On click get button Value

Try this.

<input type='button' value='Generate' onclick='f1(this)' />

Now alert like

function f1(objButton){  
    alert(objButton.value);
}

P.S: val() is actually a jQuery implementation of value

Or you do this:

<button id='button' value='Generate' onclick='f1()'>Generate</button>

Then this for javascript:

Const click = document.getElementById('button')
Function f1{
  Alert(`${click.Value}`)
}

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