How can I get all classes length with loop

[Alon]

Hi I m new and I need help som,how can I get all classes length with loop 

[dsonesuk]

You mean like this?

https://www.w3schools.com/code/tryit.asp?filename=G650H6QWET2L

[Alon]

Sorry but there is no option try it yourself and then I wrote on my code play app this is not working,that code I m trying is like this but is wrong please make correct this ,

<p class="post"></p>

<p class="post"></p>

<p id="demo"></p>

<Script>

var  x = 

document.getElementByClassName("post");

document.getElementById("demo").innerHTML=x.length;

</script>

I can get length of classes names with this cod but I can't use loop in this code please do  complete this code with loop 

 

 

[Ingolme]

Why do you need a loop? Is this a homework question?

[dsonesuk]

Option? Don't know what you mean by option? And it's  getElementsByClassName not getElementByClassName.

Edited July 19, 2019 by dsonesuk