Javascript 使用三元代码反应内联样式
具有如下复选框元素:Javascript 使用三元代码反应内联样式,javascript,reactjs,checkbox,inline,ternary,Javascript,Reactjs,Checkbox,Inline,Ternary,具有如下复选框元素: <Checkbox checked={this.props.someValues.indexOf(myValue) > -1} /> v−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−v−− JSX expression delimiters style={this.props.someValues.indexOf(m
<Checkbox
checked={this.props.someValues.indexOf(myValue) > -1}
/>
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style={this.props.someValues.indexOf(myValue) > -1 ? { color: 'red' } : { color: 'blue' } }
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-1}
/>
当该索引具有正值时,复选框将被选中
我想给复选框添加不同的颜色,例如,如果它未选中-蓝色,选中-红色
所以我试着这样做:
<Checkbox
checked={this.props.someValues.indexOf(myValue) > -1}
{(this.props.someValues.indexOf(myValue) > -1) ? style={{ color: 'red' }} : style={{ color: 'blue' }}}
/>
-1}
{(this.props.someValues.indexOf(myValue)>-1)?style={{color:'red'}}}:style={{{color:'blue'}}}
/>
但它不起作用
另一种尝试:
<Checkbox
checked={this.props.someValues.indexOf(myValue) > -1}
style={(this.props.someValues.indexOf(myValue) > -1) ? {{ color: 'red' }} : {{ color: 'blue' }} }
/>
-1}
style={(this.props.someValues.indexOf(myValue)>-1)?{{color:'red'}}:{{color:'blue'}}}
/>
是否可以使用三元运算符内联设置样式,但我做得不对,还是应该尝试另一种方法?我可能会做的是将其分离到一个生成值的函数中。即使三元运算符适合这种情况,也可能会使代码不那么可读 我会尽量做到:
<Checkbox checked={this.props.someValues.indexOf(myValue) > -1}
style={getStyle()} />
所以你仍然可以保留你的三元运算符,但是要以一种更易读的方式
我希望这有帮助 您的第二次尝试无效,因为您有太多的
{}
。请记住,属性值周围的外部{}
用于分隔JSX表达式;表达式的内容只是JavaScript,因此对象只使用一对{}
但我不会创建单独的对象(尽管这很好),我只会切换出值:
v−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−v−− JSX expression delimiters
style={{color: this.props.someValues.indexOf(myValue) > -1 ? 'red' : 'blue' }}
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但为了完整起见,您的第二次尝试如下所示:
<Checkbox
checked={this.props.someValues.indexOf(myValue) > -1}
/>
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style={this.props.someValues.indexOf(myValue) > -1 ? { color: 'red' } : { color: 'blue' } }
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…这样也很好