如何在表单提交中包含聚合物纸张下拉菜单 [英] How to include Polymer paper-dropdown-menu in form submit

问题描述

当我使用 document.getElementById（form）提交此Polymer表单时，submit（）; firstName和lastName包含在POST数据中，但标题来自纸张下拉菜单的价值不是。缺少什么？

When I submit this Polymer form with document.getElementById("form").submit(); firstName and lastName are included in the POST-data, but the title-value from the paper-dropdown-menu not. What is missing ?

<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：

这是我完整的工作示例，非常感谢@Brandon的回答：

Here my complete working example, thanks a lot to @Brandon for his answer:

<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>

推荐答案

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，可用于未来表格的多选。

This may solve your problem. Create a hidden input element and assign the selected item to the hidden element's value. This gives you the added benefit of the iron-input validators for multi-select for future forms.

<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>

这篇关于如何在表单提交中包含聚合物纸张下拉菜单的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！