Obtaining the clientID when the textbox name is stored in a string variable

I am struggling with the following code intended to check for a blank value in my textbox, but it is resulting in a compilation error. Can someone help me find a solution?

Here is my code in JavaScript:

 function checkTextboxNotFilled(txtbox) {
        var txtb = document.getElementById("<%= " + txtbox + ".ClientID %>");
        if (GetFormattedString(txtb.value) == "") {
            return true ;
        }
        else {
            return false ;
        }
    }

The error message states:

'string' does not contain a definition for 'ClientID' and no extension method 'ClientID' accepting a first argument of type 'string' could be found (are you missing a using directive or an assembly reference?)

I am invoking it like this: checkTextboxNotFilled("MytextboxName")

asp.netjavascript

Answer №1

If you're in need of some assistance, this information could be useful.

 function checkIfTextboxIsEmpty(txtboxID) {
        var txt = document.getElementById(txtboxID);
        if (GetFormattedString(txt.value) == "") {
            return true;
        }
        else {
            return false;
        }
    }

Make sure to call it like this: 

checkIfTextboxIsEmpty("<%= Mytextbox.ClientID %>");

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