Collection of JS form Verification control Code encyclopedia 1th/3 Page _ form effects

Keywords: JS verification form Daquan, with JS control form submission, JavaScript submission form:
Directory:
1:js string length limit, judge character length, JS limit input, limit not input, textarea length limit
2.:js Judging Chinese characters, judging whether Chinese characters, can only input Chinese characters
3:js judge whether to enter English, can only input English
4:js can only enter numbers, judge numbers, verify numbers, detect numbers, judge whether they are numbers, and enter only digits.
5: Only English characters and numbers can be entered
6:JS Email verification, JS judgment email, mailbox/mailbox format verification
7:js character filter, mask keyword
8:js Password authentication and judgment password
2.1:js is not empty, empty, or not object, judged empty, and judged not NULL
2.2: Compare the values of two table items
2.3: The form can only be numbers and "_",
2.4: Table Single input value/length limit
2.5: Chinese/English/digital/email address legality judgment
2.6: Limit the characters that a form item cannot enter
2.7 Form's self control
Universal Check function for 2.8:form text field

1. Length Limit
<script>
function test ()
{
if (DOCUMENT.A.B.VALUE.LENGTH&GT;50)
{
Alert ("Cannot exceed 50 characters!") ");
Document.a.b.focus ();
return false;
}
}
</script>
<form name=a onsubmit= "return Test ()" >
<textarea name= "B" cols= "wrap=" "VIRTUAL" rows= "6" ></textarea>
<input type= "Submit" name= "Submit" value= "Check" >
</form>

2. Can only be Chinese characters
<input onkeyup= "value="/oblog/value.replace (/[^\u4e00-\u9fa5]/g, ') ">

3. "Can only be English
<script language=javascript>
function Onlyeng ()
{
if (!) ( EVENT.KEYCODE&GT;=65&AMP;&AMP;EVENT.KEYCODE&LT;=90))
Event.returnvalue=false;
}
</script>

<input onkeydown= "Onlyeng ();" >

4. Only the numbers
<script language=javascript>
function Onlynum ()
{
if (!) ( (event.keycode>=48&&event.keycode<=57) | | (event.keycode>=96&&event.keycode<=105)))
Consider the number keys on the keypad
Event.returnvalue=false;
}
</script>

<input onkeydown= "Onlynum ();" >

5. Only English characters and numbers
<input onkeyup= "value="/oblog/value.replace (/[\w]/g, "'") "onbeforepaste=" Clipboarddata.setdata (' text ', Clipboarddata.getdata (' text '). Replace (/[^\d]/g, ') ">

6. Verify the fuel tank format
<script Language=javascript runat=server>
function Isemail (stremail) {
if (Stremail.search (-\w+) | (/^\w+) | ( \.\w+)) *\@[a-za-z0-9]+ (\.| -) [a-za-z0-9]+) *\. [a-za-z0-9]+$/)!=-1)
return true;
Else
Alert ("Oh");
}
</SCRIPT>
<input type=text onblur=isemail (this.value) >

7. Shielding keywords (here shield * * * * and * * * *)
<script language= "javascript1.2" >
function Test () {
if ((A.b.value.indexof ("* *") = = 0) | | (A.b.value.indexof ("* * *") = = 0)) {
Alert (":)");
A.b.focus ();
return false;}
}
</script>
<form name=a onsubmit= "return Test ()" >
<input Type=text name=b>
<input type= "Submit" name= "Submit" value= "Check" >
</form>

8. Two times input password is the same
<form method=post action= "" >
<input type= "Password" id= "INPUT1" >
<input type= "Password" id= "Input2" >
<input type= "button" value= "Test" onclick= "Check ()" >
</FORM>
<script>
function Check ()
{
With (document.all) {
if (Input1.value!=input2.value)
{
Alert ("false")
Input1.value = "";
Input2.value = "";
}
else Document.forms[0].submit ();
}
}
</script>
That's enough,:).
Shielding right button is cool
Oncontextmenu= ' return false ' ondragstart= ' return false ' onselectstart= ' return false '
Added to the body.


Two

2.1 Form items cannot be empty

<script language= "JavaScript" >
<!--
function Checkform ()
{
if (Document.form.name.value.length = = 0) {
Alert ("Please enter your name!");
Document.form.name.focus ();
return false;
}
return true;
}
-->
</script>

2.2 Compare the values of two table items

<script language= "JavaScript" >
<!--
function Checkform ()
if (Document.form.PWD.value!= document.form.PWD_Again.value) {
Alert ("The password you entered two times is different!") Please re-enter. ");
Document. ADDUser.PWD.focus ();
return false;
}
return true;
}
-->
</script>

2.3 Form items can only be numbers and "_" for phone/bank account verification, can be extended to domain name registration, etc.

<script language= "JavaScript" >
<!--
function Isnumber (String)
{
var letters = "1234567890-"; You can add your own input value
var i;
var C;
if (String.charat (0) = = '-')
return false;
if (String.charat (string.length-1) = = '-')
return false;
for (i = 0;  i < string.length; i + +)
{
c = String.charat (i);
if (Letters.indexof (c) < 0)
return false;
}
return true;
}
function Checkform ()
{
if (! Isnumber (Document.form.TEL.value)) {
Alert ("Your phone number is not legal!") ");
Document.form.TEL.focus ();
return false;
}
return true;
}
-->
</script>


2.4 Table Single input value/length limit

<script language= "JavaScript" >
<!--
function Checkform ()
{
if (Document.form.count.value > 100 | | Document.form.count.value < 1)
{
Alert ("The input value cannot be less than 0 or greater than 100!");
Document.form.count.focus ();
return false;
}
if (document.form.message.value.length<10)
{
Alert ("Input text is less than 10!");
Document.form.MESSAGE.focus ();
return false;
}
return true;
}
-->
</script>

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