D3.js：获取所选选项的值？ [英] D3.js: get value of selected option?

问题描述

我想从D3.js中的下拉列表中获取所选选项的值。

I want to get the value of the selected option from a dropdown list, in D3.js.

<select>
<option data-graph="1">1</option>
<option value="2">2</option>
</select>

我看过这个问题，它解释了当选择更改时如何获取值：

I have seen this question which explains how to get the value when the select changes:

d3.select("#myselect").on("change", change)
function change() {
    this.options[this.selectedIndex].value
}

但是如何在页面加载时获取所选的值，

But how can I get the selected value on page load, not when the select is changed?

推荐答案

您不需要使用D3：

var sel = document.getElementById('myselect');
console.log(sel.options[sel.selectedIndex].value)

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