Four ways to implement two-way binding in Vue

This article mainly introduces the four methods of Vue to achieve two-way binding. It is very good and has reference value. Friends who need it can refer to it

1. v-model Instruction

The above example is just syntax sugar, which is expanded to:

2. .sync modifier

This is also a syntax sugar, peeled off it is:

my-dialog component when visible changesthis.$emit('update:visible', newVisible)is enough.

3. model attribute (in JSX/rendering function)

Vue allows custom component v- after version 2.2.0 model, this leads to the need to consider different configurations of components when implementing v-model in JSX/rendering functions, which cannot always be the case (suppose the model of the my-dialog component is { prop: 'visible', event: 'change' }):

{ render(h) { return h('my-dialog', { props: { value: this.dialogVisible }, on: { input: newVisible => this.dialogVisible = newVisible } }) } }

This should be the case:

{ render(h) { return h('my-dialog', { props: { visible: this.dialogVisible }, on: { change: newVisible => this.dialogVisible = newVisible } }) } }

However, using the model attribute, you can completely ignore its prop and event purposes:

{ render(h) { return h('my-dialog', { model: { value: this.dialogVisible, callback: newVisible => this.dialogVisible = newVisible } }) } }

Used like this in JSX:

{ render() { return (  this.dialogVisible = newVisible } }} /> ) } }

4. vue-better-sync plug-in

There is a demand for this: develop a Prompt component that requires synchronization of user input. Click the button to Close the pop-up window.

Generally we will do this:

It’s okay to write one or two components. Once the size of the component is expanded, writing two-way binding can really cause problems. So, in order to liberate productivity, we have the wheel of vue-better-sync, and let’s see how to use it to transform our Prompt component:

The above is what I compiled for everyone. I hope it will be helpful to everyone in the future.

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