javascript定义的函数调用时候总是未定义

Question

 调用地方
<input type="number" required="required" class="form-control" id="width" name="advertisingPlace.width" value="${advertisingPlace.width}" onblur="isValidate()"/>
我定义的函数
<script type="text/javascript">
$(function($){
    show();

    $('#edit_form').submit(function() {
        var width = $('#width').val();
        var height = $('#height').val();
        if(width >999 || height >999){
            bootbox.alert({ 
                size: 'small',
                message: "数据不可以超过4位"
            });
            return false;
        }
        return true;
    });
});

function show(){
    var placeId = ${advertisingPlace.placeId };
    var parentId = $('#'+placeId).val();
    var id = ${advertisingPlace.placeId };
    if(parentId == placeId){
        $('#'+id).hide();
    }
}

function isValidate(){
    var width = $('#width').val();
    var height = $('#height').val();
    if(width >999 || height >999){
        bootbox.alert({ 
            size: 'small',
            message: "数据不可以超过4位"
        });
    }
}
</script>
总是提示isValidate函数未定义
Uncaught SyntaxError: Unexpected token ;
Uncaught ReferenceError: isValidate is not defined
请问各位大神，这个是怎么回事