How Can I Track Text Input Changes in Real Time Across Browsers?

As-You-Type Tracking in Text Inputs

onchange events for text inputs typically only trigger after focus is lost. However, for scenarios where you need real-time tracking, there are several options.

oninput Event

Modern browsers support the oninput event, which continuously triggers as the textfield content changes. This eliminates the need for losing focus.

onpropertychange

For Internet Explorer 8 and below, you can use the onpropertychange event.

Event Handling with Input and Property Change

By combining oninput and onpropertychange, you can handle both modern and legacy browsers gracefully:

const source = document.getElementById('source');
const result = document.getElementById('result');

const inputHandler = function(e) {
  result.innerText = e.target.value;
};

source.addEventListener('input', inputHandler);
source.addEventListener('propertychange', inputHandler); // for IE8

Considerations for Select Boxes

Firefox, Edge 18-, and IE9 do not fire onchange events when options are selected in select boxes. For these browsers, consider using a change event listener instead.

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