Keep form data after errors on basic Shopify contact form

Question 1

You can display the submitted data using the value attribute. For example:

<input type="text" id="contactFormEmail" name="contact[email]" value="{{form.email}}" />

Or for a textarea:

<textarea id="contactFormComments" name="contact[body]">{{form.body}}</textarea>

Question 2

I know this is an old posting, but I wanted to leave this here in case anyone (like me) needs it in the future. {{ form.email }} and {{ form.body }} are the only tags that will function this way - for the email and body fields. If you need to get data for other custom fields, you need to use a bit of a hack.

When the form returns with an error, the data from the submitted fields is available in the query string of the page. There is a great article from FreakDesign that shows how to pull that into your templates.

I wound up having to customize it some, though, for use with the Shopify contact form specifically. Here is what worked for me:

{% comment %}
    IF THE FORM THROWS ERRORS, POPULATE THE FORM FIELDS WITH DATA FROM THE QUERY STRING
    NOTE: To use the `{% if form.errors %}` statement below, you must place this code within the `{% form 'contact' %}` tag.
{% endcomment %}
{% if form.errors %}

    {%- comment -%}

        Liquid by Jason @ freakdesign.
        Questions? Ping me on twitter: @freakdesign

        Relates to blog post:
        http://freakdesign.com.au/blogs/news/get-the-url-querystring-values-with-liquid-in-shopify

        Example:
        https://jasons-experiments.myshopify.com/collections/all/products/3-4-sleeve-kimono-dress-coral-1?ref=freakdesign&cache=false

    {%- endcomment -%}

    {%- comment -%} Capture the content for header containing the tracking data {%- endcomment -%}
    {%- capture contentForQuerystring -%}{{ content_for_header }}{%- endcapture -%}

    {% comment %} Use string splitting to pull the value from content_for_header and apply some string clean up {% endcomment %}
    {%- assign pageUrl = contentForQuerystring | split:'"pageurl":"' | last | split:'"' | first | split:'.myshopify.com' | last |
        replace:'\/','/' |
        replace:'%20',' ' |
        replace:'\u0026','&' |
        replace:'%5B','[' |
        replace:'%5D',']' |
        replace:'+',' '
    -%}
    {% assign debug = false %}
    {%- for i in (1..1) -%}
        {%- comment -%} If the string doesn't contain a ? then we have no querystring. Go no further {%- endcomment -%}
        {%- unless pageUrl contains "?" -%}{% break %}{%- endunless -%}

        {%- comment -%} Split the url at the ? to get all values after it {%- endcomment -%}
        {%- assign pageQuerystring = pageUrl | split:'?' | last -%}

        {%- comment -%} Split the remaining string at & to get the list of keys and values (if any) {%- endcomment -%}
        {%- assign parts = pageQuerystring | split:'&' -%}

        {% assign formFirstName = '' %}
        {% assign formLastName = '' %}
        {% assign formPhone = '' %}
        {% assign formMethod = '' %}
        {% assign formReason = '' %}

        {%- comment -%} Loop over them... {%- endcomment -%}
        {%- for part in parts -%}

            {%- comment -%} Split the part at the =. Not all querystrings will be in pairs so we need to account for that {%- endcomment -%}
            {%- assign keyAndValue = part | split:'=' -%}

            {%- if keyAndValue.size > 1 -%}
                {%- if debug -%}
                    <!--
                    key: {{ keyAndValue[0] }}<br>
                    value: {{ keyAndValue[1] }}
                    -->
                {% endif %}

                {% case keyAndValue[0] %}

                    {% when 'contact[First Name]' %}
                    {% assign formFirstName = keyAndValue[1] %}

                    {% when 'contact[Last Name]' %}
                    {% assign formLastName = keyAndValue[1] %}

                    {% when 'contact[Phone Number]' %}
                    {% assign formPhone = keyAndValue[1] %}

                    {% when 'contact[Preferred Method Of Communication]' %}
                    {% assign formMethod = keyAndValue[1] %}

                    {% when 'contact[Reason For Inquiry]' %}
                    {% assign formReason = keyAndValue[1] %}

                {% endcase %}

            {%- else -%}
                {%- if debug -%}
                    <!--
                    value: {{ keyAndValue }}
                    -->
                {%- endif -%}
            {%- endif -%}

        {%- endfor -%}
    {%- endfor -%}

{% endif %}

Works like a charm. Hope that helps!