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zhongjin
2020-06-13 18:34:34 +08:00
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<!DOCTYPE html>
<html>
<head>
<title>Error handling | CARTO</title>
<meta name="viewport" content="initial-scale=1.0">
<meta charset="utf-8">
<link href="https://fonts.googleapis.com/css?family=Montserrat:400,600,700|Open+Sans:300,400,600" rel="stylesheet">
<link href='https://fonts.googleapis.com/css?family=Open+Sans:300,400,600,700' rel='stylesheet' type='text/css'>
<!-- Include Leaflet -->
<script src="https://unpkg.com/leaflet/dist/leaflet.js"></script>
<link href="https://unpkg.com/leaflet/dist/leaflet.css" rel="stylesheet">
<!-- Include CARTO.js -->
<script src="../../../dist/public/carto.js"></script>
<link href="../style.css" rel="stylesheet">
</head>
<body>
<div id="map"></div>
<aside class="toolbox">
<div class="box">
<header>
<h1>Error handling</h1>
<button class="github-logo js-source-link"></button>
</header>
<section>
<p class="description open-sans">Handle common errors in maps.</p>
<div class="separator"></div>
<section class="usage">
<header>USAGE</header>
<p class="open-sans">In this example we handle the client error while calling the `addLayer` funciton.</p>
<p class="open-sans">See `refreshLayer` function in the source code for an example on how to handle Promise errors.</p>
</section>
<div id="controls">
<div id="info"><p class="mt-16 open-sans"></p></div>
</div>
</section>
<footer class="js-footer"></footer>
</div>
<div class="box widget">
<h2 class="h2">DATASET</h2>
<textarea id="dataset-value" rows=2></textarea>
<button id="dataset-button" class="button" onclick="updateDataset()">SET WRONG DATASET</button>
</div>
<div class="box widget">
<h2 class="h2">STYLE</h2>
<textarea id="style-value" rows="3"></textarea>
<button id="style-button" class="button" onclick="updateStyle()">UPDATE STYLE</button>
</div>
</aside>
<script>
const map = L.map('map').setView([30, 0], 3);
map.scrollWheelZoom.disable();
L.tileLayer('https://{s}.basemaps.cartocdn.com/rastertiles/voyager_nolabels/{z}/{x}/{y}.png', {
maxZoom: 18
}).addTo(map);
const client = new carto.Client({
apiKey: 'default_public',
username: 'cartojs-test'
});
// State
const state = {
isDatasetValid: true,
isStyleValid: true,
errorMessage: '',
updating: false
};
// Datasets
const validDataset = 'ne_10m_populated_places_simple';
const wrongDataset = 'wrong_dataset';
// Style
const validStyle = '#layer { marker-fill: red; }';
const wrongStyle = '#layer { marker-fill: wrong-color; }';
let source = new carto.source.Dataset(validDataset);
let style = new carto.style.CartoCSS(validStyle);
let layer = new carto.layer.Layer(source, style);
client.addLayer(layer);
client.getLeafletLayer().addTo(map);
updateUI();
function refreshLayer (layer) {
client.addLayer(layer)
.then(function () {
state.errorMessage = '';
state.updating = false;
updateUI();
})
.catch(function (error) {
state.errorMessage = error.message;
state.updating = false;
updateUI();
});
}
function updateDataset() {
client.removeLayer(layer);
state.isDatasetValid = !state.isDatasetValid;
state.updating = true;
const dataset = state.isDatasetValid
? validDataset
: wrongDataset;
updateUI();
source = new carto.source.Dataset(dataset);
layer = new carto.layer.Layer(source, style);
refreshLayer(layer);
}
function updateStyle() {
client.removeLayer(layer);
state.isStyleValid = !state.isStyleValid;
state.updating = true;
const styleContent = state.isStyleValid
? validStyle
: wrongStyle;
updateUI();
style = new carto.style.CartoCSS(styleContent);
layer = new carto.layer.Layer(source, style);
refreshLayer(layer);
}
function updateUI () {
const datasetValueEl = document.getElementById('dataset-value');
const styleValueEl = document.getElementById('style-value');
const datasetButtonEl = document.getElementById('dataset-button');
const styleButtonEl = document.getElementById('style-button');
const panelEl = document.querySelector('#info p');
datasetValueEl.value = state.isDatasetValid
? validDataset
: wrongDataset;
styleValueEl.value = state.isStyleValid
? validStyle
: wrongStyle;
datasetButtonEl.textContent = state.isDatasetValid
? 'Set wrong dataset'
: 'Revert to a valid dataset';
styleButtonEl.textContent = state.isStyleValid
? 'Set wrong style'
: 'Revert to a valid style';
panelEl.textContent = state.updating
? 'Updating...'
: state.errorMessage
? state.errorMessage
: 'Everything OK';
if (state.updating) {
panelEl.classList.remove('bg-red');
panelEl.classList.remove('bg-white');
panelEl.classList.add('bg-orange');
panelEl.classList.add('p-8');
panelEl.classList.add('text-white');
} else if (state.errorMessage) {
panelEl.classList.add('bg-red');
panelEl.classList.remove('bg-white');
panelEl.classList.remove('bg-orange');
panelEl.classList.add('p-8');
panelEl.classList.add('text-white');
} else {
panelEl.classList.add('bg-white');
panelEl.classList.remove('bg-red');
panelEl.classList.remove('bg-orange');
panelEl.classList.remove('p-8');
panelEl.classList.remove('text-white');
}
}
</script>
</body>
</html>