javascript - Uncaught TypeError: Cannot set property 'innerHTML' of null in Character Counting in multiple textareas -


i coding page separately count characters in multiple textareas. function works fine, having error of 'uncaught typeerror: cannot set property 'innerhtml' of null' while starting type in first textarea. 2 questioned parts in console highlighted below.

can please help? how can fixed? thank much!

enter image description here

<script>   		function textcounter(textfield, showcountfield, maxamount,id) {  			if (textfield.value.length <= maxamount) {  				showcountfield.value = maxamount - textfield.value.length;  				document.getelementbyid('go'+id).innerhtml  = '';  			} else {   				document.getelementbyid('go'+id).innerhtml  = '<span style="color:red">over!!</span>';  				textfield.value = textfield.value.substring(0,maxamount);  			}  			}  </script>
<body>  		<form>  			<textarea id="q" name="w" onkeyup="textcounter(this.form.q,this.form.w,5,1);" onkeypress="textcounter(this.form.q,this.form.w,5);"></textarea><br>        <input type="text" name="w" value="5"></input>  			<p id="go1"/>  		</form><br>  		<form>  			<textarea id="a" name="s" onkeyup="textcounter(this.form.a,this.form.s,8,2);" onkeypress="textcounter(this.form.a,this.form.s,8); "></textarea><br>        <input type="text" name="s" value="8"></input>  			<p id="go2"/>  		</form><br>    </body>

the listeners onkeypress passing 3 arguments textcounter function requires 4. fourth argument, id, treated undefined , call document.getelementbyid searching element id of goundefined.

compare:

onkeyup="textcounter(this.form.q,this.form.w,5,1);"  onkeypress="textcounter(this.form.q,this.form.w,5);"

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