我想让这个地理地图正常运行。Select All用户按下按钮后，状态开始消失。解决方法是什么？
要重现问题，请执行以下步骤：
- 打开这个 jsBin。
- 单击Select All按钮。
- 将鼠标悬停在阿拉斯加州上。
- 请注意，当焦点位于阿拉斯加时，会出现包含州名的悬停文本。
- 选择阿拉斯加州。
- ❌ 注意填充颜色变成了白色。
- ❌ 请注意，所选状态的焦点上不再有任何悬停文本。
- ❌ 尝试再次选择它。注意什么都没有发生。
- 通过选择其他状态重复。
- 单击Clear All按钮。
- ❌ 注意之前选择的状态是白色的并且没有悬停焦点，而它们的邻居填充颜色为灰色并且有悬停文本。
<!DOCTYPE html>
<head>
<meta charset="utf-8">
<base href="https://polygit.org/components/">
<script src="webcomponentsjs/webcomponents-lite.min.js"></script>
<link href="polymer/polymer.html" rel="import">
<link href="google-chart/google-chart.html" rel="import"> </head>
<body>
<dom-module id="x-element">
<template>
<style>
google-chart {
width: 100%;
}
</style>
<br><br><br><br>
<button on-tap="_show">Show Values</button>
<button on-tap="clearAll">Clear All</button>
<button on-tap="selectAll">Select All</button>
<div>[[selectedString]]</div>
<google-chart id="geochart"
type="geo"
options="[[options]]"
data="[[data]]"
on-google-chart-select="_onGoogleChartSelect">
</google-chart>
</template>
<script>
(function() {
// Monkey patch for google-chart
var gcp = Object.getPrototypeOf(document.createElement('google-chart'));
gcp.drawChart = function() {
if (this._canDraw) {
if (!this.options) {
this.options = {};
}
if (!this._chartObject) {
var chartClass = this._chartTypes[this.type];
if (chartClass) {
this._chartObject = new chartClass(this.$.chartdiv);
google.visualization.events.addOneTimeListener(this._chartObject,
'ready', function() {
this.fire('google-chart-render');
}.bind(this));
google.visualization.events.addListener(this._chartObject,
'select', function() {
this.selection = this._chartObject.getSelection();
this.fire('google-chart-select', { selection: this.selection });
}.bind(this));
if (this._chartObject.setSelection){
this._chartObject.setSelection(this.selection);
}
}
}
if (this._chartObject) {
this._chartObject.draw(this._dataTable, this.options);
} else {
this.$.chartdiv.innerHTML = 'Undefined chart type';
}
}
};
Polymer({
is: 'x-element',
/** /
* Fired when user selects chart item.
*
* @event us-map-select
* @param {object} detail Alpabetized array of selected state names.
/**/
properties: {
items: {
type: Array,
value: function() {
return [ 'Alabama', 'Alaska', 'Arizona', 'Arkansas', 'California', 'Colorado', 'Connecticut', 'Delaware', 'Florida', 'Georgia', 'Hawaii', 'Idaho', 'Illinois', 'Indiana', 'Iowa', 'Kansas', 'Kentucky', 'Louisiana', 'Maine', 'Maryland', 'Massachusetts', 'Michigan', 'Minnesota', 'Mississippi', 'Missouri', 'Montana', 'Nebraska', 'Nevada', 'New Hampshire', 'New Jersey', 'New Mexico', 'New York', 'North Carolina', 'North Dakota', 'Ohio', 'Oklahoma', 'Oregon', 'Pennsylvania', 'Rhode Island', 'South Carolina', 'South Dakota', 'Tennessee', 'Texas', 'Utah', 'Vermont', 'Virginia', 'Washington', 'West Virginia', 'Wisconsin', 'Wyoming', ].sort();
},
},
color: {
type: String,
value: 'blue',
},
options: {
type: Object,
computed: '_computeOptions(color)',
},
selected: {
type: Array,
value: function() {
return [];
}
},
data: {
type: Array,
computed: '_computeData(items, selected.length)'
},
selectedString: {
type: String,
computed: '_computeSelectedString(selected.length)',
},
},
_computeOptions: function() {
return {
region: 'US',
displayMode: 'regions',
resolution: 'provinces',
legend: 'none',
defaultColor: 'white',
colorAxis: {
colors: ['#E0E0E0', this.color],
minValue: 0,
maxValue: 1,
}
}
},
// On select event, compute 'selected'
_onGoogleChartSelect: function(e) {
var string = e.path[0].textContent.split('Select')[0].trim(), // e.g. 'Ohio'
selected = this.selected, // Array of selected items
index = selected.indexOf(string);
// If 'string' is not in 'selected' array, add it; else delete it
if (index === -1) {
this.push('selected', string);
} else {
this.splice('selected', index, 1);
}
},
_computeSelectedString: function(selectedInfo) {
return this.selected.sort().join(', ');
},
// After 'items' populates or 'selected' changes, compute 'data'
_computeData: function(items, selectedInfo) {
var data = [],
selected = this.selected,
i = items.length;
while (i--) {
data.unshift([items[i], selected.indexOf(items[i]) > -1 ? 1 : 0]);
}
data.unshift(['State', 'Select']);
return data;
},
clearAll: function() {
this.set('selected', []);
},
selectAll: function() {
this.set('selected', this.items);
},
_show: function() {
//console.log('items', this.items);
console.log('selected', this.selected);
//console.log('data', this.data);
},
});
})();
</script>
</dom-module>
<x-element color="red" selected='["Colorado", "South Dakota"]'></x-element>
</body>
</html>