Onkeypress doesn't detect first character

I am trying to remove watermark of text box on enter of first character I have written event of key press, after enter of key it returns length of zero on first character. I tried key up, problem with key up is when some one holds continuously the key the water mark doesn't hide:

<input type="text" autocomplete="off" id="txtHomeSearch"  onkeyup="javascript:CheckInputLength(this,'开发者_Go百科lblwatermark')"/>

function CheckInputLength(e,labelid) {
    if (e.value.length != 0) {
        $(labelid).className = 'NewHP_LabelSearch';
        $(labelid).hide();
    }
}

The water mark doesn't hide on onkeypress event.

Please help me out

Is there any event detects the on change of text box for first character and copy paste..

The keypress event happens before the key is accepted by the <input>. (People use this to prevent the <input> from accepting the event.) You want to use the input event, which fires after the value has changed.

change this onkeyup="javascript:CheckInputLength(this,'lblwatermark')" to this onchange="CheckInputLength(this,'#lblwatermark')"

You needed to add in a # character in the beginning to make it a valid id selector. Also the javascript: thing is not needed so took it out.

Edit: reread question. It looks like poster wants the onchange event for the input