snackbar validation MDL - Javascript/Jquery

Question

I want to show snackbar if input field is empty. maybe replace default html5 required validation with Snackbar/Toast. Here my code:

<body>

<!-- The drawer is always open in large screens. The header is always shown, even in small screens. -->
<div class="mdl-layout mdl-js-layout mdl-layout--fixed-header">
  <header class="mdl-layout__header">
    <button class="mdl-layout__drawer-button" onclick="window.location.href='index.html';">
      <i class="material-icons">arrow_back</i>
    </button>
    <div class="mdl-layout__header-row">
      <span class="mdl-layout-title">Cek e-KTP</span>
      <div class="mdl-layout-spacer"></div>
    </div>
  </header>
  <main class="mdl-layout__content">
    <div class="page-content">
    <!-- Your content goes here -->
        <form id="dx_form" name="dx_form" class="dx_form" action="#" method="post">
            <div class="mdl-textfield mdl-js-textfield mdl-textfield--floating-label">
                <input class="mdl-textfield__input" type="text" id="no_mohon" name="no_mohon" style="text-transform:uppercase">
                <label class="mdl-textfield__label" for="no_mohon">Masukan Nomor Permohonan e-KTP</label>
            </div>
                <div class="mdl-layout-spacer"></div>
                <button class="mdl-button mdl-js-button mdl-button--raised mdl-js-ripple-effect mdl-button--accent">Cek</button>
                <div class="mdl-layout-spacer"></div>
        </form>
    <!-- Your content goes here -->
    </div>
  </main>
    <footer class="dx_footer">
        <div class="mdl-grid">
          <div class="mdl-cell mdl-cell--1-col">
            <button class="mdl-button mdl-js-button mdl-button--icon" onclick="window.location.href='ktp.html';">
              <i class="material-icons">credit_card</i>
            </button>
            <div class="mdl-layout-spacer"></div>
            e-KTP
          </div>
          <div class="mdl-cell mdl-cell--1-col">
            <button class="mdl-button mdl-js-button mdl-button--icon" onclick="window.location.href='kk.html';">
              <i class="material-icons">chrome_reader_mode</i>
            </button>
            <div class="mdl-layout-spacer"></div>
            KK
          </div>
          <div class="mdl-cell mdl-cell--1-col">
            <button class="mdl-button mdl-js-button mdl-button--icon" onclick="window.location.href='info.html';">
              <i class="material-icons">info_outline</i>
            </button>
            <div class="mdl-layout-spacer"></div>
            Info
          </div>
          <div class="mdl-cell mdl-cell--1-col">
            <button class="mdl-button mdl-js-button mdl-button--icon" onclick="window.location.href='devs.html';">
              <i class="material-icons">developer_board</i>
            </button>
            <div class="mdl-layout-spacer"></div>
            Devs.
          </div>
        </div>
    </footer>
</div>
</body>

How to display mdl snackbar validation if inputfield is empty? any help would be appreciated. thx.

Grey · Accepted Answer · 2016-12-13 07:29:47Z

2

//your button
<button onclick="validate()"></button>

function validate() {
    if(document.getElementById('no_mohon').value == "" || document.getElementById('no_mohon').value == null || document.getElementById('no_mohon').value == undefined) {
        //get the snackbar
        var notification = document.querySelector('.mdl-js-snackbar');
        //creating data for snackbar notification
        var data = {
            message: 'Please make sure you filled in all the required fields.',
            timeout: 3000
        }
        //pushing the notification to the screen
        notification.MaterialSnackbar.showSnackbar(data);
    } else {
        //do form post action here
    }
}

[edit] added .value property to if statement.

[edit] added a way to reuse code for more fields

//your button
<button onclick="validate(this.id, 'message string here')"></button>

function validate(id, msg) {
    if(document.getElementById(id).value == "" || document.getElementById(id).value == null || document.getElementById(id).value == undefined) {
        //get the snackbar
        var notification = document.querySelector('.mdl-js-snackbar');
        //creating data for snackbar notification
        var data = {
            message: msg,
            timeout: 3000
        }
        //pushing the notification to the screen
        notification.MaterialSnackbar.showSnackbar(data);
    } else {
        //do form post action here
    }
}

edited Dec 13, 2016 at 7:29

answered Nov 21, 2016 at 11:43

Grey

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21 Comments

omdx Over a year ago

thx for the answer. but, input textfield is not required. so if i click the button, its still post the form. is there any code if i click the button, snackbar just like default html validation to prevent from post?

Grey Over a year ago

delete the form tags, look at my answer for the edited code

Grey Over a year ago

oops, I swapped the statements on accident, making that, when the textfield is empty, it would be pushing the form, should be fixed now

omdx Over a year ago

I delete action="#" & method from dx_form, new code still post without being validated. I add form post code //do form post action here document.getElementById("dx_form").action = "devs.html";

Grey Over a year ago

did you delete the form tag? as having this in your code will do the same as action="#"

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