I am using the following code to allow users to submit content to an online board:
$('form').submit(function(){
var form = $(this);
var name = form.find("input[name='name']").val();
var code = form.find("input[name='code']").val();
var content = form.find("input[name='content']").val();
if (name == '' || content == '')
return false;
$.post(form.attr('action'), {'name': name, 'code' : code, 'content': content}, function(data, status){
$('<li class="pending" />').text(content).prepend($('<small />').text(name)).appendTo('ul#messages');
$('ul#messages').scrollTop( $('ul#messages').get(0).scrollHeight );
form.find("input[name='content']").val('').focus();
});
return false;
});
Unfortunately, if a user rapidly presses enter or rapidly clicks the send button, the code will execute multiple times and their message will be sent multiple times.
How can I modify my code to prevent this multiple execution?
A simple client-side fix would be to create a local variable that tracks whether or not anything has been submitted and have the function only execute if false.
var submitted = false;
$('form').submit(function(){
var form = $(this);
var name = form.find("input[name='name']").val();
var code = form.find("input[name='code']").val();
var content = form.find("input[name='content']").val();
if (name == '' || content == '')
return false;
if (submitted)
return false;
submitted = true;
$.post(form.attr('action'), {'name': name, 'code' : code, 'content': content}, function(data, status){
$('<li class="pending" />').text(content).prepend($('<small />').text(name)).appendTo('ul#messages');
$('ul#messages').scrollTop( $('ul#messages').get(0).scrollHeight );
form.find("input[name='content']").val('').focus();
});
return false;
});
A better solution would be to send a unique token for the transaction to the client and have the client send it along with the request. You could have server-side coded to verify that the token has only been used once.
found this solution here
$("form").submit(function () {
if ($(this).valid()) {
$(this).submit(function () {
return false;
});
return true;
}
else {
return false;
}
});
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