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JS Implementation of text box support add and subtract operation method

Source: Internet
Author: User
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<! DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 transitional//en"
"Http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" >
<title> text boxes that support add and subtract operations </title>
<meta http-equiv= "Content-type" content= "text/html;charset=gb2312" >
<style type= "Text/css" >
Body{color: #000; Font-size:14px;font-family:verdana,arial,helvetica,sans-serif, "Song Body";}
Input{border-style:solid;border-color: #868275; Background-color: #f9f9f9; Border-width:1px;color: #505050; Vertical-align:middle;}
</style>
<script language=javascript>
function Floatadd (ARG1,ARG2) {
var r1,r2,m;
Try{r1=arg1.tostring (). Split (".") [1].length}catch (e) {r1=0}
Try{r2=arg2.tostring (). Split (".") [1].length}catch (e) {r2=0}
M=math.pow (10,math.max (R1,R2))
Return (arg1*m+arg2*m)/M
}
function Floatsubtr (ARG1,ARG2) {
Return Floatadd (ARG1,-ARG2);
}
function Ismoney (Money) {
if (/^[\d|+|.| -]+$/.test (Money)) return true;
return false;
}
function result () {
Str=document.getelementbyid ("buy"). Value;
if (! ( Ismoney (str))) {
document.getElementById ("Amount"). InnerHTML = "Invalid Amount";
return false;
}
var len=str.length,money=0,num=0;
var numstr= "", ctrlflag= "X", cflag=0;
for (var i=0;i<len; i++) {
c= Str.charat (i);
if ((c== "+") | | (c== "-")) {
if (I+1<len) {
if ((Str.charat (i+1) = = "+") | | (Str.charat (i+1) = = "-")) Continue
}
if ((numstr!= ") && (IsNaN (NUMSTR))) {
if (IsNaN (NUMSTR)) {
document.getElementById ("Amount"). InnerHTML = "Invalid amount entered";
return false;
}
}
if (numstr!= "") {
Alert ("I:" +i+ "NUMSTR:" +numstr);
if ((ctrlflag== "+") | | (ctrlflag== "x")) {
Num=parsefloat (NUMSTR);
Alert (ctrlflag+ "Money:" +money+ "Num:" +num);
Money=floatadd (Money,num);
Numstr= "";
num=0;
Ctrlflag=c;
}
else{
Alert (money+ "inside minus" +numstr);
Num=parsefloat (NUMSTR);
MONEY=FLOATSUBTR (Money,num);
Numstr= "";
num=0;
Ctrlflag=c;
}
}
else{
Ctrlflag=c;
}
Continue
}
else{
numstr=numstr+ "" +C;
}
}
if ((numstr!= ") && (IsNaN (NUMSTR))) {
if (IsNaN (NUMSTR)) {
document.getElementById ("Amount"). InnerHTML = "Invalid Amount" +NUMSTR;
return false;
}
}
if ((ctrlflag== "-") && (numstr!= "")) {
Num=parsefloat (NUMSTR);
MONEY=FLOATSUBTR (Money,num);
}
if ((ctrlflag== "+") | | (ctrlflag== "x")) && ((numstr!= ""))) {
Num=parsefloat (NUMSTR);
Money=floatadd (Money,num);
}
document.getElementById ("Amount"). InnerHTML =money;
}
</script>
<body>
Please enter add and subtract formula: <input id= "buy" name= "buy" maxlength= "" type= "text" onkeyup= "Javascript:result ();" >
<span id= "Amount" ></span>
</body>

<! DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 transitional//en"
"Http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" >
<title> text boxes that support add and subtract operations </title>
<meta http-equiv= "Content-type" content= "text/html;charset=gb2312" >
<style type= "Text/css" >
Body{color: #000; Font-size:14px;font-family:verdana,arial,helvetica,sans-serif, "Song Body";}
Input{border-style:solid;border-color: #868275; Background-color: #f9f9f9; Border-width:1px;color: #505050; Vertical-align:middle;}
</style>
<script language=javascript>
function Floatadd (ARG1,ARG2) {
var r1,r2,m;
Try{r1=arg1.tostring (). Split (".") [1].length}catch (e) {r1=0}
Try{r2=arg2.tostring (). Split (".") [1].length}catch (e) {r2=0}
M=math.pow (10,math.max (R1,R2))
Return (arg1*m+arg2*m)/M
}
function Floatsubtr (ARG1,ARG2) {
Return Floatadd (ARG1,-ARG2);
}
function Ismoney (Money) {
if (/^[\d|+|.| -]+$/.test (Money)) return true;
return false;
}
function result () {
Str=document.getelementbyid ("buy"). Value;
if (! ( Ismoney (str))) {
document.getElementById ("Amount"). InnerHTML = "Invalid Amount";
return false;
}
var len=str.length,money=0,num=0;
var numstr= "", ctrlflag= "X", cflag=0;
for (var i=0;i<len; i++) {
c= Str.charat (i);
if ((c== "+") | | (c== "-")) {
if (I+1<len) {
if ((Str.charat (i+1) = = "+") | | (Str.charat (i+1) = = "-")) Continue
}
if ((numstr!= ") && (IsNaN (NUMSTR))) {
if (IsNaN (NUMSTR)) {
document.getElementById ("Amount"). InnerHTML = "Invalid amount entered";
return false;
}
}
if (numstr!= "") {
Alert ("I:" +i+ "NUMSTR:" +numstr);
if ((ctrlflag== "+") | | (ctrlflag== "x")) {
Num=parsefloat (NUMSTR);
Alert (ctrlflag+ "Money:" +money+ "Num:" +num);
Money=floatadd (Money,num);
Numstr= "";
num=0;
Ctrlflag=c;
}
else{
Alert (money+ "inside minus" +numstr);
Num=parsefloat (NUMSTR);
MONEY=FLOATSUBTR (Money,num);
Numstr= "";
num=0;
Ctrlflag=c;
}
}
else{
Ctrlflag=c;
}
Continue
}
else{
numstr=numstr+ "" +C;
}
}
if ((numstr!= ") && (IsNaN (NUMSTR))) {
if (IsNaN (NUMSTR)) {
document.getElementById ("Amount"). InnerHTML = "Invalid Amount" +NUMSTR;
return false;
}
}
if ((ctrlflag== "-") && (numstr!= "")) {
Num=parsefloat (NUMSTR);
MONEY=FLOATSUBTR (Money,num);
}
if ((ctrlflag== "+") | | (ctrlflag== "x")) && ((numstr!= ""))) {
Num=parsefloat (NUMSTR);
Money=floatadd (Money,num);
}
document.getElementById ("Amount"). InnerHTML =money;
}
</script>
<body>
Please enter add and subtract formula: <input id= "buy" name= "buy" maxlength= "" type= "text" onkeyup= "Javascript:result ();" >
<span id= "Amount" ></span>
</body>

JS Implementation of text box support add and subtract operation method

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

Related Keywords:
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