近日，我把最流行的Jquery表单验证插件jQuery.validationEngine v2.6.1应用在一个很漂亮的后台模板中，但是对jQuery.validationEngine v2.6.1的默认提示样式感到一些遗憾，因为这个提示是在input标签的右上方（默认）显示，并且仅有增加提示文字这样一种单调的效果。因为模板提供了一种很漂亮的错误提示风格，所以jQuery.validationEngine v2.6.1默认效果不太符合我的要求，我需要按照我自己的要求进行定制。但是我翻看jQuery.validationEngine v2.6.1的文档http://posabsolute.github.com/jQuery-Validation-Engine/，却没有取消Tip提示但是仍然保证跟以前一样的验证风格和流程的设置options。下面讲一下我是如何对jQuery.validationEngine v2.6.1做了一丁点改变达到目的的：
首先，我在表单页面脚本中对每个input绑定验证结果的事件“jqv.field.result”，框架会在验证后调用这个事件的处理函数。在函数中，我根据input是否通过验证errorFound来进行我自定义的DOM操作。如果有错误，我把“invalid”样式类添加到input，并且移除可能紧随input的验证正确的<span>标签，然后在input后面紧随添加一个验证错误的<span>标签；同样通过验证后，也需要进行类似操作。代码如下：
$(document).ready(function() {
$("input").bind("jqv.field.result",function(event,field,errorFound,prompText){
if(errorFound){
field.removeClass("valid");
field.addClass("invalid");
if(0<field.next(".valid-side-note").length)
field.next(".valid-side-note").remove();
if(0==field.next(".invalid-side-note").length)
field.after('<span class="invalid-side-note">'+prompText+'</span>');
}else{
field.removeClass("invalid");
field.addClass("valid");
if(0<field.next(".invalid-side-note").length)
field.next(".invalid-side-note").remove();
if(0==field.next(".valid-side-note").length)
field.after('<span class="valid-side-note"></span>');
}
errorFound==false;
//$("input").validationEngine('autoHidePrompt',true);
})
$("#form4log").validationEngine({"notShowPrompt": true});
$("#form4reg").validationEngine({"notShowPrompt": true});
})对于Hooks函数，文档中有介绍：
The plugin provides some hooks using jQuery bind functionality.
- jqv.form.validating : Trigger when the form is submitted and before it starts the validation process
- jqv.field.result(event, field, errorFound, prompText) : Triggers when a field is validated with the result.
- jqv.form.result(event, errorFound) : Triggers when a form is validated with the result
An example of binding a custom function to these events would be:
$("#formID").bind("jqv.form.result", function(event, errorFound) {
if(errorFound)
alert("There is a problem with your form");
});$("#form4log").validationEngine({"notShowPrompt": true});
$("#form4reg").validationEngine({"notShowPrompt": true});而且这个参数并不是官方文档中定义的options！对，这个是我自定义的，我对框架进行了修改，增加了一个判断是否填出调试的参数：notShowPrompt，默认为false。
(function($) {
"use strict";
var methods = {
};
$.validationEngine= {fieldIdCounter: 0,defaults:{
// Name of the event triggering field validation
validationEventTrigger: "blur",
// Automatically scroll viewport to the first error
scroll: true,
// Focus on the first input
focusFirstField:true,
// Opening box position, possible locations are: topLeft,
// topRight, bottomLeft, centerRight, bottomRight
promptPosition: "topRight",
bindMethod:"bind",
// internal, automatically set to true when it parse a _ajax rule
inlineAjax: false,
// if set to true, the form data is sent asynchronously via ajax to the form.action url (get)
ajaxFormValidation: false,
// The url to send the submit ajax validation (default to action)
ajaxFormValidationURL: false,
// HTTP method used for ajax validation
ajaxFormValidationMethod: 'get',
// Ajax form validation callback method: boolean onComplete(form, status, errors, options)
// retuns false if the form.submit event needs to be canceled.
onAjaxFormComplete: $.noop,
// called right before the ajax call, may return false to cancel
onBeforeAjaxFormValidation: $.noop,
// Stops form from submitting and execute function assiciated with it
onValidationComplete: false,
// Used when you have a form fields too close and the errors messages are on top of other disturbing viewing messages
doNotShowAllErrosOnSubmit: false,
// Object where you store custom messages to override the default error messages
custom_error_messages:{},
// true if you want to vind the input fields
binded: true,
// set to true, when the prompt arrow needs to be displayed
showArrow: true,
// did one of the validation fail ? kept global to stop further ajax validations
isError: false,
// Limit how many displayed errors a field can have
maxErrorsPerField: false,
// Caches field validation status, typically only bad status are created.
// the array is used during ajax form validation to detect issues early and prevent an expensive submit
ajaxValidCache: {},
// Auto update prompt position after window resize
autoPositionUpdate: false,
InvalidFields: [],
onFieldSuccess: false,
onFieldFailure: false,
onSuccess: false,
onFailure: false,
addSuccessCssClassToField: false,
addFailureCssClassToField: false,
// Auto-hide prompt
autoHidePrompt: false,
// Delay before auto-hide
autoHideDelay: 10000,
// Fade out duration while hiding the validations
fadeDuration: 0.3,
// Use Prettify select library
prettySelect: false,
// Add css class on prompt
addPromptClass : "",
// Custom ID uses prefix
usePrefix: "",
// Custom ID uses suffix
useSuffix: "",
// Only show one message per error prompt
showOneMessage: false,
notShowPrompt: false//!!!!!!!!自定义参数!!!!!!!!!!!!!!!
}};
$(function(){$.validationEngine.defaults.promptPosition = methods.isRTL()?'topLeft':"topRight"});
})(jQuery);
当然了，增加这样一个自定义参数是有用处的，我在框架调用提示的函数_showPrompt中使用了options.notShowPrompt，对是否提示进行了判断，代码如下：
_showPrompt: function(field, promptText, type, ajaxed, options, ajaxform) {
if(options.notShowPrompt)//如果定义notShowPrompt为true，则不进行提示，直接return
return;
var prompt = methods._getPrompt(field);
// The ajax submit errors are not see has an error in the form,
// When the form errors are returned, the engine see 2 bubbles, but those are ebing closed by the engine at the same time
// Because no error was found befor submitting
if(ajaxform) prompt = false;
if (prompt)
methods._updatePrompt(field, prompt, promptText, type, ajaxed, options);
else
methods._buildPrompt(field, promptText, type, ajaxed, options);
},