jQuery验证框架（七）注意事项 (jQuery validation)

jQuery验证框架

7、注意事项

[1]复杂的name属性值
    当使用rules选项时，若是表单的name属性值包含有非法的javascript标识符，必须将name值加上引号。

 $("#myform").validate({
   rules: {
     // no quoting necessary
     name: "required",
     // quoting necessary!
     "user[email]": "email",
     // dots need quoting, too!
     "user.address.street": "required"
   }
 });

$("#myform").validate({
  rules: {
    // no quoting necessary
    name: "required",
    // quoting necessary!
    "user[email]": "email",
    // dots need quoting, too!
    "user.address.street": "required"
  }
});

[2]重构规则
    不论何时，当你的表单中的多个字段含有相同的验证规则及验证消息，重构规则能够减小不少重复。使用 addMethod 和 addClassRules 将很是有效果。  
    假使已经重构了以下规则：

 // alias required to cRequired with new message
 $.validator.addMethod("cRequired", $.validator.methods.required,
   "Customer name required");
 // alias minlength, too
 $.validator.addMethod("cMinlength", $.validator.methods.minlength,
   // leverage parameter replacement for minlength, {0} gets replaced with 2
   $.format("Customer name must have at least {0} characters"));
 // combine them both, including the parameter for minlength
 $.validator.addClassRules("customer", { cRequired: true, cMinlength: 2 });

// alias required to cRequired with new message
$.validator.addMethod("cRequired", $.validator.methods.required,
  "Customer name required");
// alias minlength, too
$.validator.addMethod("cMinlength", $.validator.methods.minlength, 
  // leverage parameter replacement for minlength, {0} gets replaced with 2
  $.format("Customer name must have at least {0} characters"));
// combine them both, including the parameter for minlength
$.validator.addClassRules("customer", { cRequired: true, cMinlength: 2 });

    那么使用的时候以下：

 <input name="customer1" class="customer" />
 <input name="customer2" class="customer" />
 <input name="customer3" class="customer" />

<input name="customer1" class="customer" />
<input name="customer2" class="customer" />
<input name="customer3" class="customer" />

[3]验证消息
    当验证了一个无效的表单元素，验证消息显示在用户面前。这些消息是从哪里来的呢？有三个途径来取得验证消息。
        1.经过待验证表单元素的title属性
        2.经过默认的验证消息
        3.经过插件设置(messages选项)
    这三种途径的优先顺序为：3 > 1 > 2
   
[4]验证消息与Google工具栏的冲突
    有时候验证消息会与Goole工具栏的AutoFill插件冲突。AutoFill经过替换表单元素的title属性，以显示提示消息。此时，验证消息若是获取的是title属性值，那么就得不到咱们预期想要获得的结果。当文档载入时，能够经过以下方法避免冲突。

 $("input.remove_title").attr("title", "");

$("input.remove_title").attr("title", "");

[5]表单提交
    默认地，表单验证失败时阻止表单的提交，当验证经过，表单提交。固然，也能够经过submitHandler来自定义提交事件。
    将提交按钮的class属性设置成cancel，在表单提交时能够跳过验证。

 <input type="submit" name="submit" value="Submit" />
 <input type="submit" class="cancel" name="cancel" value="Cancel" />

<input type="submit" name="submit" value="Submit" />
<input type="submit" class="cancel" name="cancel" value="Cancel" />

    下面这段代码将循环提交表单：

 $("#myform").validate({
  submitHandler: function(form) {
    // some other code maybe disabling submit button
    // then:
    $(form).submit();
  }
 });

$("#myform").validate({
 submitHandler: function(form) {
   // some other code maybe disabling submit button
   // then:
   $(form).submit();
 }
});

    $(form).submit() 触发了另一轮的验证，验证后又去调用submitHandler，而后就循环了。能够用 form.submit() 来触发原生的表单提交事件。

 $("#myform").validate({
  submitHandler: function(form) {
    form.submit();
  }
 });