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Improve progressive results loading

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Edward Betts 2026-05-21 09:52:58 +01:00
parent 9691632f65
commit 378d2484d0
6 changed files with 369 additions and 60 deletions
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templates/results_loading.html Normal file
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{% extends "base.html" %}
{% block title %}{% if journey_type == 'inbound' %}{{ destination }} to {{ departure_station_name }} via Eurostar{% elif journey_type == 'return' %}{{ departure_station_name }} to {{ destination }} return via Eurostar{% else %}{{ departure_station_name }} to {{ destination }} via Eurostar{% endif %}{% endblock %}
{% block og_title %}{{ self.title()|trim }}{% endblock %}
{% block og_description %}Train options from {{ departure_station_name }} to {{ destination }} via Paddington, St Pancras, and Eurostar.{% endblock %}
{% block twitter_title %}{{ self.title()|trim }}{% endblock %}
{% block twitter_description %}Train options from {{ departure_station_name }} to {{ destination }} via Paddington, St Pancras, and Eurostar.{% endblock %}
{% block content %}
<p class="back-link">
<a href="{{ index_url }}">&larr; New search</a>
</p>
<div class="card" style="margin-bottom:1.5rem">
<h2>
{% if journey_type == 'inbound' %}
{{ destination }} &rarr; {{ departure_station_name }}
{% elif journey_type == 'return' %}
{{ departure_station_name }} &harr; {{ destination }}
{% else %}
{{ departure_station_name }} &rarr; {{ destination }}
{% endif %}
</h2>
<p class="card-meta">
{{ travel_date_display }}{% if return_date %} to {{ return_date }}{% endif %}
</p>
<div class="loading-panel" role="status" aria-live="polite">
<span class="spinner" aria-hidden="true"></span>
<div>
<strong>Loading train times and fares</strong>
<p class="text-muted text-sm">Fetching National Rail, Eurostar, and fare data. Results will appear here as soon as they are ready.</p>
</div>
</div>
<noscript>
<p><a href="{{ full_results_url }}">Load results</a></p>
</noscript>
</div>
<script>
(function() {
function runScripts(root) {
root.querySelectorAll('script').forEach(function(oldScript) {
var script = document.createElement('script');
for (var i = 0; i < oldScript.attributes.length; i++) {
var attr = oldScript.attributes[i];
script.setAttribute(attr.name, attr.value);
}
script.text = oldScript.text;
oldScript.parentNode.replaceChild(script, oldScript);
});
}
fetch({{ full_results_url|tojson }}, {headers: {'X-Requested-With': 'fetch'}})
.then(function(response) {
if (!response.ok) throw new Error('Could not load results');
return response.text();
})
.then(function(html) {
var doc = new DOMParser().parseFromString(html, 'text/html');
document.title = doc.title;
var nextMain = doc.querySelector('main');
var currentMain = document.querySelector('main');
if (!nextMain || !currentMain) throw new Error('Results page was incomplete');
currentMain.innerHTML = nextMain.innerHTML;
runScripts(currentMain);
history.replaceState(null, '', window.location.href);
})
.catch(function() {
var panel = document.querySelector('.loading-panel');
if (panel) {
panel.innerHTML = '<div><strong>Could not load results</strong><p class="text-muted text-sm"><a href="{{ full_results_url }}">Try loading the full results page</a>.</p></div>';
}
});
})();
</script>
{% endblock %}