JavaScriptによるフォームの重複提出を防止する例

 
 
 
 
 
 

 
var inprocess = false; 
window.onload = function(){ 

document.forms["picker"].onsubmit = validateSubmit; 
document.getElementById("refresh").onclick = startOver; 
} 
function validateSubmit () { 
//           
if (inprocess) return; 
inprocess = true; 
console.log(inprocess); 
document.getElementById("submitbutton").disabled = true; 

document.getElementById("refresh").style.display = "block"; 
document.getElementById("message").innerHTML = "<p>  processing，  </p>"; 
return false; 
} 
function startOver(){ 
inprocess = false; 
document.getElementById("submitbutton").disabled = false; 
document.getElementById("message").innerHTML = ""; 
document.getElementById("refresh").style.display = "none"; 

}