JavaScript match error -


i have following code

var list = document.getelementsbytagname("section"); var counter=0; var output = "";  (var i=0; i<list.length; i++) {   if ( list[i].classname.match(/\bmodule\b/) ) {     var header_text = list[i].getelementsbytagname("h2")[0].innertext;     var ul = list[i].getelementsbyclassname('clips');     var li_list = ul[0].getelementsbyclassname('title');     if ( li_list.length > 1 ) {       output += "------" + header_text + "------" + "     ";       (var y=0; y<li_list.length; y++) {         counter += 1;         output += counter + " - " + li_list[y].innertext + "     ";                  }}}} console.log(output);

and getting error: uncaught typeerror: cannot read property 'match' of undefined. know why happening?

thanks

edit: prasad's answer fixed initial problem getting similar issues getelementsbytagname , getelementsbyclassname

edit: general structure of html following

<body> ...   <section class="module">     <header class>       <div></div>       <div class="side-menu-module-title">         <h2 class="..."></h2>       </div>         </header>   </section>  ... </body>

you missing i on iterating element.its list[i]

for (var i=0; i<list.length; i++) {   if ( list[i].classname.match(/\bmodule\b/) ) {

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