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google-chart.js
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/**
`google-chart` encapsulates Google Charts as a web component, allowing you to easily visualize
data. From simple line charts to complex hierarchical tree maps, the chart element provides a
number of ready-to-use chart types.
<google-chart
type='pie'
options='{"title": "Distribution of days in 2001Q1"}'
cols='[{"label":"Month", "type":"string"}, {"label":"Days", "type":"number"}]'
rows='[["Jan", 31],["Feb", 28],["Mar", 31]]'>
</google-chart>
Note: if you're passing JSON as attributes, single quotes are necessary to be valid JSON.
See https://www.polymer-project.org/1.0/docs/devguide/properties#configuring-object-and-array-properties.
Height and width are specified as style attributes:
google-chart {
height: 300px;
width: 50em;
}
Data can be provided in one of three ways:
- Via the `cols` and `rows` attributes:
cols='[{"label":"Mth", "type":"string"}, {"label":"Days", "type":"number"}]'
rows='[["Jan", 31],["Feb", 28],["Mar", 31]]'
- Via the `data` attribute, passing in the data directly:
data='[["Month", "Days"], ["Jan", 31], ["Feb", 28], ["Mar", 31]]'
- Via the `data` attribute, passing in the URL to a resource containing the
data, in JSON format:
data='http://example.com/chart-data.json'
- Via the `data` attribute, passing in a Google DataTable object:
data='{{dataTable}}'
- Via the `view` attribute, passing in a Google DataView object:
view='{{dataView}}'
You can display the charts in locales other than "en" by setting the `lang` attribute
on the `html` tag of your document.
<html lang="ja">
@demo
*/
/*
FIXME(polymer-modulizer): the above comments were extracted
from HTML and may be out of place here. Review them and
then delete this comment!
*/
import '@polymer/polymer/polymer-legacy.js';
import '@webcomponents/webcomponentsjs/webcomponents-loader.js';
import '@polymer/iron-ajax/iron-request.js';
import { loadScript } from './charts-loader.js';
console.log("Tada")
import './google-chart-styles.js';
import { Polymer } from '@polymer/polymer/lib/legacy/polymer-fn.js';
import { html } from '@polymer/polymer/lib/utils/html-tag.js';
import {loadGCharts} from './google-chart-loader.js'
let isLoaded = false;
export function initGCharts(callback){
loadGCharts(()=>{
if(!isLoaded){
isLoaded = true;
Polymer({
_template: html`
<style include="google-chart-styles"></style>
<google-chart-loader id="loader" type="[[type]]"></google-chart-loader>
<div id="chartdiv"></div>
`,
is: 'google-chart',
/**
* Fired after a chart type is rendered and ready for interaction.
*
* @event google-chart-ready
* @param {{chart: !Object}} The raw chart object.
*/
/**
* Fired when the user makes a selection in the chart.
*
* @event google-chart-select
* @param {{chart: !Object}} The raw chart object.
*/
/** Polymer element properties. */
properties: {
/**
* Sets the type of the chart.
*
* Should be one of:
* - `area`
* - `(md-)bar`
* - `bubble`
* - `calendar`
* - `candlestick`
* - `column`
* - `combo`
* - `gauge`
* - `geo`
* - `histogram`
* - `(md-)line`
* - `org`
* - `pie`
* - `sankey`
* - `(md-)scatter`
* - `stepped-area`
* - `table`
* - `timeline`
* - `treemap`
* - `wordtree`
*
* See <a href="https://google-developers.appspot.com/chart/interactive/docs/gallery">Google Visualization API reference (Chart Gallery)</a>
* for details.
*
* @attribute type
* @type string
*/
type: {
type: String,
value: 'column',
observer: '_typeChanged'
},
/**
* Enumerates the chart events that should be fired.
*
* Charts support a variety of events. By default, this element only
* fires on `ready` and `select`. If you would like to be notified of
* other chart events, use this property to list them.
* Events `ready` and `select` are always fired.
* Changes to this property are _not_ observed. Events are attached only
* at chart construction time.
*
* @attribute events
* @type !Array
*/
events: {
type: Array,
value: function() { return []; }
},
/**
* Sets the options for the chart.
