渲染方法在内部映射值时打破了 [英] Render Method Breaking When Mapping Value Inside
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问题描述
渲染方法:
导出默认值React.createClass({
更改:function(){
console.log(this.props.classes);
},
render:function(){
return(
< div>
< select onChange = {this.change}>
{
Object.keys .props.classes).map(value,key => {
return< option key = {key}> {value}< / option>
}
)}
< / select>
< / div>
)
}
});
解决方案
回调参数需要额外的括号我认为: p>
导出默认值React.createClass({
更改:function(){
console.log (this.props.classes);
},
render:function(){
return(
< div>
< select onChange = {this.change}>
{
Object.keys(this.props.classes).map((value,key)=> {
return< option key = {key}> {value}< / option>
}
)}
< / select>
< / div>
)
}
});
I have a component (a dropdown list), which should populate the list based on an array which was passed in from another component as the "classes" prop. To make it as efficient as possible, I'm attempting to use Object.keys and Array.prototype.map methods to loop through my array, populate the list, and render. But, whenever I added this component, it causes my entire application to not render at all. I've listed my render method below.
Render Method:
export default React.createClass({
change: function(){
console.log(this.props.classes);
},
render: function(){
return(
<div>
<select onChange = {this.change}>
{
Object.keys(this.props.classes).map(value, key =>{
return <option key = {key}>{value}</option>
}
)}
</select>
</div>
)
}
});
解决方案
The callback parameters need extra parenthesis I think:
export default React.createClass({
change: function(){
console.log(this.props.classes);
},
render: function(){
return(
<div>
<select onChange = {this.change}>
{
Object.keys(this.props.classes).map((value, key) =>{
return <option key = {key}>{value}</option>
}
)}
</select>
</div>
)
}
});
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