Jquery validation spring mvc - spring

Question

I have a "Create an account" form that is handled by spring. I am using jquery to auto-update some of the fields.
<script type="text/javascript">
$().ready(
function() {
$("#item1").keyup(function() {
var text= (this).value;
//modify text
$("#item4").val(text);
});
});
</script>
<form:form action="${form_url}" method="POST" modelAttribute="object" enctype="${enctype}">
<label for="Item1">Item1:</label>
<input type="text" id="item1" name="item_1"/>
<br></br>
<br></br>
<label for="Item2">Item2:</label>
<input type="text" id="item2" name="item_2"/>
<br></br>
<br></br>
<label for="Item3">Item3:</label>
<input type="text" id="item3" name="item_3"/>
<br></br>
<br></br>
<label for="Item4">Item4:</label>
<input type="text" id="item4" name="item_4"/>
</form:create>
<input id="proceed" type="submit" value="Save"/>
Upon pressing the submit button I need to make sure the first field "item1" is not empty. I haven't found a solution to this uses spring forms. Thanks in advance!

Answer 1

There are many ways to implement such validation. It is recommended you do both client and server side.
For client side you can simple create a click listener to the submit button
$('.submitbutton').click(function(e) {
e.preventDefault();
if($('#item1').val().trim() != '') $('.myform').submit()
else { $('.item1_error').show();
}
Or (even better) use 3rd party validation library
For the server side you can use hibernate-validator and add #NotEmpty annotation to your form bean
public class MyForm {
#NotEmpty private String item1;
// ...
}
Then on your controller handler method just decorate the parameter with #Valid. Any errors can be checked through the BindingResult object
#RequestMapping(..)
public String myhandler(#Valid #ModelAttribute("object") MyForm myForm, BindingResult binding) {
if(binding.hasErrors()) {
// ...
}
}