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how to alert Error Messagen in Marketing form

i have a Marketing form and i need to change the display error message see Picture. my form : enter image description here

and I want That my error message be like This: enter image description here


   here is my Code :

        <div>
                <div>
                    <meta type="xrm/designer/setting" name="layout-editable" value="marketing-designer-layout-editable">
                        <meta type="xrm/designer/setting" name="layout-max-width" value="600px" datatype="text" label="Layout max width">
                            <form data-container="true" style="null" action = "" method = "get" novalidate>
                                    <style>
                                        div[data-editorblocktype=Field-radioButtons] 
                                        {
                                            width: 25% ;
                                            text-align: left ;
                                        }

                                        div[data-editorblocktype=Field-radioButtons] input 
                                        {
                                            width: auto;
                                            height: auto;
                                            margin-bottom: 3px;
                                            float: right;
                                        }

                                        div[data-editorblocktype=Field-radioButtons] span.lp-radioButton 
                                        {
                                            /* This rule is needed to style all radio button fields. For product constraints each option is defined as input and label wrapped into a span*/
                                            display: block;
                                            margin: 2px;
                                        }

                                        [data-layout="true"]
                                        {
                                                margin: 0 auto;
                                                max-width: /* @layout-max-width */
                                                600px /* @layout-max-width */
                                                ;
                                        }
                                    </style>

                                        <div data-layout="true" tabindex="0">
                                                <div data-section="true" class="emptyContainer">
                                                    <div style=" display: flex;width: 100%;flex-wrap: wrap;">
                                                        <div style="clear:both;"></div>
                                                        <div data-container="true" class="columnContainer" data-container-width="100" style="display: block; min-height: 70px; min-width: 20px; width: calc(100% - 0px); padding: 10px; float: left; word-wrap: break-word; word-break: break-word; flex-direction: column;">
                                                            <div data-editorblocktype="Image">
                                                                <div class="imageWrapper" width="100%" align="Center">  
                                                                    <img alt="Test Newsletter" class="" src="https://test/Y0gdmVq8p6izVL5Ig6QF2elBYT71iDv3rsgqHc-uOI8!" style="max-height: 100%; max-width: 100%; position: static; display: block; top: 0px; left: 0px; box-sizing: border-box;">
                                                                </div>
                                                            </div>
                                                            <div data-editorblocktype="Text"><p><big><big><span><strong>Abonnieren Sie unseren </strong></span></big></big><br>
                                                                <span><big><big><strong>Test Newsletter!</strong></big></big></span></p>
                                                                <p><span style="font-size:16px;">Nach der Übermittlung Ihrer Kontaktdaten erhalten Sie von <em>[email protected]</em> einen Bestätigungslink, um die Anmeldung abzuschließen.</span></p>
                                                            </div>

                                                            <div data-editorblocktype="Text"><p>* Pflichtfelder</p> </div>

                                                            <div data-editorblocktype="Field-text" style="text-align: center;">
                                                                <div class="marketing-field" style="text-align: center;">
                                                                    <div class="lp-form-field" data-required-field="false" style="text-align: left;"><label class="lp-ellipsis" for="3f746946-34b4-442c-a677-e232cdd2bc40" title="">Vorname</label>
                                                                        <input class="lp-form-fieldInput form-control form-text lp-form-fieldInput" data-requirederrormessage="Pflichtfeld! Bei Bedarf  ein Pseudonym verwenden" id="3f746946-34b4-442c-a677-e232cdd2bc40" name="3f746946-34b4-442c-a677-e232cdd2bc40" placeholder="Vorname" style="width:100%" title="" type="text" value="Vorname" autocomplete="given-name">
                                                                    </div>
                                                                </div>
                                                            </div>
                                                            <div data-editorblocktype="Field-text">
                                                                <div class="marketing-field">
                                                                    <div class="lp-form-field" data-required-field="false"><label class="lp-ellipsis" for="e1dfc514-f301-4cb2-855a-4c8fa8331207" title="">Nachname</label>
                                                                        <input class="lp-form-fieldInput form-control form-text lp-form-fieldInput" data-requirederrormessage="Pflichtfeld! Bei Bedarf ein Pseudonym verwenden." id="e1dfc514-f301-4cb2-855a-4c8fa8331207" name="e1dfc514-f301-4cb2-855a-4c8fa8331207" placeholder="Nachname" style="width:100%" title="" type="text" value="Nachname " autocomplete="family-name">
                                                                    </div>
                                                                </div>
                                                            </div>
                                                            <div data-editorblocktype="Field-email">
                                                                <div class="marketing-field">
                                                                    <div class="lp-form-field" data-required-field="true"><label class="lp-ellipsis" for="7f685ebb-7c54-4cff-a1bc-772562d25c38" title="">E-Mail-Adresse</label><span class="lp-required">*</span>
                                                                        <input class="lp-form-fieldInput form-control form-text lp-form-fieldInput" id="7f685ebb-7c54-4cff-a1bc-772562d25c38" name="7f685ebb-7c54-4cff-a1bc-772562d25c38" placeholder="E-Mail-Adresse" required="required" style="width:100%" title="" type="email" autocomplete="email">
                                                                    </div>
                                                                </div>
                                                            </div>
                                                        </div>
                                                                        
