javascript - validate input for jquery -

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i haven`t form, input html:

<script src="index.js"></script> </head> <body> <p>name</p> <input type="text" size="15" id="title"  placeholder="enter title" onclick="check(this)"> <p>description</p> <textarea rows="7" cols="20" id="description"  placeholder="enter description"> </textarea> <p>price</p> <input type ="number" value="00.0" min="0" step="0.1" id="price"><br> <button id="add_new_product" >add new product</button><br> <a href="catalog.html">all product</a> </body>

i must validate input on empty. js file:

$(function(){      $('#add_new_product').click(function(){          var title = $("#title").val();         var description = $("#description").val();         var price = $("#price").val();          $.ajax({url:'adres/add_new_product',type:'get', data:{description:description,title:title, price:price},success:function(result){     alert('product add!)');            }         });      }); });  $(document).ready(function(){      $.ajax({url:'adres/all_products', type: 'get', datatype: 'json', success:function(result){         for(var = 0; < result.length; i++){             $('#list_of_products').append('<b>' + result[i].name + '</b><br>' + result[i].description + '</br><br>'+result[i].price+'<br><br>');}     }}); });

simple, can call javascript function while new product button clicked.

replace 

<button id="add_new_product" >add new product</button><br>

with 

 <button id="add_new_product" onclick="javascript: validatefield()" >add new product</button><br>

in validatefield() function can validate field.

refer , http://jsfiddle.net/nwwl4/19/


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