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69 lines
1.7 KiB
Markdown
69 lines
1.7 KiB
Markdown
---
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title: Change Inline CSS Conditionally Based on Component State
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---
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## Change Inline CSS Conditionally Based on Component State
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## Hint 1:
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You are going to be checking the length of ```this.state.input``` so use its ```.length``` property.
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```
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this.state.input.length
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```
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## Hint 2:
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You are entering code before the return statement so you can use a pure JavaScript ```if/then``` statement.
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## Solution:
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You will use an ```if/then``` statement to check the value of ```this.state.input.length```. If it is longer than 15, assign ```'3px solid red'``` to ```inputStyle.border```.
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```jsx
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class GateKeeper extends React.Component {
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constructor(props) {
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super(props);
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this.state = {
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input: ''
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};
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this.handleChange = this.handleChange.bind(this);
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}
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handleChange(event) {
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this.setState({ input: event.target.value })
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}
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render() {
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let inputStyle = {
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border: '1px solid black'
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};
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// change code below this line
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if (this.state.input.length > 15) {
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inputStyle.border = '3px solid red';
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}
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// change code above this line
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return (
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<div>
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<h3>Don't Type Too Much:</h3>
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<input
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type="text"
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style={inputStyle}
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value={this.state.input}
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onChange={this.handleChange} />
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</div>
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);
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}
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};
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```
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<!-- The article goes here, in GitHub-flavored Markdown. Feel free to add YouTube videos, images, and CodePen/JSBin embeds -->
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## Solution
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Write a conditional statement that is evaluated according to your state, as mentioned in the challenge description, checks the length of the input and assigns a new object to the inputStyle variable.
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```jsx
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if (this.state.input.length > 15) {
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inputStyle = {
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border: '3px solid red'
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}
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}
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```
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