Question

i have a page with a link , when use clicks the link a new select tag will be appeared , then when the user submit the form i want to ensure that the user select an option for each select tag

you can go to the last jquery function , but i put some codes of creating the select tags

html

<div class="container" id="addCell">
    <form id="acForm"method="POST" action="<?php echo URL; ?>Cell/addCell">
        <ul>
            <li>
                <p>
                    <label>Name</label>
                    <input type="text" name="name"class="longInput1"/>
                <p>
                <p>
                    <label>City</label>
                    <select id="countrySelector" name="city">
                    </select>
                </p>
            </li>
            <li id="intersectionCells">
                <p>
                    <label>Inserted cells</label>
                    <a href="#" class="smallLink" id="acaclink">new</a>
                </p>
            </li>
            <li>
                <input type="submit" class="button1" value="save"/>
            </li>
        </ul>
    </form>
</div>

jquery

$("#addCell").ready(function(){
    $("#addCell").on('click',"#acaclink",function(){
        var me = this;
        var cityName = $("#countrySelector").val();
        $.getJSON("http://localhost/Mar7ba/Cell/getCellsInCity/"+cityName+"/TRUE",function(data){
            var options = '';
            options+="<option>Select Cell</option>";
            for(var i=0;i<data.length;i++){
                options += "<option>"+data[i]+"</option>";
            }
            $(me).closest('li').append('<p>\n\
            <label>Select Cell</label>\n\
            <select name="acSelect[]">\n\
             '+options+'\n\
</select>\n\
<a href="#" class="removeA">delete</a>\n\
<span class="errorMessage"></span>\n\
</p>');
        });
    });
});
$("#addCell").ready(function(){
    $("#addCell").on('click',".removeA",function (){
        $(this).closest('p').remove();
    });
});
$("#addCell").ready(function (){
    $("#countrySelector").change(function (){
        var cityName = $("#countrySelector").val();
        $.getJSON("http://localhost/Mar7ba/Cell/getCellsInCity/"+cityName+"/TRUE",function(data){
            var options = '';
            options+="<option>Select Cell</option>";
            for(var i=0;i<data.length;i++){
                options += "<option>"+data[i]+"</option>";
            }
            $("#intersectionCells select").html(options);
        });
    });
});

and this is the form validation

$("#addCell").ready(function (){
    $("#acForm").on('submit',function (){
        var errorCount = 0;
        $('span.errorMessage').text('');
        $('#intersectionCells select').each(function(){
            var $this = $(this);
            if($this.val() === 'Select Cell'){
                var error = 'Please select a cell' ; // take the input field from label
                $this.next('span').text(error);
                errorCount = errorCount + 1;   
            }
        });
        if(errorCount==0){
            $(this)[0].submit(); // submit form if no error
        }
    });
});

but the spam doesn’t appear as i want

Answer 1

See: http://jsfiddle.net/ujrNu/

After this

if(errorCount==0){
            $(this)[0].submit(); // submit form if no error
        }

you should add:

else{
   return false;
}

otherwise your form will get posted anyway.

The second problem is this line:

$this.next('span').text(error);

next returns the NEXT sibling, not the next sibling that is a span. If the next sibling is NOT a span, it will return null. In your case, the next sibling isn’t a span, it’s an A tag. So you want this:

$this.siblings('span :first').text(error);