In JSX, how do you reference a value from props
from inside a quoted attribute value?
For example:
<img className="image" src="images/{this.props.image}" />
The resulting HTML output is:
<img class="image" src="images/{this.props.image}">
React(或 JSX)不支持属性值内的变量插值,但您可以将任何 JS 表达式放在大括号内作为整个属性值,所以这有效:
<img className="image" src={"images/" + this.props.image} />
如果要使用 es6 模板文字,还需要在刻度线周围加上大括号:
<img className="image" src={`images/${this.props.image}`} />
If you're using JSX with Harmony, you could do this:
<img className="image" src={`images/${this.props.image}`} />
Here you are writing the value of src
as an expression.
Instead of adding variables and strings, you can use the ES6 template strings! Here is an example:
<img className="image" src={`images/${this.props.image}`} />
As for all other JavaScript components inside JSX, use template strings inside of curly braces. To "inject" a variable use a dollar sign followed by curly braces containing the variable you would like to inject. For example:
{`string ${variable} another string`}
Best practices are to add getter method for that :
getImageURI() {
return "images/" + this.props.image;
}
<img className="image" src={this.getImageURI()} />
Then , if you have more logic later on, you can maintain the code smoothly.
For People, looking for answers wrt to 'map' function and dynamic data, here is a working example.
<img src={"http://examole.com/randomview/images" + each_actor['logo']} />
This gives the URL as " http://examole.com/randomview/images/2/dp_pics/182328.jpg " (random example)
Note: In react you can put javascript expression inside curly bracket. We can use this property in this example.
Note: give one look to below example:
class LoginForm extends React.Component {
constructor(props) {
super(props);
this.state = {i:1};
}
handleClick() {
this.setState(prevState => ({i : prevState.i + 1}));
console.log(this.state.j);
}
render() {
return (
<div>
<p onClick={this.handleClick.bind(this)}>Click to change image</p>
<img src={'images/back'+ this.state.i+'.jpg'}/>
</div>
);
}
}
Here is the Best Option for Dynamic className or Props , just do some concatenation like we do in Javascript.
className={
"badge " +
(this.props.value ? "badge-primary " : "badge-danger ") +
" m-4"
}
you can use
<img className="image" src=`images/${this.props.image}`>
or
<img className="image" src={'images/'+this.props.image}>
or
render() {
let imageUrl = this.props.image ? "images/"+this.props.image : 'some placeholder url image';
return (
<div>
<img className="image" src={imageUrl} />
</div>
)
}
你可以这样做
<img className="img" src=`images/${this.props.image}`>
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