Create a Custom Element with different sub-types

Question

I am currently implementing a data-table element using custom elements (web components). The table can have different types of cells (text, number, date, etc) that are used

Answer 1

What could be done is using Customized Built-in Element:

Bob

       
11/1/2017
       
44

   

All extensions share the same prototype ancestor. Example:

//common cell
class DataCell extends HTMLTableCellElement {...}

//typed cell
class StringCell extends DataCell {
    renderContent() { ... }
} 
customElements.define( 'data-string', StringCell, { extends: 'td' } )

This way all cells extend the same element, share a common prototype but have their own method implementations.

You can override shared method, and shared method can call specific method of the derived prototype object.

See a running example here:

//table
class DataTable extends HTMLTableElement {
    constructor() { 
        super()
        console.info( 'data-table created' )
    }
} 
customElements.define( 'data-table', DataTable, { extends: 'table' } );

//cell
class DataCell extends HTMLTableCellElement {
    connectedCallback() { 
        console.info( 'cell connected' )
        if ( typeof this.renderContent === 'function' ) 
            this.renderContent()
    }
} 

//cell string
class StringCell extends DataCell {
    renderContent()
    {
        console.info( 'data-string render' )
        this.innerHTML = '"' + this.textContent.trim() + '"'
    }
} 
customElements.define( 'data-string', StringCell, { extends: 'td' } )

table {
    border-collapse: collapse ;
}
td, th {
    border: 1px solid gray ;
    padding: 2px
}

Test Table Extension v1

    

        
Id      
Name    
Age
    
    
        
1       
An      
20
    

        
2       
Bob     
31




Note: If you don't want type extension you can also do it with custom tags. The idea is to have a common prototype and different custom elements that share it (thanks to standard prototype inheritance).
    

             

                                                        
            
            

              
                
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