javascript - how to judge which button has been clicked using there className instead of ID -

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I have 100 buttons in a table, but the name of the same class is different but different IDs C-1, C -2, ...., cn & lt; Input type = "button" class = "btn-c" id = "c-1" value = "ADD" & gt; How do I know which button is clicked using their classname and whithout & lt; Input type = "button" ... onclick = "call_function (this);" For simplicity, says that I want warning (button id); Click on any of the 100 buttons

If you have a lot of buttons, it It is understood to use the event delegation: 

  $ ('table'). ('Click', '.btn-c', function () {warning (this.id); // will click on the button ID}};

Performance approaches This is an optimum approach because you only force an event handler in parent element and get benefit from child element eventbulbling.

UPD. This is a The pure JavaScript version of the code is: 

  document.getElementById ('Table'). AddEventListener ('click', function (e) {if (/ \ bbtn-c \ b / .test (E. Target.className)) {warning (e.target.id);}}, false);

demo:


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