About data validation anxious! anxious!

elsaelsa

table: id, chin_name, eng_name (N data in the table)
problem:
Enter the id through the web form (type = text). If there is no such id in the database table, the pop-up prompt will be similar: alert ("this" + id + "does not exist, please enter it again!");
If the database table has this id, there is no prompt, you can post.
How do I write this code? ? ? ?

elsaelsa

No one answered, depressed

boltcrank

AJAX can do it.

redist

Yep. . I am also a novice, but feel that you use sql to select the id and put it into an array, then use mysql_fetch_row, and then return the id in this array [index] according to the format of your database. If you have any, just post it. I do n’t know if you can use it. .

allenrun

.... If you do not use AJAX technology, you will not be able to access the server's database without POSTing data.

Because only after you submit the data, the server will respond to your request.

Of course, you can also save all the field IDs in the database when reading this page in advance, write the XML data format with PHP, and then use JAVASCRIPT to judge locally.

AJAX technology also works, this technology can directly access the server without POST. But I didn't do much research on this. Ha ha.

noendenergy

Everyone said that they can post data, which is also about traditional form submission.