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index.html
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<html>
<head>
<script
async
src="https://www.googletagservices.com/tag/js/gpt.js"
></script>
<script
async
src="https://cdn.jsdelivr.net/npm/prebid.js@latest/dist/not-for-prod/prebid.js"
></script>
<style>
.slot {
height: 250px;
width: 300px;
display: inline-block;
}
</style>
</head>
<body>
<h2>Example of Ad Batching</h2>
<div class="batch">
<h3>Batch 1</h3>
<span class="slot" id="slot1"></span>
<span class="slot" id="slot2"></span>
</div>
<div style="height: 300px"></div>
<p>Scroll down to request ads in the second batch</p>
<div style="height: 1000px"></div>
<div class="batch">
<h3>Batch 2</h3>
<span class="slot" id="slot3"></span>
<span class="slot" id="slot4"></span>
</div>
<script>
let gptSlots = [];
const slotsData = {
slot1: {
slotId: "slot1",
adUnit: "/6355419/Travel/Europe",
sizes: [[300, 250]],
},
slot2: {
slotId: "slot2",
adUnit: "/6355419/Travel/Europe",
sizes: [[300, 250]],
},
slot3: {
slotId: "slot3",
adUnit: "/6355419/Travel/Europe/France/Paris",
sizes: [300, 250],
},
slot4: {
slotId: "slot4",
adUnit: "/6355419/Travel/Europe",
sizes: [[300, 250]],
},
};
const define = (slot) => {
let gptSlot = googletag
.defineSlot(slot.adUnit, slot.sizes, slot.slotId)
.addService(googletag.pubads());
gptSlot.setTargeting("slotId", slot.slotId);
gptSlots.push(gptSlot);
googletag.display(slot.slotId);
};
const stopObserving = (slot) => {
observer.unobserve(slot.target);
};
const getSlotData = (slot) => {
return slotsData[slot.getAttribute("id")];
};
const callback = (entries) => {
googletag.cmd.push(function () {
// filter out batches outside of the viewport
let entriesInView = entries.filter((entry) => entry.isIntersecting);
// stop observing this batch
entriesInView.forEach(stopObserving);
// get ad slots in this batch
let currentBatch = getSlots(entriesInView);
// define all slots in the current batch
currentBatch.forEach(define);
// request bids for all slots in the current batch
runPrebidAuction(currentBatch);
});
};
const getSlots = (entries) => {
let slots = [];
entries.forEach((entry) => {
entry.target
.querySelectorAll(".slot")
.forEach((slot) => slots.push(getSlotData(slot)));
});
return slots;
};
const runPrebidAuction = (batch) => {
pbjs.que.push(function () {
batch.map((unit) => {
pbjs.addAdUnits(createPrebidAdUnit(unit));
});
pbjs.requestBids({
bidsBackHandler: initAdserver,
});
});
};
const initAdserver = () => {
// add targeting key values to GPT slots
pbjs.setTargetingForGPTAsync();
pbjs.removeAdUnit();
// request ads from GAM
googletag.pubads().refresh(gptSlots);
gptSlots = [];
};
const createPrebidAdUnit = (slot) => {
return {
code: slot.slotId,
mediaTypes: {
banner: {
sizes: slot.sizes,
},
},
bids: [
{
bidder: "appnexus",
params: {
placementId: 13144370,
},
},
],
};
};
window.googletag = window.googletag || {};
window.googletag.cmd = window.googletag.cmd || [];
window.pbjs = window.pbjs || {};
window.pbjs.que = window.pbjs.que || [];
googletag.cmd.push(function () {
googletag.pubads().disableInitialLoad();
googletag.pubads().enableSingleRequest();
googletag.enableServices();
});
let batches = document.querySelectorAll(".batch");
let observer = new IntersectionObserver(callback);
batches.forEach((batch) => {
observer.observe(batch);
});
</script>
</body>
</html>