*
* Example:
* <pre>{
* title: "Chart title goes here",
* hAxis: {title: "Categories"},
* vAxis: {title: "Values", minValue: 0, maxValue: 2},
* legend: "none"
* };</pre>
* See <a href="https://google-developers.appspot.com/chart/interactive/docs/gallery">Google Visualization API reference (Chart Gallery)</a>
* for the options available to each chart type.
*
* This property is observed via a deep object observer.
* If you would like to make changes to a sub-property, be sure to use the
* Polymer method `set`: `googleChart.set('options.vAxis.logScale', true)`
* (Note: Missing parent properties are not automatically created.)
*
* @attribute options
* @type {!Object|undefined}
*/
options: {
type: Object
},
/**
* Sets the data columns for this object.
*
* When specifying data with `cols` you must also specify `rows`, and
* not specify `data`.
*
* Example:
* <pre>[{label: "Categories", type: "string"},
* {label: "Value", type: "number"}]</pre>
* See <a href="https://google-developers.appspot.com/chart/interactive/docs/reference#DataTable_addColumn">Google Visualization API reference (addColumn)</a>
* for column definition format.
*
* @attribute cols
* @type {!Array|undefined}
*/
cols: {
type: Array,
observer: '_rowsOrColumnsChanged',
},
/**
* Sets the data rows for this object.
*
* When specifying data with `rows` you must also specify `cols`, and
* not specify `data`.
*
* Example:
* <pre>[["Category 1", 1.0],
* ["Category 2", 1.1]]</pre>
* See <a href="https://google-developers.appspot.com/chart/interactive/docs/reference#addrow">Google Visualization API reference (addRow)</a>
* for row format.
*
* @attribute rows
* @type {!Array<!Array>|undefined}
*/
rows: {
type: Array,
observer: '_rowsOrColumnsChanged',
},
/**
* Sets the entire dataset for this object.
* Can be used to provide the data directly, or to provide a URL from
* which to request the data.
*
* The data format can be a two-dimensional array or the DataTable format
* expected by Google Charts.
* See <a href="https://google-developers.appspot.com/chart/interactive/docs/reference#DataTable">Google Visualization API reference (DataTable constructor)</a>
* for data table format details.
*
* When specifying data with `data` you must not specify `cols` or `rows`.
*
* Example:
* <pre>[["Categories", "Value"],
* ["Category 1", 1.0],
* ["Category 2", 1.1]]</pre>
*
* @attribute data
* @type {!google.visualization.DataTable|
* !Array<!Array>|
* !{cols: !Array, rows: (!Array<!Array>|undefined)}|
* string|
* undefined}
*/
data: {
type: String,
observer: '_dataChanged'
},
/**
* Sets the entire dataset for this object to a Google DataView.
*
* See <a href="https://google-developers.appspot.com/chart/interactive/docs/reference#dataview-class">Google Visualization API reference (DataView)</a>
* for details.
*
* When specifying data with `view` you must not specify `data`, `cols` or `rows`.
*
* @attribute view
* @type {!google.visualization.DataView|undefined}
*/
view: {
type: Object,
observer: '_viewChanged'
},
/**
* Selected datapoint(s) in the chart.
*
* An array of objects, each with a numeric row and/or column property.
* `row` and `column` are the zero-based row or column number of an item
* in the data table to select.
*
* To select a whole column, set row to null;
* to select a whole row, set column to null.
*
* Example:
* <pre>
* [{row:0,column:1}, {row:1, column:null}]
* </pre>
*
* @attribute selection
* @type {!Array|undefined}
*/
selection: {
type: Array,
notify: true,
observer: '_setSelection'
},
/**
* Whether the chart is currently rendered.
*
* @type boolean
*/
drawn: {
type: Boolean,
readOnly: true,
value: false
},
},
observers: [
'_draw(_chart, _dataView)',
'_subOptionChanged(options.*)'
],
listeners: {
'google-chart-select': '_updateSelection',
'google-chart-ready': '_onChartReady'
},
/** @type Object Internal Google Visualization chart object */
_chart: null,
/** @type google.visualization.DataView Internal data state */
_dataView: null,
/** @type Array Internal selection state */
_selection: null,
// The chart type was changed.
