在提交表单操作中获取变量丢失

Question

当这个表单由onchange事件提交时，它不会保留get变量view。任何想法为什么会这样？提交时，这是它的网址，index?month=February&year=2014

<form action="index?view=list" class="pure-form pure-form-aligned" style="margin:20px;">
    <select name="month" onchange="this.form.submit();">
    <option value="January">January</option>
    <option value="February">February</option>
    </select>
    <select name="year" onchange="this.form.submit();">
    <option value="2014">2014</option>
    <option value="2013">2013</option>
    <option value="2012">2012</option>
    </select>
</form>

Answer 1

只需在表单中添加隐藏的输入字段：

<input type="hidden" name="view" value="list" />