------------------------------------------- > > >> Object models (OMs) are not part of the ECMAScript language; they > >> are provided by the host to allow javascript (or other scripting > >> language) to communicate with the host. An object model may allow > >> javascript to access a file system (Mac, Windows, and Linux are all > >> scriptable). The most common of all is the Document Object Model (DOM).. > >> Other document types such as SVG also define scriptable DOMs, > >> mostly as extensions of the W3C Core DOM specification designed for use > >> with XML documents. > > I think this FAQ entry should be removed. > If the entry is removed, I would like to see a replacement for it. > > Potential alternative question: > "What is a host object?" That is a way better question and the answer will be much more valuable. Peter
From: Garrett Smith on 22 Mar 2010 02:55
Peter Michaux wrote: > On Mar 21, 4:02 pm, Garrett Smith <dhtmlkitc...(a)gmail.com> wrote: >> Peter Michaux wrote: >>> On Mar 20, 6:00 pm, "FAQ server" <javascr...(a)dotinternet.be> wrote: >>>> ----------------------------------------------------------------------- >>>> FAQ Topic - What are object models? >>>> ----------------------------------------------------------------------- >>>> Object models (OMs) are not part of the ECMAScript language; they >>>> are provided by the host to allow javascript (or other scripting >>>> language) to communicate with the host. An object model may allow >>>> javascript to access a file system (Mac, Windows, and Linux are all >>>> scriptable). The most common of all is the Document Object Model (DOM). >>>> Other document types such as SVG also define scriptable DOMs, >>>> mostly as extensions of the W3C Core DOM specification designed for use >>>> with XML documents. > >>> I think this FAQ entry should be removed. > >> If the entry is removed, I would like to see a replacement for it. >> >> Potential alternative question: >> "What is a host object?" > > That is a way better question and the answer will be much more > valuable. > | A host object is an object supplied by the host environment to | complete the execution environment of ECMAScript. | | Examples of Host objects: `document`, `XMLHttpRequest`, and `alert`. -- Garrett comp.lang.javascript FAQ: http://jibbering.com/faq/ |