javascript - HTML form returns NULL fields -

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i have basic form several fields want validate before submitting code. when pass form data js says fields null. please? im new @ js please patient me. relevant form. theres button toggle forms display dont think has effect on this. 

<div id = "new_bk" style="display: none;">     <form id = "new_book" onsubmit = "javscript: return(formvalidate());">         book name:<br>         <input type="text" name="book_name">          <br>         author name:<br>         <input type="text" name="author_name">          <br>         isbn:<br>         <input type="text" name="isbn">          <br>         release date:<br>         <input type="text" name="release_date">          <br>         price:<br>         <input type="text" name="price">          <br>         stock:<br>         <input type="text" name="stock">          <br>         sold:<br>         <input type="text" name="sold">          <br>         restock amount:<br>         <input type="text" name="restock">          <br>         rating:<br>         <input type="text" name="rating">          <br>         reviews:<br>         <input type="text" name="reviews">          <br>         <input type="submit" value="submit">     </form> </div>

and js 

function formvalidate(){     // if(document.getelementbyid("book_name").value.length>0){     //     alert("ok");     // }else{     //     alert("not ok");     // }     alert("name is: "  + document.getelementbyid('book_name').value);     if(document.new_book.book_name.value == ""){         alert("sdkg");         return false;     }     return true; }

however not trigger alert box. , if switch 

alert(document.getelementbyid('book_name'));

it gives me null.

any , appreciated. oh , in case matters. js in external file referenced @ end of body tag of html file.

update

the form sends data correctly now. odd happens. 

alert("1");  if(document.new_book.book_name.value == ''){     alert("input book name please");     return false; }  alert("2");

this code segment trigger alert("1") end. neither fail scenario alert nor alert("2") triggered. ideas why?

for code:

alert(document.getelementbyid('book_name'));

notice textbox has no id attribute trying traget.

<input type="text" name="book_name">

change add id attribute:

<input type="text" id="book_name" name="book_name">

and work.


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