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The following function doesn’t work for some reason. Can someone see what the problem is?
function checkMaxLen(txt, maxLen) {
var actualLen = txt.value.length;
var remain = maxLen - actualLen;
document.getElementById('remainChar').Value = remain;
}
<input type="text" id="remainChar" runat="server" value="500"/>
Whenever I try to run the function, I get this error:
Microsoft JScript runtime error: Unable to set value of the property ‘Value’: object is null or undefined
Check the ID of the input in your final HTML. Since you have
runat="server"ASP.NET is likely adding its typical container prefixes.