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---
layout: demo_layout.njk
---
## Htmx Pattern: Infinite scroll
The infinite scroll pattern provides a way to load content dynamically on user scrolling action.
Let's focus on the final row:
```html
<tr hx-get="/contacts/?page=2"
hx-trigger="revealed"
hx-swap="afterend">
<td>Agent Smith</td>
<td>void29@null.org</td>
<td>55F49448C0</td>
</tr>
```
This row (or the last element of your content) contains a listener which, when scrolled into view, will trigger a request. The result is then appended after it.
The last element of the results will itself contain the listener to load the *next* page of results, and so on.
{% include demo_ui.html.liquid %}
<script>
server.autoRespondAfter = 1000; // longer response for more drama
//=========================================================================
// Fake Server Side Code
//=========================================================================
// data
var dataStore = function(){
var contactId = 9;
function generateContact() {
contactId++;
var idHash = "";
var possible = "ABCDEFG0123456789";
for( var i=0; i < 10; i++ ) idHash += possible.charAt(Math.floor(Math.random() * possible.length));
return { name: "Agent Smith", email: "void" + contactId + "@null.org", id: idHash }
}
return {
contactsForPage : function(page) {
var vals = [];
for( var i=0; i < 20; i++ ){
vals.push(generateContact());
}
return vals;
}
}
}()
// routes
init("/demo", function(request, params){
var contacts = dataStore.contactsForPage(1)
return tableTemplate(contacts)
});
onGet(/\/contacts.*/, function(request, params){
var page = parseInt(params['page']);
var contacts = dataStore.contactsForPage(page)
return rowsTemplate(page, contacts);
});
// templates
function tableTemplate(contacts) {
return `<table hx-indicator=".htmx-indicator"><thead><tr><th>Name</th><th>Email</th><th>ID</th></tr></thead><tbody>
${rowsTemplate(1, contacts)}
</tbody></table><center><img class="htmx-indicator" width="60" src="/img/bars.svg"></center>`
}
function rowsTemplate(page, contacts) {
var txt = "";
var trigger_attributes = "";
for (var i = 0; i < contacts.length; i++) {
var c = contacts[i];
if (i == (contacts.length - 1)) {
trigger_attributes = ` hx-get="/contacts/?page=${page + 1}" hx-trigger="revealed" hx-swap="afterend"`
}
txt += "<tr" + trigger_attributes +"><td>" + c.name + "</td><td>" + c.email + "</td><td>" + c.id + "</td></tr>\n";
}
return txt;
}
</script>
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