1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 | <!DOCTYPE html> <html> <head> <title>lab 20</title> </head> <body id="body"> <form name="f" action="http://maps.google.com/maps" method="get" onsubmit="return check()"> Search: <input id="cord" type="text" name="q" value=""> <input type="submit" value="Go"> </form> <script> function check(){ var cordRegex = /[+-.]*\d*[.]\d+[,][+-.]*\d*[.]\d+/; if (!cordRegex.test(f.q.value)){ alert("the cordinate is in wrong form, please retry."); f.q.value=""; document.f.q.focus(); return false; } } </script> </body> </html> |
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