Trouble adding JavaScript in visual editor (Sharpspring embed code)

You need the unfiltered_html capability to write JavaScript in post content. This is granted by default to administrators and editors.

The better way would be to write a small plugin that provides you a shortcode:

<?php

/**
 * Plugin Name: WPSE 234978 – Provide shortcode for Sharpspring embed
 * Plugin URL:  http://wordpress.stackexchange.com/q/234978/31323
 * License:     MIT
 * Version:     1.0.0
 * Author:      David Naber
 */

namespace WPSE234978;

add_action(
    'wp_loaded',
    function () {
        /**
         * Register the shortcode '[sharpspring_embed]'
         */
        add_shortcode( 'sharpsrpring_embed', __NAMESPACE__ . '\sharpspring_embed_shortcode' );
    }
);

/**
 * Translates the shortcode to the sharpspring embed code
 *
 * @return string
 */
function sharpspring_embed_shortcode() {

    $embed = <<<HTML
<script type="text/javascript">
    var ss_form = {'account': '**********', 'formID':'****************'};
    ss_form.width="100%";
    ss_form.height="1000";
    ss_form.domain = '***********';
    // ss_form.hidden = {'Company': 'Anon'}; // Modify this for sending hidden variables, or overriding values
</script>
<script type="text/javascript" src="https://********.marketingautomation.services/client/form.js?ver=1.1.1"></script>
HTML;

    return $embed;
}

Create a new directory inside wp-content/plugins and name it to something like $YOURSITE-sharpspring-embed. Create a PHP file inside (name it like $YOURSITE-sharpspring-embed) that directory and paste the code above into that file. Remember to replace your credentials and app IDs.

Then activate the plugin and use the shortcode [sharpspring_embed] in your post content.

Note: that plugin requires at least PHP version 5.3 (today 5.6 is the current stable version).

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