                                                        <div style="clear:both;"></div>
                                                    </div>
                                                </div>
                                            <div data-section="true" class="">
                                                <div style="
                                                    display: flex;
                                                    width: 100%;
                                                    ;flex-wrap: wrap;">
                                                    
                                                    <div style="clear:both;"></div>
                                                        <div data-container="true" class="columnContainer" data-container-width="100" style="display: block; min-height: 70px; min-width: 20px; width: calc(100% - 0px); padding: 10px; float: left; word-wrap: break-word; word-break: break-word; flex-direction: column;">
                                                            <div data-editorblocktype="Field-dropdown" style="display: none;">
                                                                <div class="marketing-field">
                                                                    <div class="lp-form-field" data-required-field="true"><label class="lp-ellipsis" for="f7796368-6e5b-e911-a96e-000d3ab496ce" title="">Datenquelle</label><span class="lp-required">*</span>
                                                                        
                                                                        <select class="lp-form-fieldInput" id="f7796368-6e5b-e911-a96e-000d3ab496ce" name="f7796368-6e5b-e911-a96e-000d3ab496ce" required="required" title="">
                                                                            <option value="120000002">E-Mail (nachverfolgen)</option>
                                                                            <option value="120000001">Aktion</option>
                                                                            <option selected="selected" value="120000003">Newsletter / Mailing</option>
                                                                            <option value="181510000">Projekt-Workshop</option>
                                                                            <option value="181510001">Registrierung auf Webportal</option>
                                                                            <option value="120000000">Veranstaltung</option>
                                                                            <option value="100000000">Visitenkarte erhalten </option>
                                                                        </select>
                                                                    </div>
                                                                </div>
                                                            </div>
                                                            <div data-editorblocktype="SubscriptionListBlock">
                                                                <div class="marketing-subscription-list"><input class="lp-form-fieldInput" id="e6648b6d-0894-e911-a971-000d3ab496c3" name="e6648b6d-0894-e911-a971-000d3ab496c3" required="required" type="checkbox"> <label for="e6648b6d-0894-e911-a971-000d3ab496c3">Ich habe die <a href="https://www.test.de/datenschutz">Datenschutzerklärung</a> gelesen und akzeptiert.<span class="lp-required">*</span></label><br>
                                                                     
                                                                </div>
                                                            </div>
                                                            <div class="btn." data-editorblocktype="SubmitButtonBlock">
                                                                <p align="“center“"><button class=".btn .btn-primary lp-form-button lp-form-fieldInput" name="submit" type="submit">Anmeldung absenden</button></p>
                                                            </div>
                                                        </div>
                                                        <div style="clear:both;"></div>
                                                </div>
                                            </div>
                                        </div>
                            </form>
                </div>
            </div>

Answer

As it has already been mentioned in the comments, you should use JavaScript to validate the form. Here is a runnable code snippet:

function formValidate() {
  var fname = document.getElementById("fname").value;
  var lname = document.getElementById("lname").value;
  var email = document.getElementById("email").value;
  var tc = document.getElementById("tc");
  if (fname.length === 0) {
    document.getElementById("errfname").style.display = "block";
    document.getElementById("errorbox").style.display = "block";
  } else {
    document.getElementById("errfname").style.display = "none";
  }
  if (lname.length === 0) {
    document.getElementById("errlname").style.display = "block";
    document.getElementById("errorbox").style.display = "block";
  } else {
    document.getElementById("errlname").style.display = "none";
  }
  if (email.length === 0) {
    document.getElementById("erremail").style.display = "block";
    document.getElementById("errorbox").style.display = "block";
  } else {
    document.getElementById("erremail").style.display = "none";
  }
  if (tc.checked === false) {
    document.getElementById("errtandc").style.display = "block";
    document.getElementById("errorbox").style.display = "block";
  } else {
    document.getElementById("errtandc").style.display = "none";
  }
  if (fname.length !== 0 && lname.length !== 0 && email.length !== 0 && tc.checked === true) {
    window.location.href = "https://stackoverflow.com";
  }
}
body {
  background-color: lightblue;
}

input[type=text],
input[type=email] {
  width: 80%;
  font-size: 20px;
  float: right;
}

.errorbox {
  background-color: red;
  color: white;
  width: 98%;
  position: relative;
  padding: 1%;
  display: none;
}
<!DOCTYPE html>
<html>

<head>
  <title>Example form</title>
</head>

<body>
  <div class="errorbox" id="errorbox">
    <p id="errfname" style="display: none;">Please enter your first name!</p>
    <p id="errlname" style="display: none;">Please enter your last name!</p>
    <p id="erremail" style="display: none;">Please enter your Email address!</p>
    <p id="errtandc" style="display: none;">Please check the terms and conditions check box!</p>
  </div>
  <h1>Test newsletter!</h1>
  <p>This is a test newsletter</p>
  <p><span style="color: red;">* </span> Required fields</p><br>
  <span style="color: red;">*</span>First name:
  <input type="text" placeholder="First name" id="fname"><br><br>
  <span style="color: red;">*</span>Last name:
  <input type="text" placeholder="Last name" id="lname"><br><br>
  <span style="color: red;">*</span>Email-address:
  <input type="email" placeholder="Email address" id="email"><br><br><br>

  <input type="checkbox" name="checkbox" id="tc">I agree to the <a href="#">Terms and Conditions</a> of this website.<br>
  <button onclick="formValidate()">Submit</button>

</body>

</html>