How to add Google Custom Search in Genesis. https://sridharkatakam.com/add-google-custom-search-genesis/

functions.php

add_filter( 'genesis_search_text', 'custom_search_text' );
/**
 * Customizes the text of the search input
 *
 * @param  string $text current text
 * @return string modified text
 */
function custom_search_text( $text ) {
	return esc_attr( 'Google Search...' );
}

add_filter( 'genesis_search_form', 'custom_search_form', 10, 4 );
function custom_search_form( $form, $search_text, $button_text, $label ) {
	$search_text = get_search_query() ? apply_filters( 'the_search_query', get_search_query() ) : apply_filters( 'genesis_search_text', __( 'Search this website', 'genesis' ) . ' …' );

	$button_text = apply_filters( 'genesis_search_button_text', esc_attr__( 'Search', 'genesis' ) );

	$onfocus = "if ('" . esc_js( $search_text ) . "' === this.value) {this.value = '';}";
	$onblur  = "if ('' === this.value) {this.value = '" . esc_js( $search_text ) . "';}";

	//* Empty label, by default. Filterable.
	$label = apply_filters( 'genesis_search_form_label', '' );

	$value_or_placeholder = ( get_search_query() == '' ) ? 'placeholder' : 'value';

	if ( genesis_html5() ) {

		$form  = sprintf( '<form %s>', genesis_attr( 'search-form' ) );

		if ( genesis_a11y( 'search-form' ) ) {

			if ( '' == $label )  {
				$label = apply_filters( 'genesis_search_text', __( 'Search this website', 'genesis' ) );
			}

			$form_id = uniqid( 'searchform-' );

			$form .= sprintf(
				'<meta itemprop="target" content="%s"/><label class="search-form-label screen-reader-text" for="%s">%s</label><input itemprop="query-input" type="search" name="q" id="%s" %s="%s" /><input type="submit" value="%s" /></form>',
				home_url( '/?s={s}' ),
				esc_attr( $form_id ),
				esc_html( $label ),
				esc_attr( $form_id ),
				$value_or_placeholder,
				esc_attr( $search_text ),
				esc_attr( $button_text )
			);

		} else {

			$form .= sprintf(
				'%s<meta itemprop="target" content="%s"/><input itemprop="query-input" type="search" name="q" %s="%s" /><input type="submit" value="%s"  /></form>',
				esc_html( $label ),
				home_url( '/?s={s}' ),
				$value_or_placeholder,
				esc_attr( $search_text ),
				esc_attr( $button_text )
			);
		}


	} else {

		$form = sprintf(
			'<form method="get" class="searchform search-form" action="%s" role="search" >%s<input type="text" value="%s" name="q" class="s search-input" onfocus="%s" onblur="%s" /><input type="submit" class="searchsubmit search-submit" value="%s" /></form>',
			// home_url( '/' ),
			home_url( '/search/' ),
			esc_html( $label ),
			esc_attr( $search_text ),
			esc_attr( $onfocus ),
			esc_attr( $onblur ),
			esc_attr( $button_text )
		);

	}

	return $form;
}

add_filter( 'genesis_attr_search-form', 'custom_attributes_search_form' );
/**
 * Add attributes for search form.
 *
 * @since 2.2.0
 *
 * @param array $attributes Existing attributes.
 *
 * @return array Amended attributes.
 */
function custom_attributes_search_form( $attributes ) {

	$attributes['action'] = home_url( '/search/' );

	return $attributes;

}

style.css

.entry-content .search-form {
	width: 100%;
	max-width: 800px;
}

.search-form input {
	float: left;
	font-size: 16px;
}

.content .search-form input[type="search"] {
	width: 80%;
	margin-right: 2%;
}

.search-form input[type="submit"] {
	width: 18%;
	margin-top: 0;
}

#cse .gsc-control-cse {
	padding: 0;
	border: none;
}

#cse .gsc-above-wrapper-area {
	border-bottom: none;
	padding: 0;
}

#cse table {
	line-height: 1;
	margin-bottom: 0;
}

#cse tbody {
	border-bottom: none;
}

#cse .gsc-selected-option-container {
	max-width: none;
}

#cse .gsc-result .gs-title {
	height: auto;
}

@media only screen and (max-width: 661px) {

	.search-form input {
		float: none;
	}

	.search-form input[type="search"] {
		width: 100%;
		margin-right: 0;
		margin-bottom: 10px;
	}

