Make Interest Groupings a required field

If you include an interest grouping in your sign-up form using checkboxes, you may want to enforce your visitors to select at least one interest.

There are multiple ways to go about this. As a start, you can pre-select one of the choices. To do this, you can add a "checked" attribute to the input field which you want to preselect.

In the following example, the input field for "Group 2" has an additional `checked` attribute. This will preselect that option when the page is loaded.

<p>
    <label>Checkbox Groups</label>
    <label>
        <input name="INTERESTS[c503c0f57d][]" type="checkbox" value="0f8a0ed3bd"> <span>Group 1</span>
    </label>
    <label>
        <input name="INTERESTS[c503c0f57d][]" type="checkbox" value="9446882237" checked> <span>Group 2</span>
    </label>
    <label>
        <input name="INTERESTS[c503c0f57d][]" type="checkbox" value="c12429b8e8"> <span>Group 3</span>
    </label>
</p>

Another option is to use the following piece of JavaScript in your sign-up form. Whenever the form is submitted, this piece of code will ensure that at least one interest grouping was selected.

<script>
jQuery('.mc4wp-form').on('submit', function(evt) {
	var checkboxFields = jQuery(this).find('[name^="INTERESTS"]');

	if( checkboxFields.length ) {
		
		// check if at least one field is required
		for(var i=0; i<checkboxFields.length; i++) {
			if( checkboxFields[i].checked ) {
				return true;
			}
		}
		
		alert("Please select at least 1 interest group.");
		evt.preventDefault();
		return false;
	}

	return true;
});
</script>

Of course you can also combine the above two methods. A full code example can be found in this code Gist.

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