


But the strange thing is that it feels a bit weird when I use it recently, because it seems a bit rigid, the adaptability of existing functions is not strong enough, and there is even a strange bug. It is normal for any project to have bugs, but this bug is actually a function that has been recorded in the document but has not been implemented, which is a bit unreasonable. This problem lies in the remote verification method. Fortunately, it is very easy to modify. I will record it here for future reference.
During form verification, sometimes it is necessary to send an AJAX request to the server for judgment, such as checking whether the user name exists when the user registers. The jQuery Validation plugin provides a remote way to achieve this. For example, I can validate the form like this:
In this way, jQuery Validation will request a URL such as "/account/verify?userName=jeffz" to obtain true/false. Unfortunately, when we use ASP.NET MVC, we often write the input name in a specific form in order to take advantage of the powerful binding function of DefaultModelBinder. For example:
At the same time, the parameter name of the Action method we use for verification may also be different:
public ActionResult Verify(string name) { ... }
According to the document description, at this time we should write like this:
$('#regForm').validate({
'rules': {
'user.Name': {
'remote': {
url: '/account/verify',
data: {
name: function( ) { return $("#userName").val(); }
}}}}});
However, from the actual effect, jQuery is still requesting "/account /verify?user.Name=jeffz", I am puzzled. After three confirmations, I had to turn to the jquery.validation.js source code. I almost fainted after reading it:
remote: function(value, element, param) {
if ( this.optional(element) )
return "dependency-mismatch";
...
param = typeof param == "string" && {url:param} || param;
if ( previous.old !== value ) {
previous.old = value;
var validator = this;
this.startRequest(element);
var data = {};
data[element.name] = value; // data should still be based on element.name?
$.ajax($.extend(true, {
url: param,
mode: "abort",
port: "validate" element.name,
dataType: "json" ,
data: data,
success: function(response) {
...
I am very strange, I don’t know why this is done, this does not have the specified effect at all The role of the parameter name. Then, change it:
remote: function(value, element, param) {
if (this.optional(element))
return "dependency-mismatch";
...
param = typeof param == "string" && {url:param} || param;
if (previous.old !== value) {
previous.old = value;
var validator = this;
this.startRequest(element);
var data = {};
data[element.name] = value;
$.ajax($.extend(true, {
// url: param,
url: param .url,
mode: "abort",
port: "validate" element.name,
dataType: "json",
// data: data,
data: param.data || data,
success: function(response) {
...
Just modify two places and the problem will be solved. Unfortunately, jquery.validate.min.js is similar. The files can only be compressed by myself.
It is really puzzling that such a problem occurs.

实现方法:1、用“$("img").delay(毫秒数).fadeOut()”语句,delay()设置延迟秒数;2、用“setTimeout(function(){ $("img").hide(); },毫秒值);”语句,通过定时器来延迟。

区别:1、axios是一个异步请求框架,用于封装底层的XMLHttpRequest,而jquery是一个JavaScript库,只是顺便封装了dom操作;2、axios是基于承诺对象的,可以用承诺对象中的方法,而jquery不基于承诺对象。

修改方法:1、用css()设置新样式,语法“$(元素).css("min-height","新值")”;2、用attr(),通过设置style属性来添加新样式,语法“$(元素).attr("style","min-height:新值")”。

增加元素的方法:1、用append(),语法“$("body").append(新元素)”,可向body内部的末尾处增加元素;2、用prepend(),语法“$("body").prepend(新元素)”,可向body内部的开始处增加元素。

删除方法:1、用empty(),语法“$("div").empty();”,可删除所有子节点和内容;2、用children()和remove(),语法“$("div").children().remove();”,只删除子元素,不删除内容。

在jquery中,apply()方法用于改变this指向,使用另一个对象替换当前对象,是应用某一对象的一个方法,语法为“apply(thisobj,[argarray])”;参数argarray表示的是以数组的形式进行传递。

on()方法有4个参数:1、第一个参数不可省略,规定要从被选元素添加的一个或多个事件或命名空间;2、第二个参数可省略,规定元素的事件处理程序;3、第三个参数可省略,规定传递到函数的额外数据;4、第四个参数可省略,规定当事件发生时运行的函数。

去掉方法:1、用“$(selector).removeAttr("readonly")”语句删除readonly属性;2、用“$(selector).attr("readonly",false)”将readonly属性的值设置为false。


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