Question

当我提交带有document.getElementById("form").submit();的这个Polymer表单时，firstName和lastName都包含在POST数据中，但是paper-dropdown-menu中的title-value没有。缺少什么？

<form is="iron-form" id="form" method="post" action="/edit">
    <paper-dropdown-menu name="title" label="Title">
        <paper-menu class="dropdown-content">
            <template is="dom-repeat" items="{{titles}}" as="title">
                <paper-item value="{{item.id}}">{{title.name}}</paper-item>
            </template>
        </paper-menu>
    </paper-dropdown-menu>
    <paper-input name="firstName" label="First name"></paper-input>
    <paper-input name="lastName" label="Last name"></paper-input>
    <paper-button raised onclick="submitForm()">Save</paper-button>
</form>

修改

这是我完整的工作实例，非常感谢@Brandon的回答：

<form is="iron-form" id="form" method="post" action="/api/edit">
    <paper-dropdown-menu label="Title" selected-item="{{selectedItem}}" selected-item-label="{{selected}}">
        <paper-menu class="dropdown-content">
            <template is="dom-repeat" items="{{titles}}" as="title">
                <paper-item value="[[title.id]]">[[title.name]]</paper-item>
            </template>
        </paper-menu>
    </paper-dropdown-menu>
    <input is="iron-input" name="title" type="hidden" value$="[[selectedItem.value]]">
    <paper-input name="firstName" label="First name"></paper-input>
    <paper-input name="lastName" label="Last name"></paper-input>
    <paper-button raised onclick="document.getElementById('form').submit()">Save</paper-button>
</form>

Answer 1

这可以解决您的问题。创建隐藏的输入元素，并将所选项目分配给隐藏元素的值。这为您提供了铁输入验证器的额外好处，可以为将来的表格进行多选。

<form is="iron-form" id="form" method="post" action="/edit">
    <paper-dropdown-menu label="Title" selected-item-label="{{selected}}">
        <paper-menu class="dropdown-content">
            <template is="dom-repeat" items="{{titles}}" as="title">
                <paper-item>{{title.name}}</paper-item>
            </template>
        </paper-menu>
    </paper-dropdown-menu>
    <input is="iron-input" name="title" type="hidden" value$="[[selected]]">
    <paper-input name="firstName" label="First name"></paper-input>
    <paper-input name="lastName" label="Last name"></paper-input>
    <paper-button raised onclick="submitForm()">Save</paper-button>
</form>

如何在表单提交中包含Polymer paper-dropdown-menu

1 个答案: