Question

the form is still submitted. if i want to use your code and add a step.that is if show the red text then preventing the form to submit?how do i do? thank you.

Here is my script:

jQuery(function($)
{
    if (!$("#edit-name").val() || !$("#edit-email").val() || !$("#edit-comment-body").val())
    {
        $("#edit-submit").click(function()
        {
            $('#edit-name').after('<span style="color:red;">请输入你的名字</span>');
            $('#edit-mail').after('<span style="color:red;">请输入你的邮箱</span>');
            $('#edit-comment-body label span').append('<span style="color:red;">请填写内容</span>');
        });
    }
});

Answer 1

on the .click(function()) give it a parameter e

    $("#edit-submit").click(function(e)
    {
        e.preventDefault();
        $('#edit-name').after('<span style="color:red;">请输入你的名字</span>');
        $('#edit-mail').after('<span style="color:red;">请输入你的邮箱</span>');
        $('#edit-comment-body label span').append('<span style="color:red;">请填写内容</span>');
    });