如何验证具有必需属性的纸张无线电组元素 [英] How does one validate paper-radio-group element with required attribute
问题描述
此问题与此问题类似，但未得到回答&是1.0之前的版本.
我需要确保在提交表单
上至少选择了一个paper-radio-button
我可以为每个paper-radio-button放置一个必填属性，但这意味着必须选择每个单选按钮.
This is similar question as this question but it was not answered & is pre 1.0.
I need to ensure that at least one paper-radio-button is selected on form submit
I can place a required attribute to each paper-radio-button but this means every radio-button have to be selected.
<iron-label> Type<br/>
<paper-radio-group name="types" allow-empty-selection attr-for-selected="value" selected="{{model.type}}" noink >
<paper-radio-button name="type" value="home" required> Home</paper-radio-button>
<paper-radio-button name="type" value="work" required> Work</paper-radio-button>
<paper-radio-button name="type" value="portal" required> Portal</paper-radio-button>
<paper-radio-button name="type" value="shipping" required> Shipping</paper-radio-button>
<paper-radio-button name="type" value="billing" required> Billing</paper-radio-button>
<paper-radio-button name="type" value="other" required> Other</paper-radio-button>
</paper-radio-group>
</iron-label>
推荐答案
与其给用户提供不选择任何单选按钮的选项，不如强制进行选择.您可以通过从中删除 allow-empty-selection 来完成此操作paper-radio-group和paper-radio-button中的required属性.我还建议在fallback-selection >，这样model.type中的意外值将导致默认值，例如其他".
Instead of giving the user the option not selecting any radio button, it would be better to force a selection. You can do this by removing allow-empty-selection from paper-radio-group and the required attribute from paper-radio-button. I also recommend using fallback-selection on paper-radio-group so that an unexpected value in model.type would result in a default value, such as "Other".
<head>
<base href="https://polygit.org/polymer+1.11.0/components/">
<script src="webcomponentsjs/webcomponents-lite.js"></script>
<link rel="import" href="polymer/polymer.html">
<link rel="import" href="iron-form/iron-form.html">
<link rel="import" href="iron-label/iron-label.html">
<link rel="import" href="paper-radio-group/paper-radio-group.html">
<link rel="import" href="paper-radio-button/paper-radio-button.html">
<link rel="import" href="paper-button/paper-button.html">
</head>
<body>
<x-form></x-form>
<dom-module id="x-form">
<template>
<iron-form id="form">
<form action="">
<iron-label> Type<br/>
<paper-radio-group name="types" attr-for-selected="value" fallback-selection="other" selected="{{model.type}}" noink>
<paper-radio-button name="type" value="home"> Home</paper-radio-button>
<paper-radio-button name="type" value="work"> Work</paper-radio-button>
<paper-radio-button name="type" value="portal"> Portal</paper-radio-button>
<paper-radio-button name="type" value="shipping"> Shipping</paper-radio-button>
<paper-radio-button name="type" value="billing"> Billing</paper-radio-button>
<paper-radio-button name="type" value="other"> Other</paper-radio-button>
</paper-radio-group>
</iron-label>
<div>
<paper-button on-click="submit">Submit</paper-button>
</div>
</form>
</iron-form>
</template>
<script>
HTMLImports.whenReady(function() {
Polymer({
is: 'x-form',
properties : {
model: {
type: Object,
value: function() { return {type: 'fake'}; }
}
},
submit: function() {
console.log('type', this.model.type);
}
});
});
</script>
</dom-module>
</body>
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