Ask How Customers Heard About Your Store On The Cart Page - 2022 Shopify Tutorial

<style>
#how-did-you-hear-about-us--label,
#how-did-you-hear-about-us-other--label {
    font-weight: bold;
}

select#how-did-you-hear-about-us,
input#how-did-you-hear-about-us-other {
    width: 100%;
    padding: 8px 10px 8px 10px;   
    line-height: 1.2;
}

#how-did-you-hear-about-us,
#how-did-you-hear-about-us-other,
#how-did-you-hear-about-us--label,
#how-did-you-hear-about-us--error,
#how-did-you-hear-about-us-other--label,
#how-did-you-hear-about-us-other--error {
    display:block;
    margin-bottom: 5px;
} 

#how-did-you-hear-about-us-other.error,
#how-did-you-hear-about-us.error {
    border: 2px solid {{ settings.hau_error_color }};
}

#how-did-you-hear-about-us--error,
#how-did-you-hear-about-us-other--error {
    color: {{ settings.hau_error_color }};
}
</style>

<div class="form-vertical">
<p>   
    <label id="how-did-you-hear-about-us--label" for="how-did-you-hear-about-us">How did you hear about us?</label>
    <span id="how-did-you-hear-about-us--error" style="display:none">{{ settings.hau_error_message }}</span>
    <select id="how-did-you-hear-about-us" name="attributes[how-did-you-hear-about-us]">
    <option value=""{% if cart.attributes.how-did-you-hear-about-us == "" %} selected{% endif %}>Please make a selection</option>
    {% assign optionsArray = settings.hau_form_options | split: ',' %}
    {% for o in optionsArray %}
    {% assign option = o | strip %}
    <option value="{{ option }}"{% if cart.attributes.how-did-you-hear-about-us == option %} selected{% endif %}>{{ option }}</option>
    {% endfor %}
    <option value="Other"{% if cart.attributes.how-did-you-hear-about-us == "Other" %} selected{% endif %}>Other</option>
    </select>
</p>
<p id="otherFormWrapper" style="{% unless cart.attributes.how-did-you-hear-about-us == 'Other' %}display:none{% endunless %}">  
    <label id="how-did-you-hear-about-us-other--label" for="how-did-you-hear-about-us-other">Other</label>
    <span id="how-did-you-hear-about-us-other--error" style="display:none">{{ settings.hau_error_message_other }}</span>
    <input id="how-did-you-hear-about-us-other" type="text" name="attributes[how-did-you-hear-about-us-other]" value="{{ cart.attributes.how-did-you-hear-about-us-other }}"/>
</p>
</div>

<script>
(function() {  

    document.addEventListener("DOMContentLoaded", initForm);
    document.addEventListener("shopify:section:load", initForm);

    function initForm(){

    var formElement = document.querySelector('#how-did-you-hear-about-us');
    var formError = document.querySelector('#how-did-you-hear-about-us--error');
    var otherFormElement = document.querySelector('#how-did-you-hear-about-us-other');
    var otherFormError = document.querySelector('#how-did-you-hear-about-us-other--error');
    var otherFormWrapper = document.querySelector('#otherFormWrapper');
    var checkoutButtons = document.querySelectorAll('[name="checkout"], [name="goto_pp"], [name="goto_gc"]');

    function showOrHideForm(){
        if (formElement.value == 'Other'){          
        otherFormWrapper.style.display = '';
        } else {
        otherFormWrapper.style.display = 'none';
        }   
    }

    function checkFormElement(){
        if (formElement.value.length == 0){    
        formElement.classList.add('error');
        formError.style.display = '';
        } else {
        if (formElement.classList.contains('error')){
            formElement.classList.remove('error');
            formError.style.display = 'none';
        }
        }
    }

    function checkOtherFormElement(){
        if (otherFormElement.value.length == 0){
        otherFormElement.classList.add('error');
        otherFormError.style.display = '';   
        } else {
        if (otherFormElement.classList.contains('error')){
            otherFormElement.classList.remove('error');
            otherFormError.style.display = 'none';
        }
        }
    }

    otherFormElement.addEventListener("input", function() {
        {% if settings.hau_form_validation %}
        checkOtherFormElement();
        {% endif %}
    });

    formElement.addEventListener("change", function() {  
        showOrHideForm();
        {% if settings.hau_form_validation %}
        checkFormElement();          
        {% endif %}
    });

    checkoutButtons.forEach(function(element){
        element.addEventListener("click", function(evt) {

        {% if settings.hau_form_validation %}
        var validated = true;         
        if (formElement.value.length == 0){    
            checkFormElement(); 
            validated = false;
        }         
        if (formElement.value == 'Other'){           
            if (otherFormElement.value.length == 0){ 
            checkOtherFormElement();
            validated = false;
            }
        }
        if (!validated) {
            evt.preventDefault();
            evt.stopPropagation();           
        }
        {% endif %}
        });
    });  

    }   
})() 
</script>

   {% render 'hear-about-us' %}

{
"name": "Hear About Us",
"settings": [
    {
        "type": "text",
        "id": "hau_form_options",
        "label": "Form options",
        "default": "Facebook, Twitter, Google, Instagram, Youtube",
        "info": "Separate each option with a comma"
    },
    {
        "type": "header",
        "content": "Form validation"
    },
    {
        "type": "checkbox",
        "id": "hau_form_validation",
        "label": "Enable form validation",
        "default": true
    },
    {
        "type": "text",
        "id": "hau_error_message",
        "label": "Error message",
        "info": "The error message that is displayed when no selection is made",
        "default": "Please select an option below"
    },
    {
        "type": "text",
        "id": "hau_error_message_other",
        "label": "Other field error message",
        "info": "The error message that is displayed when there is no input in the 'Other' field",
        "default": "Please fill the text field below"
    },
    {
        "type": "header",
        "content": "Error styling"
    },
    {
        "type": "color",
        "id": "hau_error_color",
        "label": "Color",
        "default": "#ff0000"
    }
]
},

{% unless settings.hau_form_validation %}novalidate{% endunless %}