	.search-form input[type="submit"] {
		width: auto;
	}

}

template_google-cse.php

<?php
/*
	Template Name: Google Custom Search
	Description: Google Custom Search
 	Created by John Levandowski
 	Modified by: Rowell Dionicio and Sridhar Katakam
	Site: https://rowell.dionicio.net/adding-google-custom-search-to-genesis-framework/, https://sridharkatakam.com/add-google-custom-search-genesis/
*/

# Force full width content
add_filter( 'genesis_pre_get_option_site_layout', '__genesis_return_full_width_content' );

# Remove the breadcrumb
// remove_action( 'genesis_before_loop', 'genesis_do_breadcrumbs' );

# Remove the post content
remove_action( 'genesis_entry_content', 'genesis_do_post_content' );

# Add custom post content
add_action( 'genesis_entry_content', 'custom_do_post_content' );

/**
 * Outputs custom post content
 *
 * @return void
 */
function custom_do_post_content() {
	get_search_form(); ?>

	INSERT GOOGLE CUSTOM SEARCH CODE HERE

<?php }

genesis();

template_google-cse1.php

<?php
/*
	Template Name: Google Custom Search
	Description: Google Custom Search
 	Created by John Levandowski
 	Modified by: Rowell Dionicio and Sridhar Katakam
	Site: https://rowell.dionicio.net/adding-google-custom-search-to-genesis-framework/, https://sridharkatakam.com/add-google-custom-search-genesis/
*/

# Force full width content
add_filter( 'genesis_pre_get_option_site_layout', '__genesis_return_full_width_content' );

# Remove the breadcrumb
// remove_action( 'genesis_before_loop', 'genesis_do_breadcrumbs' );

# Remove the post content
remove_action( 'genesis_entry_content', 'genesis_do_post_content' );

# Add custom post content
add_action( 'genesis_entry_content', 'custom_do_post_content' );

/**
 * Outputs custom post content
 *
 * @return void
 */
function custom_do_post_content() {
	get_search_form(); ?>

	<div id='cse' style='width: 100%;'>Loading</div>
	<script src='//www.google.com/jsapi' type='text/javascript'></script>
	<script type='text/javascript'>
	google.load('search', '1', {language: 'en', style: google.loader.themes.V2_DEFAULT});
	google.setOnLoadCallback(function() {
	  var customSearchOptions = {};
	  var orderByOptions = {};
	  orderByOptions['keys'] = [{label: 'Relevance', key: ''} , {label: 'Date', key: 'date'}];
	  customSearchOptions['enableOrderBy'] = true;
	  customSearchOptions['orderByOptions'] = orderByOptions;
	  var customSearchControl =   new google.search.CustomSearchControl('003698980430458114438:pxccgvs_fv0', customSearchOptions);
	  customSearchControl.setResultSetSize(google.search.Search.FILTERED_CSE_RESULTSET);
	  var options = new google.search.DrawOptions();
	  options.enableSearchResultsOnly();
	  options.setAutoComplete(true);
	  customSearchControl.draw('cse', options);
	  function parseParamsFromUrl() {
	    var params = {};
	    var parts = window.location.search.substr(1).split('&');
	    for (var i = 0; i < parts.length; i++) {
	      var keyValuePair = parts[i].split('=');
	      var key = decodeURIComponent(keyValuePair[0]);
	      params[key] = keyValuePair[1] ?
	          decodeURIComponent(keyValuePair[1].replace(/\+/g, ' ')) :
	          keyValuePair[1];
	    }
	    return params;
	  }
	  var urlParams = parseParamsFromUrl();
	  var queryParamName = 'q';
	  if (urlParams[queryParamName]) {
	    customSearchControl.execute(urlParams[queryParamName]);
	  }
	}, true);
	</script>

<?php }

genesis();