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docs: clarify the shortcomings of local variable technique for parent-child component interactions (#42331) 

Closes #38302

PR Close #42331
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Joey Perrott 2021-05-25 14:34:28 -07:00 committed by Andrew Kushnir
parent cdb8f556fb
commit fa0144fde6
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7
aio/content/guide/component-interaction.md
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@ -300,8 +300,11 @@ The *local variable* approach is easy. But it is limited because
the parent-child wiring must be done entirely within the parent template.
The parent component *itself* has no access to the child.
You can't use the *local variable* technique if an instance of the parent component *class*
must read or write child component values or must call child component methods.
You can't use the *local variable* technique if the parent component's *class* relies on the
child component's *class*. The parent-child relationship of the components is not established
within each components respective *class* with the *local variable* technique. Since the *class*
instances are not connected to one another, the parent *class* cannot access the child *class*
properties and methods.
When the parent component *class* requires that kind of access,
***inject*** the child component into the parent as a *ViewChild*.