Skip to content

Switching required input fields validate dynamically

I have a form with 2 buttons (Save Draft and Save Final FORM).
I would like to switch the required fields depending on which button pressed.
When I push the Save Draft it’s required to fill out only the Name’s field.
When I push the Save Final FORM it’s required to fill all of the fields except Text field.

How can I do that?

HTML:

<!doctype html>
<html lang="en">

<head>
    <!-- Required meta tags -->
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

    <!-- Bootstrap CSS -->
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@4.5.3/dist/css/bootstrap.min.css" integrity="sha384-TX8t27EcRE3e/ihU7zmQxVncDAy5uIKz4rEkgIXeMed4M0jlfIDPvg6uqKI2xXr2" crossorigin="anonymous">
    <title>FORM</title>
</head>
<body>

    <div class="container">
        <h2 class="text-center">Test From</h2>
        <br>
        <form action="upload.php" method="post">
        <h5>Types</h5>
            <div class="form-row">
                <div class="form-group col-md-12">
                    <div class="form-check">
                        <div class="custom-control custom-radio custom-control-inline">
                          <input type="radio" id="type_s" name="types" value="S" class="custom-control-input">
                          <label class="custom-control-label" for="type_s">Type (S)</label>
                        </div>
                        <div class="custom-control custom-radio custom-control-inline">
                          <input type="radio" id="type_z" name="types" value="Z" class="custom-control-input">
                          <label class="custom-control-label" for="type_z">Type (Z)</label>
                        </div>                      
                        <div class="custom-control custom-radio custom-control-inline">
                          <input type="radio" id="type_r" name="types" value="R" class="custom-control-input">
                          <label class="custom-control-label" for="type_r">Type (R)</label>
                        </div>
                        <div class="custom-control custom-radio custom-control-inline">
                          <input type="radio" id="type_t" name="types" value="T" class="custom-control-input">
                          <label class="custom-control-label" for="type_t">Type (T)</label>
                        </div>
                    </div>
                </div>               
            </div>
            <div class="form-row">
                <div class="form-group col-md-4">
                    <input type="number" class="form-control float-right" id="Number" name="Number"  oninput="javascript: if (this.value.length > this.maxLength) this.value = this.value.slice(0, this.maxLength);" maxlength="2" placeholder="Number" >
                    <small class="form-text text-muted">Number</small>
                </div>
                <div class="form-group col-md-4">
                    <input type="number" class="form-control float-right" id="Number2" name="Number2"  oninput="javascript: if (this.value.length > this.maxLength) this.value = this.value.slice(0, this.maxLength);" maxlength="5" placeholder="Number2" >
                    <small class="form-text text-muted">Number2</small>
                </div>
                <div class="form-group col-md-4">
                    <input type="text" class="form-control float-right" id="Text" name="Text" placeholder="Text" maxlength="15" >
                    <small class="form-text text-muted">Text</small>
                </div>
            </div>
        <h5>Name</h5>
            <div class="form-row">
                <div class="form-group col-md-6">
                    <input type="text" class="form-control" id="Name" name="Name" placeholder="Name" required >
                    <small class="form-text text-muted">Name</small>
                </div>
            </div>
            <h6>Select:</h6>
            <div class="form-row">
                <div class="form-group col-md-4">
                    <select class="custom-select" id="select" name="select" >
                        <option value="" disabled selected>Choose</option>
                        <option value="select_1">Select 1</option>
                        <option value="select_1">Select 2</option>
                        <option value="select_1">Select 3</option>
                        <option value="select_1">Select 4</option>
                    </select>
                    <small class="form-text text-muted">Please Select</small>    
                </div>
            </div>
            <br>
            <div class="no-print text-center">
                <input class="btn btn-primary" type="submit" name="form_draft" value="Save Draft">    
                <input class="btn btn-primary" type="submit" name="form_new" value="Save Final FORM">
            </div>            
    </form>
</div>

    <!-- Optional JavaScript; choose one of the two! -->
    <!-- Option 1: jQuery and Bootstrap Bundle (includes Popper) -->
    <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery.mask/1.14.16/jquery.mask.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@4.5.3/dist/js/bootstrap.bundle.min.js" integrity="sha384-ho+j7jyWK8fNQe+A12Hb8AhRq26LrZ/JpcUGGOn+Y7RsweNrtN/tE3MoK7ZeZDyx" crossorigin="anonymous"></script>
</body>
</html>

Thanks 😉

JSFIDDLE

Answer

Just add a click eventlistener to your buttons.

Add this at the END of your file before closing </body> tag. I’ve only given you an example of the first button. You should be able to reproduce this however you want for the other button.

<script>
    var btnformdraft = document.getElementsByName("form_draft")[0];
    btnformdraft.addEventListener("click", function(evt) {
        //set default doContinue
        let doContinue = true;

        //verify your fields here
        if(document.getElementById("Name").value === "") {
            doContinue = false;
        }
        
        //add other field verifications

        //verify if we continue 
        if(!doContinue) {
            evt.preventDefault();
          //showing alert BUT THIS CAN BE CHANGED TO HOWEVER YOU WANT TO DISPLAY THE ERROR MESSAGE
          alert('The NAME field is required');
        }
    }, false);
</script>