Take a look at this simple calculator (
However, when using this approach, the live update feature for the difference does not work. Can you provide guidance on how to make it functional?
Take a look at this simple calculator (
However, when using this approach, the live update feature for the difference does not work. Can you provide guidance on how to make it functional?
When dealing with reactivity in Lit, it's important to note that it is based on reference equality. This means that simply mutating an object will not automatically trigger an update.
There are a couple of approaches you can take to address this:
this.requestUpdate() manuallyBy doing this, you inform Lit to re-render the component.
@property()
obj = {value1: 3, value2: 0}
render() {
return html`
<input type="number"
.value=${this.obj.value1}
@change=${(e) => {
this.obj.value1 = e.target.value;
this.requestUpdate();
}}>
<input type="number"
.value=${this.obj.value2}
@change=${(e) => {
this.obj.value2 = e.target.value;
this.requestUpdate();
}}>
<p>Difference: ${this.obj.value1 - this.obj.value2}</p>`;
}
By creating a new reference for the object, Lit can detect the property change and re-render accordingly.
@property()
obj = {value1: 3, value2: 0}
render() {
return html`
<input type="number"
.value=${this.obj.value1}
@change=${(e) => this.obj = {...this.data, value1: e.target.value}}>
<input type="number"
.value=${this.obj.value2}
@change=${(e) => this.obj = {...this.data, value2: e.target.value}}>
<p>Difference: ${this.obj.value1 - this.obj.value2}</p>`;
}
If working with complex objects, using a library like immer may be beneficial.
For more information, refer to this link:
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