网上的各类表单验证插件的验证规则都是写在脚本里的,但我的插件的验证规则却是写在表单元素的属性里的。如下面的例子:
注意看上面代码中以“jv“开头的各种属性名,这些都是表单验证插件需要用的属性值。其中各属性代表的意思请阅读以下表:
1、form表格控件元素可使用的属性:
属性名 | 说明 |
jvpattern | 用来验证控件值是否正确的正则表达式。(可不定义此属性) |
jvcompareid | 需要与当前控件进行值相等比较的其它控件id。(可不定义此属性) |
jvrequired | 表明当前控件值是否是必须的,也即是否允许当前控件值为空。如不定义此属性则默认为不可空,如果值为false或0则允许为空。(可不定义此属性) |
jvmethod |
定义需要进行额外验证的方法。(可不定义此属性) 此属性值如果定义,则不需要输写“括号”,并且函数原型为: xx function(item){ //代码 //true表示验证成功,false表示验证失败。 return true/false; //或者带错误消息的返回 return {result:true/false, message:'错误消息'}; } 其中item参数是当前控件对象的jQuery实例。 |
jvtipid |
显示验证提示信息的控件id。(可不定义此属性) 注:如果不定义此属性,并且未定义onerror或oncorrect函数则默认为alert提示 |
jverrortip | 当验证失败时要显示的提示信息。(可不定义此属性) |
jvcorrecttip | 当验证成功时要显示的提示信息。(可不定义此属性) |
jvfocuson | 当验证失败后是否需要将光标移到控件上。(可不定义此属性) |
控件上必须定义:jvpattern、jvmethod、jvcompareid 三者之中的一个或多个,否则插件将不对对应的控件进行验证。
2、tip提示控件元素可使用的属性:tip提示控件即是某个表单控件jvtipid指定的控件。
属性名 | 说明 |
jvnormalclass | 正常情况下显示提示信息时采用的css样式的classname。(可不定义此属性) |
jvcorrectclass | 验证成功后显示提示信息时采用的css样式的classname。(可不定义此属性) |
jverrorclass | 验证失败后显示提示信息时采用的css样式的classname。(可不定义此属性) |
After the control rules are set, you can directly activate and call jValidate to perform verification checks before the form is submitted.
Example:
or call with parameters:
blurvalidate : true,
isbubble : false,
onerror : function(item,form){
$.jMessageBox.show('error', item.attr('jverrortip') );
}
});
Please read the following table for settable parameters:
Parameter name | Description | ||||||||||||
isbubble |
Note: If the prompt information is displayed in a pop-up window, it is recommended to set this value to false to avoid too many prompts popping up at once and causing user disgust. |
||||||||||||
blurvalidate | Set whether immediate verification is required when each control loses focus. The default value is false. | ||||||||||||
emptytip | Whether to allow empty prompts. That is, when no prompt information can be displayed, whether the prompt control is still allowed to change the css class. The default value is false | ||||||||||||
oncorrect | The processing method is called when the control value is successfully verified. If it is not defined, the default behavior is adopted. Function prototype: The parameter item: represents the jQuery instance of the current control; form: represents the form instance where the control is located | ||||||||||||
onerror | The processing method is called when the control value validation fails. If it is not defined, the default behavior is adopted. Function prototype: function(item, form){ //Code } The parameter item: represents the jQuery instance of the current control; form: represents the form instance where the control is located |

The main uses of JavaScript in web development include client interaction, form verification and asynchronous communication. 1) Dynamic content update and user interaction through DOM operations; 2) Client verification is carried out before the user submits data to improve the user experience; 3) Refreshless communication with the server is achieved through AJAX technology.

Understanding how JavaScript engine works internally is important to developers because it helps write more efficient code and understand performance bottlenecks and optimization strategies. 1) The engine's workflow includes three stages: parsing, compiling and execution; 2) During the execution process, the engine will perform dynamic optimization, such as inline cache and hidden classes; 3) Best practices include avoiding global variables, optimizing loops, using const and lets, and avoiding excessive use of closures.

Python is more suitable for beginners, with a smooth learning curve and concise syntax; JavaScript is suitable for front-end development, with a steep learning curve and flexible syntax. 1. Python syntax is intuitive and suitable for data science and back-end development. 2. JavaScript is flexible and widely used in front-end and server-side programming.

Python and JavaScript have their own advantages and disadvantages in terms of community, libraries and resources. 1) The Python community is friendly and suitable for beginners, but the front-end development resources are not as rich as JavaScript. 2) Python is powerful in data science and machine learning libraries, while JavaScript is better in front-end development libraries and frameworks. 3) Both have rich learning resources, but Python is suitable for starting with official documents, while JavaScript is better with MDNWebDocs. The choice should be based on project needs and personal interests.

The shift from C/C to JavaScript requires adapting to dynamic typing, garbage collection and asynchronous programming. 1) C/C is a statically typed language that requires manual memory management, while JavaScript is dynamically typed and garbage collection is automatically processed. 2) C/C needs to be compiled into machine code, while JavaScript is an interpreted language. 3) JavaScript introduces concepts such as closures, prototype chains and Promise, which enhances flexibility and asynchronous programming capabilities.

Different JavaScript engines have different effects when parsing and executing JavaScript code, because the implementation principles and optimization strategies of each engine differ. 1. Lexical analysis: convert source code into lexical unit. 2. Grammar analysis: Generate an abstract syntax tree. 3. Optimization and compilation: Generate machine code through the JIT compiler. 4. Execute: Run the machine code. V8 engine optimizes through instant compilation and hidden class, SpiderMonkey uses a type inference system, resulting in different performance performance on the same code.

JavaScript's applications in the real world include server-side programming, mobile application development and Internet of Things control: 1. Server-side programming is realized through Node.js, suitable for high concurrent request processing. 2. Mobile application development is carried out through ReactNative and supports cross-platform deployment. 3. Used for IoT device control through Johnny-Five library, suitable for hardware interaction.

I built a functional multi-tenant SaaS application (an EdTech app) with your everyday tech tool and you can do the same. First, what’s a multi-tenant SaaS application? Multi-tenant SaaS applications let you serve multiple customers from a sing


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