javascript - 将选择值传递给链接 URL 参数

Question

我有一个购买按钮，用户可以点击该按钮来购买特定产品。
这会将他们带到我构建的购买表单。
该表单上的一个字段使用 URL 参数，因此它知道用户想要购买哪种产品。

所以我想做的是在页面之前的某个位置(Buy 按钮所在的位置)添加一个 HTML 选择字段，并允许用户在那里选择产品。
然后，当他们单击 Buy 按钮时，它会通过 URL 传递所选值。例如:

// Some content here promoting the three products.

// Now I want a select field for the user to choose one of the three products, like this.

<select id="productSelect">
    <option value="product1">Product 1</option>
    <option value="product2">Product 2</option>
    <option value="product3">Product 3</option>
</select>

// Then I have some more content here showing the pros/cons of each product.

// Finally, I have a buy button at the bottom of the page that takes them to the page with the purchase form. 
// Here is where I want to grab the value of the select field and pass it through via the "product" parameter like this.

<a class="button" href="/buy/?product='select value here'">Buy</a>

Answer 1

使用 JavaScript 执行此操作:

document.getElementsByClassName("button")[0].addEventListener("click", function(event) {
    var product = document.getElementById("productSelect").value;
    event.target.setAttribute("href", "/buy?product=" + product);
});

这会起作用。