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An example of JavaScript to prevent repeated form submissions

Source: Internet
Author: User
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An example of JavaScript to prevent repeated form submissions

<! DOCTYPE html>

<meta http-equiv= "Content-Type" content= "text/html; charset=UTF-8" /> 

<Title> prevent repeated forms from being submitted </title>

<style> 

#refresh{ 

display: none; 

width:200px; 

height:20px; 

background-color: #ff0; 

  

} 

  

</style> 

  

<script> 

var inprocess = false ; 

window.onload = function (){ 

  

document.forms[ "picker" ].onsubmit = validateSubmit; 

document.getElementById( "refresh" ).onclick = startOver; 

} 

function validateSubmit () { 

// Prevent repeated forms from being submitted

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. Please wait. </p>" ; 

return false ; 

} 

function startOver(){ 

inprocess = false ; 

document.getElementById( "submitbutton" ).disabled = false ; 

document.getElementById( "message" ).innerHTML = "" ; 

document.getElementById( "refresh" ).style.display = "none" ; 

  

} 

</script> 

  

<body> 

  

<form id= "picker" method= "post" action= "" > 

group1:<input type= "radio" name= "group1" value= "one" /> 

group2:<input type= "radio" name= "group1" value= "two" /> 

group3:<input type= "radio" name= "group1" value= "three" /><br /><br /> 

Input 1: <input type= "text" id= "intext" /> 

Input 2: <input type= "text" id= "intext2" /> 

Input 3: <input type= "text" id= "intext3" /> 

<input type= "submit" id= "submitbutton" value= "send form" /> 

</form> 

<div id= "refresh" > 

<P> click me </p>

</div> 

<div id= "message" ></div> 

</body> 

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