JavaScript Form Submit - Confirm or Cancel Submission Dialog Box

Question

For a simple form with an alert that asks if fields were filled out correctly, I need a function that does this:

• Shows an alert box when button is clicked with two options:

  • If "OK" is clicked, the form is submitted
  • If cancel is clicked, the alert box closes and the form can be adjusted and resubmitted

I think a JavaScript confirm would work but I can't seem to figure out how.

The code I have now is:

function show_alert() {
  alert("xxxxxx");
}

<form>
  <input type="image" src="xxx" border="0" name="submit" onclick="show_alert();" alt="PayPal - The safer, easier way to pay online!" value="Submit">
</form>

Answer 1

A simple inline JavaScript confirm would suffice:

<form onsubmit="return confirm('Do you really want to submit the form?');">

No need for an external function unless you are doing validation, which you can do something like this:

<script>
function validate(form) {

    // validation code here ...


    if(!valid) {
        alert('Please correct the errors in the form!');
        return false;
    }
    else {
        return confirm('Do you really want to submit the form?');
    }
}
</script>
<form onsubmit="return validate(this);">

Answer 2

The issue pointed in the comment is valid, so here is a different revision that's immune to that:

function show_alert() {
  if(!confirm("Do you really want to do this?")) {
    return false;
  }
  this.form.submit();
}

Answer 3

You could use the JS confirm function.

<form onSubmit="if(!confirm('Is the form filled out correctly?')){return false;}">
  <input type="submit" />
</form>

http://jsfiddle.net/jasongennaro/DBHEz/

Answer 4

Simple and easy :

<form onSubmit="return confirm('Do you want to submit?') ">
  <input type="submit" />
</form>

Answer 5

OK, just change your code to something like this:

<script>
function submit() {
   return confirm('Do you really want to submit the form?');
}
</script>

<form onsubmit="return submit(this);">
   <input type="image" src="xxx" border="0" name="submit" onclick="show_alert();"
      alt="PayPal - The safer, easier way to pay online!" value="Submit">
</form>

Also this is the code in run, just I make it easier to see how it works, just run the code below to see the result:

function submitForm() {
  return confirm('Do you really want to submit the form?');
}

<form onsubmit="return submitForm(this);">
  <input type="text" border="0" name="submit" />
  <button value="submit">submit</button>
</form>

Answer 6

If you want to apply some condition on form submit then you can use this method

<form onsubmit="return checkEmpData();" method="post" action="process.html">
  <input type="text" border="0" name="submit" />
  <button value="submit">submit</button>
</form>

One thing always keep in mind that method and action attribute write after onsubmit attributes

javascript code

function checkEmpData()
{
  var a = 0;

  if(a != 0)
  {
    return confirm("Do you want to generate attendance?");
  }
   else
   {
      alert('Please Select Employee First');
      return false;
   }  
}