Ajax implements page loading and content deletion, and ajax implements page loading
The biggest advantage of ajax is that it does not jump to pages during loading or deletion. Most of the current web pages are written using ajax, which reduces the amount of code compared to embedded PHP code, at the same time, loading the page will be faster. The following is how to use ajax to write the loading page and delete the fruit using the database fruit table as an example. At the beginning, ajax may be quite easy to write, it should be a good exercise.
Here is the fruit table:
The following is the homepage code. First, create a php file main. php.
<Body>I chose to display only the fruit name Price and origin columns in the fruit table on the page. Next we will write the loading processing page and create a php file named jiazaiym. php.
<? Phpinclude ("DADB. class. php "); $ db = new DADB (); $ SQL =" select * from fruit "; $ arr = $ db-> Query ($ SQL ); $ str = ""; foreach ($ arr as $ v) {$ str = $ str. implode ("^", $ v ). "|"; // use "|" to connect each row, so that an extra "|"} $ str = substr ($ str, 0, strlen ($ str) -1); // Delete the last extra "|" in the string truncation mode echo $ str;?>After loading the Page code, you can officially write ajax, which should be written in main. php.
<Script type = "text/javascript"> $. ajax ({url: "jiazaiym. php ", dataType:" TEXT ", success: function (data) {var str =" "; var hang = data. split ("|"); for (var I = 0; INote:When writing ajax, pay special attention to the semicolons and commas in them. I always write them as semicolons and the results cannot be output. After checking that the code is correct, this is a headache.
After loading the page, we will start writing and deleting the page. It is very easy to delete the page by creating the php file shanchu. php, which is similar to embedding php directly.
<?php$ids=$_POST["ids"];include("DADB.class.php");$db=new DADB();$sql="delete from fruit where ids={$ids}";if($db->Query($sql,0)){ echo"OK";}else{ echo"flase";}Next, when I want to re-write an ajax file, I will find that the file is not run after it is written, because the class in the file is not recognized when the page is loaded, in this case, I need to put the deletion in the loaded ajax, and encapsulate the loading into a method. I can call the method when deleting it.
<Script type = "text/javascript"> Load (); function Load () {$. ajax ({url: "jiazaiym. php ", dataType:" TEXT ", success: function (data) {var str =" "; var hang = data. split ("|"); for (var I = 0; IIn this way, there is no problem.
The above is all the content of this article. I hope it will be helpful for your learning and support for helping customers.
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