Can the default value of a field with id="someidset", set as value="abcdef", be detected if there is no prior information about this default value? I hope the question is clearly understood...
Can the default value of a field with id="someidset", set as value="abcdef", be detected if there is no prior information about this default value? I hope the question is clearly understood...
When you modify the content of an element, it updates the value property but not the value attribute. You can compare these two values to check if there has been a change:
var element = document.getElementById('someidset');
if (element.value != element.getAttribute('value')) {
// value was updated
}
Please note that this method is most reliable for type="text" input fields.
Of course, utilizing the defaultValue property is a great way to go. It's effective for various types of <input /> elements. Just make sure to compare it with the value property.
One important distinction to understand is between attributes and properties.
let exampleElement = document.getElementById('exampleElement');
exampleElement.textContent; // current text content
exampleElement.getAttribute('href'); // initial value of href attribute
For a practical demonstration, click on this link: http://jsfiddle.net/exampleuser/yXfeP/. Then modify the value immediately after the prompt and wait for 10 seconds.
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