Asp and simple AJAX applications
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Today, a reader friend asked me: ASP can be achieved AJAX? Of course, this is a relative comparison, the rookie questions, in fact, any site dynamic scripting language can be achieved AJAX, because AJAX itself is the concept of javascript, and used by the dynamic scripting language unrelated. So I decided to do a first Laijiangjiang ASP AJAX Application bar.
First speaking, what is AJAX, it is a written AJAX, and his name is Asynchronous JavaScript and XML, there is a Asynchronous "asynchronous", I mean, AJAX is "Asynchronous Javascript and XML," short. From the names we can clearly see, AJAX lies Javascrip and XML, "asynchronous" how stresses, it reflects a dynamic asynchronous request process, I will be here for his simple understanding, the website after the download is complete, then through Javascript sent to the remote server access to certain information and feedback from an act.
So, what is involved in AJAX technology to, first of all, need to use Javascript AJAX components to the xmlhttp and server communication, and secondly, through the XMLDOM need to know the return of xml data analysis methods, finally, also need to understand the basis of the data to change return Web certain Element method.
Nonsense here do not explain the theory of those boring, I will code-writing involved in the distribution of knowledge in the specific examples in on.
Wrote the above text, I would like to have been, relatively speaking examples of how could they do a good thing, here with a relatively simple AJAX "an article on" as a good example.
First make system outlined in the article shows that the page displays a text box and a button to when the submit button is clicked, the page will not refresh the data to the server, when after submission, the server will return a xml file to tell whether the current javascript successfully handled.
OK, the system outlined last night, and we probably under the terms of the database structure.
Field names
Field Types
Role
Remarks
ArticleID int article # primary key, since by ArticleTitle nvarchar (50) titles ArticleContent ntext article contentField names
Field Types
Role
Remarks
ArticleComentID int comment # primary key, since by ArticleID int article # foreign key ArticleCommentContent nvarchar (100) comment on the contentPage article has nothing to do I do not write the code, in order to simplify some of my Comments only comment on the content, and not to comment on what the nickname, the reason is the same, we can all cite one of the three. Comments related forms part of the code as follows:
<div> <h1> Comment on the article </ h1> <textarea Id="u-comment"> Please enter your comment! </ Textarea> <Input type = "button" onclick = "post (<= lArticleID%%") "value =" comment "/> </ Div> The above code is mainly to draw attention to two points: first, an article on the text box id "u-comment" and the second, when click the "comment" button, function post operation (< % = lArticleID% "). Note here actually embedded in an asp variables, we assume that the variables lArticleID asp inside is kept open the article, the current number, in addition to comments on the set add to the article under which, if the current article No. 574, here post the html code is (574). OK, on completion of the form, we look at this page javascript code.
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