Collection of js form validation control codes_form special effects
Keywords: js verification form collection, use JS to control form submission, javascript submission form:
Directory:
1: js string length limit, determine character length, js limit input, limit input, textarea Length limit
2.: js determines Chinese characters, determines whether they are Chinese characters, and can only input Chinese characters
3: js determines whether to enter English, and can only enter English
4: js can only input numbers, determine numbers, and verify Numbers, detect numbers, determine whether they are numbers, only numbers can be entered
5: Only English characters and numbers can be entered
6: js email verification, js judge email, mailbox/email format verification
7:js Character filtering, keyword blocking
8: js password verification, password judgment
2.1: js is not empty, is empty or not an object, is judged to be empty, is judged not to be empty
2.2: compares two tables Whether the values of individual items are the same
2.3: The form can only be numbers and "_",
2.4: Form item input value/length limit
2.5: Chinese/English/number/email address legality judgment
2.6: Limit the characters that cannot be entered in form items
2.7 Self-character control of form
2.8: Universal verification function of form text field
1. Length limit
<script> <br>function test() <br>{ <br>if(document.a.b.value.length>50) <br>{ <br>alert("Cannot exceed 50 characters!"); <br>document.a.b.focus (); <br>return false; <br>} <br>} <br></script>
2. Can only be Chinese characters
3." It can only be in English
4. Can only be numbers
7. Block keywords (*** and **** are blocked here)
8. Are the passwords entered twice the same?
{
with(document.all){
if(input1.value!=input2.value)
{
alert("false")
input1.value = "";
input2.value = "";
}
else document.forms[0].submit();
}
}
< ;/script>
That’s enough :)
Blocking the right click is cool
oncontextmenu="return false" ondragstart="return false" onselectstart="return false"
Add to body
2
2.1 Form items cannot be empty
2.2 Compare whether the values of two form items are the same
2.6 Characters that cannot be entered in limited form items
1. Check whether a string consists entirely of numbers
------------- ------------------------ ) {RETURN Str.Match (/D/) == NULL}
Alert (Checknum ("1232142141")
Alert (Checknum ("123214214a1")
//-& lt; & lt; & lt; & lt; & lt; & lt; & lt; & lt; & lt; /script>
2. How to judge whether it is a character
-------------------------------- --------
if (/[^x00-xff]/g.test(s)) alert("Contains Chinese characters");
else alert("All characters");
3. How to judge whether it contains Chinese characters ----
4. Email format verification
---------------------------------------------
//Function name: chkemail
//Function introduction: Check whether it is an Email Address
//Parameter description: String to be checked
//Return value: 0: No 1: Yes
function chkemail(a)
{ var i=a.length;
var temp = a.indexOf('@');
var tempd = a.indexOf('.'); 0){
return 1;
}
}
return 0; >-- ---------------------------------------------
//Function name: fucCheckNUM
/ /Function introduction: Check whether it is a number
//Parameter description: The number to be checked
//Return value: 1 means it is a number, 0 means it is not a number
function fucCheckNUM(NUM)
{
var i,j,strTemp;
strTemp="0123456789";
if (NUM.length== 0)
return 0
for (i=0;i
//Function name: fucCheckTEL
//Function introduction ：Check whether it is a phone number >var i,j,strTemp;
strTemp="0123456789-()# ";
for (i=0;i
function ischinese(s){
var ret=true;
for(var i=0;i< ;s.length;i )
ret=ret && (s.charCodeAt(i)>=10000);
return ret;
}
8. Comprehensive judgment of user input The legality function of
---------------------------------------------
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
What should I do if I encounter garbled code printing for front-end thermal paper receipts?
Apr 04, 2025 pm 02:42 PM
Frequently Asked Questions and Solutions for Front-end Thermal Paper Ticket Printing In Front-end Development, Ticket Printing is a common requirement. However, many developers are implementing...
Demystifying JavaScript: What It Does and Why It Matters
Apr 09, 2025 am 12:07 AM
JavaScript is the cornerstone of modern web development, and its main functions include event-driven programming, dynamic content generation and asynchronous programming. 1) Event-driven programming allows web pages to change dynamically according to user operations. 2) Dynamic content generation allows page content to be adjusted according to conditions. 3) Asynchronous programming ensures that the user interface is not blocked. JavaScript is widely used in web interaction, single-page application and server-side development, greatly improving the flexibility of user experience and cross-platform development.
Who gets paid more Python or JavaScript?
Apr 04, 2025 am 12:09 AM
There is no absolute salary for Python and JavaScript developers, depending on skills and industry needs. 1. Python may be paid more in data science and machine learning. 2. JavaScript has great demand in front-end and full-stack development, and its salary is also considerable. 3. Influencing factors include experience, geographical location, company size and specific skills.
How to merge array elements with the same ID into one object using JavaScript?
Apr 04, 2025 pm 05:09 PM
How to merge array elements with the same ID into one object in JavaScript? When processing data, we often encounter the need to have the same ID...
Is JavaScript hard to learn?
Apr 03, 2025 am 12:20 AM
Learning JavaScript is not difficult, but it is challenging. 1) Understand basic concepts such as variables, data types, functions, etc. 2) Master asynchronous programming and implement it through event loops. 3) Use DOM operations and Promise to handle asynchronous requests. 4) Avoid common mistakes and use debugging techniques. 5) Optimize performance and follow best practices.
How to achieve parallax scrolling and element animation effects, like Shiseido's official website?
or:
How can we achieve the animation effect accompanied by page scrolling like Shiseido's official website?
Apr 04, 2025 pm 05:36 PM
Discussion on the realization of parallax scrolling and element animation effects in this article will explore how to achieve similar to Shiseido official website (https://www.shiseido.co.jp/sb/wonderland/)...
The Evolution of JavaScript: Current Trends and Future Prospects
Apr 10, 2025 am 09:33 AM
The latest trends in JavaScript include the rise of TypeScript, the popularity of modern frameworks and libraries, and the application of WebAssembly. Future prospects cover more powerful type systems, the development of server-side JavaScript, the expansion of artificial intelligence and machine learning, and the potential of IoT and edge computing.
The difference in console.log output result: Why are the two calls different?
Apr 04, 2025 pm 05:12 PM
In-depth discussion of the root causes of the difference in console.log output. This article will analyze the differences in the output results of console.log function in a piece of code and explain the reasons behind it. �...
