javascript - Ajax submit using a button -


i using code page: http://www.w3schools.com/ajax/ajax_database.asp build ajax solution.

i getting there, code use onchange, use button submit, instead.

one of tries:

<!doctype html> <html> <head> <script> function showcustomer(str) { var xmlhttp;     if (str=="")   {   document.getelementbyid("txthint").innerhtml="";   return;   } if (window.xmlhttprequest)   {// code ie7+, firefox, chrome, opera, safari   xmlhttp=new xmlhttprequest();   } else   {// code ie6, ie5   xmlhttp=new activexobject("microsoft.xmlhttp");   } xmlhttp.onreadystatechange=function()   {   if (xmlhttp.readystate==4 && xmlhttp.status==200)     {     document.getelementbyid("txthint").innerhtml=xmlhttp.responsetext;     }   } xmlhttp.open("get","getcustomer.asp?q="+str,true); xmlhttp.send(); } </script> </head> <body>  <form action="">  <select name="customers"> <option value="">select customer:</option> <option value="alfki">alfreds futterkiste</option> <option value="norts ">north/south</option> <option value="wolza">wolski zajazd</option> </select> <input name="submit1" type="submit" onclick="showcustomer(this.value)" /> </form> <br> <div id="txthint">customer info listed here...</div>  </body> </html>

onchange event on select element.

just tie event button element.

<button onclick="showcustomer()">submit</button>

and desired customer in showcustomer() method

function showcustomer() {     var str = document.getelementbyid("customers").value;     .     .     .     xmlhttp.open("get","getcustomer.asp?q="+str,true);     xmlhttp.send(); }

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