Is it feasible to retrieve the value of an input within its attribute?
For instance, if you want the input to be green when not empty without utilizing Vue.data.
For instance:
<v-text-field background-color="'green' ? <THISVAL> : 'red'"></v-text-field>
Or is the usage of v-model and a variable defined in Vue.data necessary?
Absolutely, both the v-model directive and the variable must be defined within the Vue.data object.
Why is this necessary? Vue operates on a virtual DOM concept. During the initial processing of the template, no actual elements exist in the DOM for direct access using this. It's essential to specify in advance what should be rendered into the DOM.
While there is an option to use component-template-refs for obtaining references to real HTML elements, these references are assigned after the component has been mounted and typically not required for scenarios like this.
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