
<script>
    // Voor verzenden van formulier een controle uitvoeren. Is veld telefoonnummer ingevuld met waard uit een database, dat wordt opgehaald via een AJAX-aanvraag, dan een alert tonen dat dit niet kan. En het formulier niet verzenden. Pure javascript gebruiken.
    document.addEventListener('DOMContentLoaded', function() {
        const form = document.getElementById('registration-form');
        form.addEventListener('submit', function(event) {
            const phoneInput = form.querySelector('input[name="phone"]');
            const phoneValue = phoneInput.value.trim();

            // AJAX-aanvraag om te controleren of het telefoonnummer al in de database staat
            const xhr = new XMLHttpRequest();
            xhr.open('POST', 'https://www.mechaman.nl/tuin-en-park-techniek/wp-admin/admin-ajax.php', false); // Synchronous request
            xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
            xhr.onload = function() {
                if (xhr.status === 200) {
                    const response = JSON.parse(xhr.responseText);
                    if (response.exists) {
                        alert('Het telefoonnummer is al geregistreerd. U kunt zich niet registreren met dit nummer.');
                        event.preventDefault(); // Voorkom dat het formulier wordt verzonden
                    }
                }
            };
            xhr.send('action=check_phone_number&phone=' + encodeURIComponent(phoneValue));
        });
    });
</script>{"version":"1.0","provider_name":"Tuin en Park Techniek","provider_url":"https:\/\/www.mechaman.nl\/tuin-en-park-techniek","author_name":"Jasper Lentz","author_url":"https:\/\/www.mechaman.nl\/tuin-en-park-techniek\/artikel\/author\/jlentz\/","title":"VIDEO: Conver C86-schuifboot","type":"rich","width":600,"height":338,"html":"<blockquote class=\"wp-embedded-content\" data-secret=\"LrqCkKqYCV\"><a href=\"https:\/\/www.mechaman.nl\/tuin-en-park-techniek\/artikel\/20180411\/video-conver-c86-schuifboot\/\">VIDEO: Conver C86-schuifboot<\/a><\/blockquote><iframe sandbox=\"allow-scripts\" security=\"restricted\" src=\"https:\/\/www.mechaman.nl\/tuin-en-park-techniek\/artikel\/20180411\/video-conver-c86-schuifboot\/embed\/#?secret=LrqCkKqYCV\" width=\"600\" height=\"338\" title=\"&#8220;VIDEO: Conver C86-schuifboot&#8221; &#8212; Tuin en Park Techniek\" data-secret=\"LrqCkKqYCV\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\" class=\"wp-embedded-content\"><\/iframe><script>\n\/*! This file is auto-generated *\/\n!function(d,l){\"use strict\";l.querySelector&&d.addEventListener&&\"undefined\"!=typeof URL&&(d.wp=d.wp||{},d.wp.receiveEmbedMessage||(d.wp.receiveEmbedMessage=function(e){var t=e.data;if((t||t.secret||t.message||t.value)&&!\/[^a-zA-Z0-9]\/.test(t.secret)){for(var s,r,n,a=l.querySelectorAll('iframe[data-secret=\"'+t.secret+'\"]'),o=l.querySelectorAll('blockquote[data-secret=\"'+t.secret+'\"]'),c=new RegExp(\"^https?:$\",\"i\"),i=0;i<o.length;i++)o[i].style.display=\"none\";for(i=0;i<a.length;i++)s=a[i],e.source===s.contentWindow&&(s.removeAttribute(\"style\"),\"height\"===t.message?(1e3<(r=parseInt(t.value,10))?r=1e3:~~r<200&&(r=200),s.height=r):\"link\"===t.message&&(r=new URL(s.getAttribute(\"src\")),n=new URL(t.value),c.test(n.protocol))&&n.host===r.host&&l.activeElement===s&&(d.top.location.href=t.value))}},d.addEventListener(\"message\",d.wp.receiveEmbedMessage,!1),l.addEventListener(\"DOMContentLoaded\",function(){for(var e,t,s=l.querySelectorAll(\"iframe.wp-embedded-content\"),r=0;r<s.length;r++)(t=(e=s[r]).getAttribute(\"data-secret\"))||(t=Math.random().toString(36).substring(2,12),e.src+=\"#?secret=\"+t,e.setAttribute(\"data-secret\",t)),e.contentWindow.postMessage({message:\"ready\",secret:t},\"*\")},!1)))}(window,document);\n\/\/# sourceURL=https:\/\/www.mechaman.nl\/tuin-en-park-techniek\/wp-includes\/js\/wp-embed.min.js\n<\/script>\n","thumbnail_url":"https:\/\/www.mechaman.nl\/tuin-en-park-techniek\/wp-content\/uploads\/sites\/5\/0318_conver-schuifboot-neven-3_resize-768x512.jpg","thumbnail_width":600,"thumbnail_height":400}