我仍在学习 React 和 Javascript,所以感谢您的耐心等待。
我正在尝试序列化表单数据,以便将其发送到 Ruby on Rails 后端进行处理。我只是使用普通 React,没有额外的依赖项,例如 Flux、Redux 等。
似乎我的子组件没有返回任何内容,我不太确定为什么。
我已经尝试过:
- 通过使用 ref 来公开值(但失败了,并且发现这样做并不是一个好主意)
- 在我的子组件中公开父方法,以收集有关每个单独组件的信息(您将在我的 jsfiddle 中看到)。
- 通过 onChange 方法更新组件状态并尝试访问每个子组件的状态
我的 JSFiddle: https://jsfiddle.net/morahood/0ptdpfu7/91/
我在这里显然错过了 React 设计模式的一个关键元素。我是不是偏离了轨道?我怎样才能回到正轨?我希望最终能够以以下格式序列化表单数据
{
"service_request" : {
"services" : [
{
"service_item" : ["Oil Change", "New Windshield Wipers"],
"customer" : "Troy",
"manufacturer" : "Ford",
"model" : "F150"
},
{
"service_item" : ["Tire Rotation"],
"customer" : "Dave",
"manufacturer" : "Hyundai",
"model" : "Genesis"
}
]
}
}
组件
var ServiceForm = React.createClass({
render: function() {
return (
<form onSubmit={ this.handleFormSubmission }>
{ this.state.serviceItems.map(function(item) {
return (item);
})}
<div className="btn btn-default btn-sm" onClick={ this.addServiceItem }>+ Append New Service Item</div>
<button type="submit" className="btn btn-success btn-lg pull-right">Submit</button>
</form>
);
},
getInitialState: function() {
return ({
serviceItems: [<ServiceItem serializeServiceItem={ this.serializeServiceItem } />]
});
},
handleFormSubmission: function() {
console.log("form submitted!");
alert("Serialized Form Data: " + this.serializeFormData());
},
addServiceItem: function(event) {
var serviceItems = this.state.serviceItems;
serviceItems.push(<ServiceItem serializeServiceItem={ this.serializeServiceItem } />);
this.setState({
serviceItems: serviceItems
});
},
serializeServiceItem: function() {
var jsonData = {
"service_item" : this.state.service_items,
"customer" : this.state.customer,
"manufacturer" : this.state.manufacturer,
"model" : this.state.model
}
return (jsonData);
},
serializeFormData: function() {
return( this.state.serviceItems.map(function(item) {
return (item.serializeServiceItem);
}));
}
});
var ServiceItem = React.createClass({
render: function() {
return (
<div className="row">
<div className="col-sm-3">
<div className="form-group">
<label>Service Item </label>
<select multiple name="service_item" selected={ this.state.service_items } className="form-control">
<option>Oil Change</option>
<option>Tire Rotation</option>
<option>New Wiper Blades</option>
</select>
</div>
</div>
<div className="col-sm-3">
<div className="form-group">
<label>Customer </label>
<select name="customer" selected={ this.state.customer } className="form-control">
<option>Troy</option>
<option>Dave</option>
<option>Brandon</option>
</select>
</div>
</div>
<div className="col-sm-3">
<div className="form-group">
<label>Manufacturer </label>
<div className="input-group">
<input name="manufacturer" value={ this.state.manufacturer } onChange={ this.setManufacturer } type="text" className="form-control" />
</div>
</div>
</div>
<div className="col-sm-3">
<div className="form-group">
<label>Model </label>
<div className="input-group">
<input name="model" value={ this.state.model } onChange={ this.setModel } type="text" className="form-control" />
</div>
</div>
</div>
</div>
);
},
getInitialState: function() {
return({
service_items: [],
customer: "",
manufacturer: "",
model: ""
});
},
setModel: function(event) {
this.setState({ model: event.target.value });
},
setManufacturer: function(event) {
this.setState({ manufacturer: event.target.value });
},
setCustomer: function(event) {
this.setState({ customer: event.target.selected });
},
setServiceItems: function(event) {
this.setState({ service_items: event.target.selected });
}
});
ReactDOM.render(
<ServiceForm />,
document.getElementById('container')
);
解决方案
最佳答案
你“可能”让事情变得过于复杂了。 <form>
的 DOM 元素实际上可以将其视为所有内部 <input>
的数组元素。换句话说,如果您有:
render: function() {
return (
<form ref="form">
...
</form>
);
}
您的所有输入元素都可以通过以下方式访问:
serialized = {}
for (var i in this.refs.form) {
var input = this.refs.form[i];
serialized[input.name] = input.value;
}
<小时/>
这可能无法为您提供足够的灵 active 。更好的解决方案可能是在组件实例中定义返回输入值的方法:
var ServiceForm = React.createClass({
serializeFormData: function() {
return {
foo: this.refs.foo.serialize()
};
},
render: function() {
var foo = this.state.foo;
return (
<ServiceItem data={foo} ref="foo" />
);
}
});
var ServiceItem = React.createClass({
serialize: function() {
return {
model: this.refs.model.value,
...
}
},
render: function() {
var model = this.props.data.model;
return (
<input ref="model" value={model} ... />
);
}
});
<小时/>
如果您需要多个服务项目,您可能需要依赖this.props.children
访问每个组件实例而不是 this.refs
:
var ServiceContainer = React.createClass({
collectFormData: function() {
return this.refs.form.serialize();
},
renderServiceItem: function(item, i) {
return (
<ServiceItem data={item} key={i} />
);
},
render: function() {
// Assuming you've moved all your state logic into this ServiceContainer
var serviceItems = this.state.serviceItems;
return (
<ServiceForm ref="form">
{serviceItems.map(this.renderServiceItem)}
</ServiceForm>
);
}
});
var ServiceForm = React.createClass({
serialize: function() {
return React.Children.map(this.props.children, function(item) {
return item.serialize();
});
},
render: function() {
return (
<div>{this.props.children}</div>
);
}
});
var ServiceItem = React.createClass({
serialize: function() {
// You can still access your input elements through refs in here
...
},
render: function() {
...
}
});
请注意,我正在使用 React.Children
在这里而不是简单地使用 this.props.children
因为当只有一个 child 时,children
不是数组(请参阅: https://facebook.github.io/react/tips/children-props-type.html )。
关于javascript - 如何让我的组件返回其自身的序列化?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/35233541/