xml format:
Browsers have xml data read method, various analytical methods provided by different browsers.
Now Ajax technology, data is transmitted to the server using a clientJSONformat.
Js Json format is a standard format that all browsers support.
Input data validation is completed (synchronization request) by lost focus event
After a user name input, mouse out when it is judged that the input format
写servlet
This will result in a non-compliance after the first judgment, the page will refresh, enter the back no more.
By ajax, asynchronous way to send a request to get
In this case, after the judgment does not meet the first page does not refresh, enter the back remains.
In their own time to step on the test pit: jquery previous import statements are a direct copy of today write their own url, found
here to add a slash. Otherwise, the package can not be found
Ajax underlying code (native code):
JavaScript send asynchronous requests, you need a core object XMLHttpRequest, but different in different browsers ground floor, so we can create a core object.
If you use the Post method, you need to change:
The use of a post request: one only needs to change.
This sentence acquisition request by the servlet type inside.
Json format:
Standard json format:
It means a single array
a plurality of array means json
concept JS not set, instead of using an array
to traverse the array:
Ajax request server, the server responds a json string.
The above is a first double escape into the single quote
The second method is to write directly in single quotes inside double quotes.
Because the server is passed over a json string, instead of json data we want, so to get rid of double quotation marks:
method of removing the double quotation marks:
Application:
This will remove the double quotes. Json data into a standard, then operation.
Examples of the full version:
The actual use of time and then does not need to define json but will be reflected directly. Well. How json is constructed?
Using third-party jar package.
Of Ajax provinces, municipalities and two linkage.
1. The establishment of a database and put the data.
There is a problem, insert after the establishment of the foreign key table does not work well, so use sql query to create a second table, the establishment of a foreign key
2. Establish a connection to the database connection pool c3p0.
3. Establish bean class.
4. Establish dao layer, set the query.
- There is no written business layer in order to save, write directly servlet
6. Edit the jsp page.
Here two drop-down boxes to set a id. After the time for delivery to the data entered by ajax good to find this node splicing
success.
jQuery's each method:
element here, and should correspond to the following:
