How do I use jQuery s ajax method to fetch data from the database to populate an array? 30

.ajax({

url: '',type: 'get',datatype: 'xml',timeout: 1000,error: function(){

alert('error loading xml document');,success: function(xml){ The method that is executed when it returns normally.}

Do Something with XML return values can be written as strings or as XML.

It is best to write it in XML format and return it to JSP

There are many examples on this web that you can look for, and it's simple.

jQuery Ajax depends on the server language to query the database, jQuery can use $.post("url",,function(data));Of course, you can also use $ajax method to make asynchronous transfer requests.

Aren't you looking to query the database in the background? ajax is to do data interaction in the backend, you query this field in the background, use ajax interaction, and return the value you queried to the foreground, either return null or"", or return a valued;

Then write your logic in the success function of ajax, and it's OK; Do you know how to use ajax?

ajax(,error : function(result)

Of course, you can make an ajax request, and then you will do the corresponding operation according to the result of the request.

Your needs are not too clear,]

You can produce a JSON array like this.

var data=eval('(' + msg + ')');

alert(data[0].a);Take one....

The main ** ah, who knows how you wrote the amount?

1. Use alert(array) to see if the obtained array is [object], if not.

If the string of this array pops up;

2. Then var array=eval("("+array+")");

Re-array[0]["title"] to get it.

3. Generally, if the returned array is not in JSON format, then it needs to be converted to JSON format;

One way is to use eval() to deal with it, but I recommend that you convert the data to JSON format when PHP returns, so that the AJAX function can manipulate the data directly.

It's very simple, if the data is a string, then you just use the function eval

For example: var array = eval(data); And then you just use the array normally, and your data[0] above is array[0].

You can look at the jquery and it is very clear. Reference.

jQuery Ajax relies on the server language to query the database. jQuery can be used.

post("url",,function(data));

Of course, you can also use $ajax method to make asynchronous transfer requests.

There are many methods, which can be separated by commas, or you can use json (recommended).

Your needs are not too clear,]

You can produce a JSON array like this.

var data=eval('(' + msg + ')');

alert(data[0].a);Take one....

It can be done directly in this form.

Assumptions: 1. Your page is under web-root, and the content is:

The encoding used is UTF-8

2. Your servlet is: The mapping path is servlet helloworldservlet

Steps: 1. Introduction.

2. Write the click trigger function of the input box with ID as username

#username").keyup(function(),error: function()

3. Background processing of the received content:

utf-8");

string username = "username");

utf-8");

pringwriter out = ;

Note: 1. The encoding here is unified as UTF-8

2. Request path servlet helloworldservlet is a relative path, so your page must be under the web-root of the project (that is, under the default web folder, the name may change due to different project configurations).

3. No, remember to give points, typing is very hard