// We need to create a new chart and redraw.
_typeChanged: function() {
this.$.loader.create(this.type, this.$.chartdiv)
.then(function(chart) {
var loader = this.$.loader;
Object.keys(this.events.concat(['select', 'ready'])
.reduce(function(set, eventName) {
set[eventName] = true;
return set;
}, {}))
.forEach(function(eventName) {
loader.fireOnChartEvent(chart, eventName);
});
this._setDrawn(false);
this._chart = chart;
}.bind(this));
},
_subOptionChanged: function(optionChangeDetails) {
this.options = optionChangeDetails.base;
// Debounce to allow for multiple option changes in one redraw
this.debounce('optionChangeRedraw', function() {
this.redraw();
}, 5);
},
_setSelection: function() {
// Note: Some charts (e.g. TreeMap) must have a selection.
if (!this.drawn || !this.selection || this.selection === this._selection) {
return;
}
if (this._chart.setSelection) {
this._chart.setSelection(this.selection);
}
this._selection = this.selection;
},
_updateSelection: function() {
this.selection = this._selection = this._chart.getSelection();
},
_onChartReady: function() {
this._setDrawn(true);
this._selection = null;
this._setSelection();
},
/**
* Redraws the chart.
*
* Called automatically when data/type/selection attributes change.
* Call manually to handle view updates, page resizes, etc.
*
* @method redraw
*/
redraw: function() {
if (!this._chart || !this._dataView) { return; }
this._draw(this._chart, this._dataView);
},
/**
* Renders the chart using the provided data.
* @param {Object|undefined} chart Internal Google Visualization chart object.
* @param {google.visualization.DataView|undefined} data Internal data state
*/
_draw: function(chart, data) {
if(chart == null || data == null) {
return;
}
try {
this._setDrawn(false);
chart.draw(data, this.options || {});
} catch(error) {
this.$.chartdiv.innerHTML = error;
}
},
/**
* Returns the chart serialized as an image URI.
*
* Call this after the chart is drawn (google-chart-render event).
*
* @return {?string} Returns image URI.
*/
get imageURI() {
if (!this._chart) { return null; }
return this._chart.getImageURI();
},
/**
* Handles changes to the `view` attribute.
*
* @param {!google.visualization.DataView|undefined} view The new view value
*/
_viewChanged: function(view) {
if (!view) { return; }
this._dataView = view;
},
// Handles changes to the rows & columns attributes.
_rowsOrColumnsChanged: function() {
var rows = this.rows, cols = this.cols;
if (!rows || !cols) { return; }
this.$.loader.dataTable()
.then(function(dataTable) {
cols.forEach(function(col) {
dataTable.addColumn(col);
});
dataTable.addRows(rows);
return dataTable;
}.bind(this))
.then(this.$.loader.dataView.bind(this.$.loader))
.then(function(dataView) {
this._dataView = dataView;
}.bind(this))
.catch(function(reason) {
this.$.chartdiv.innerHTML = reason;
}.bind(this));
},
/**
* Handles changes to the `data` attribute.
*
* @param {
* !google.visualization.DataTable|
* !Array<!Array>|
* !{cols: !Array, rows: (!Array<!Array>|undefined)}|
* string|
* undefined} data The new data value
*/
_dataChanged: function(data) {
var dataPromise;
if (!data) { return; }
var isString = false;
// Polymer 2 will not call observer if type:Object is set and fails, so
// we must parse the string ourselves.
try {
data = JSON.parse(data);
} catch (e) {
isString = typeof data == 'string' || data instanceof String;
}
if (isString) {
// Load data asynchronously, from external URL.
var request = /** @type {!IronRequestElement} */ (document.createElement('iron-request'));
dataPromise = request.send({
url: /** @type string */(data), handleAs: 'json'
}).then(function(xhr) {
return xhr.response;
});
} else {
// Data is all ready to be processed.
dataPromise = Promise.resolve(data);
}
dataPromise
.then(this.$.loader.dataTable.bind(this.$.loader))
.then(this.$.loader.dataView.bind(this.$.loader))
.then(function(dataView) {
this._dataView = dataView;
}.bind(this));
}
});
callback();
} else{
callback();
}
});
}