How to edit one of two Google charts on the one page? - charts

Question

I've added Google chart to my page. This returns an images of a charts. It is ok. But I want to edit only one of them and this is problem. It edit only the first one, but I want to edit for example only the second one. Can anybody help me? Here is my code:
//draw charts
google.charts.load('current', {'packages': ['corechart']});
google.charts.setOnLoadCallback(drawChart);
function drawChart() {
var data = new google.visualization.DataTable();
data.addColumn('string', 'Value');
data.addColumn('number', 'Total count');
data.addRows([
["A", 4],
["B", 1],
]);
var options = {
title: "Choose something"
};
var chart = new google.visualization.PieChart(document.getElementById(304));
chart.draw(data, options);
var data305 = new google.visualization.DataTable();
data305.addColumn('string', 'Value');
data305.addColumn('number', 'Total count');
data305.addRows([
["Male", 2],
["Female", 2],
]);
var options305 = {
title: "Gender"
};
var chart305 = new google.visualization.PieChart(document.getElementById(305));
chart305.draw(data305, options305);
}
//edit charts
google.load('visualization', '1.0', {packages: ['charteditor']});
var chartEditor = null;
function loadEditor() {
// Create the chart to edit.
var data = new google.visualization.DataTable();
data.addColumn('string', 'Value');
data.addColumn('number', 'Total count');
data.addRows([
["A", 4],
["B", 1],
]);
var wrapper = new google.visualization.ChartWrapper({
chartType: 'PieChart',
dataTable: data,
options: {'title': 'Pohlavi'},
containerId: '304'
});
chartEditor = new google.visualization.ChartEditor();
google.visualization.events.addListener(chartEditor, 'ok', redrawChart);
chartEditor.openDialog(wrapper, {});
//---------------------------------------
// Create the chart to edit.
var data305 = new google.visualization.DataTable();
data305.addColumn('string', 'Value');
data305.addColumn('number', 'Total count');
data305.addRows([
["Male", 2],
["Female", 2],
]);
var wrapper305 = new google.visualization.ChartWrapper({
chartType: 'PieChart',
dataTable: data,
options: {'title': 'Pohlavi'},
containerId: '305'
});
chartEditor305 = new google.visualization.ChartEditor();
google.visualization.events.addListener(chartEditor305, 'ok', redrawChart);
chartEditor.openDialog(wrapper305, {});
}
// On "OK" save the chart to a <div> on the page.
function redrawChart(inputId){
chartEditor.getChartWrapper().draw(document.getElementById(304));
}
function redrawChart305(inputId){
chartEditor305.getChartWrapper().draw(document.getElementById(305));
}
and here ienter code heres my html:
<script type="text/javascript" src="https://www.google.com/jsapi"></script>
<script type="text/javascript" src="https://www.gstatic.com/charts/loader.js"></script>
<button onclick="loadEditor()">Click me</button>
<div id="304" style="height: 400px; width: 600px;"></div>
<button onclick="loadEditor()">Click me</button>
<div id="305" style="height: 400px; width: 600px;"></div>
<div id="vis_div" style="height: 400px; width: 600px;"></div>
Where is mistake?
Thanks