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devnull69 · 09-05-2012, 08:01 PM

1. Why are you trying to use .id if you want to access the value? Why not use .value?
2. In II: You assigned an event handler using one of the onxxxxx attributes. In that case the context for the function does not change to be a reference to the DOM object, so "this" will be a reference to the window object instead.
3. In III: getElementsByTagName (mind the 's') will return a collection of DOM objects which is essentially an array. In order to retrieve the first object from the array, you will have to use the index [0] on it

Code:

<input type="button" id="btn1" value="A" onclick="showValue(this)"/>


function showValue(obj) {
   alert(obj.value);
}

09-05-2012, 08:01 PM	PM User \| #2
devnull69 Senior Coder Join Date: Dec 2010 Posts: 2,245 Thanks: 10 Thanked 531 Times in 525 Posts	1. Why are you trying to use .id if you want to access the value? Why not use .value? 2. In II: You assigned an event handler using one of the onxxxxx attributes. In that case the context for the function does not change to be a reference to the DOM object, so "this" will be a reference to the window object instead. 3. In III: getElementsByTagName (mind the 's') will return a collection of DOM objects which is essentially an array. In order to retrieve the first object from the array, you will have to use the index [0] on it Code: <input type="button" id="btn1" value="A" onclick="showValue(this)"/> function showValue(obj) { alert(obj.value); }