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[英]Delete digits after two decimal point not round number in javascript?
[英]Decimal Validation allowing two digits after the Decimal Point on Keypress Event through Javascript
我需要限制用户在按键事件上使用纯Java小数点后两位输入数字。请帮助。
EX:123.45->更正123.45.6->不正确
function checkDec(el) {
var ex = /^[0-9]+\.?[0-9]*$/;
if (ex.test(el.value) == false) {
el.value = el.value.substring(0, el.value.length - 1);
}
}
<asp:TextBox ID="txttest0" runat="server" onkeydown="checkDec(this);" ></asp:TextBox>
我尝试过这种方式,但需要在Keypress中使用。 :(
也许您可以使用parseFloat来更正值:
<input onchange="this.value = parseFloat(this.value) || ''" type="text" />
我将其更改为onchange,因为否则它将阻止您键入。 完全没有 但是,这意味着仅当您模糊输入时,它将仅验证一次。
编辑
这样吗?
JS:
function validateFloatKeyPress(el, evt) {
var charCode = (evt.which) ? evt.which : event.keyCode;
if (charCode != 46 && charCode > 31
&& (charCode < 48 || charCode > 57)) {
return false;
}
if (charCode == 46 && el.value.indexOf(".") !== -1) {
return false;
}
return true;
}
HTML:
<input onkeypress="return validateFloatKeyPress(this, event)" type="text" />
我也遇到了同样的问题,这段代码解决了我的问题,它不仅为您的十进制数字加了密码,而且还消除了空格。 尝试此操作。在我的情况下,我允许用户输入“ +”或“-”,因此我也检查了此验证。我将此函数称为onblur事件。希望您有所帮助,
<script type="text/javascript">
function checkforvalidation() {
var txtvalue = document.getElementById('<%=txtspherical.ClientID %>').value;
var leftstr = "";
var rightstr = "";
var tempstr = "";
var operator = "";
txtvalue = txtvalue.replace(/\s/g, '');
document.getElementById('<%=txtspherical.ClientID %>').value = txtvalue;
if (txtvalue.indexOf(".") != -1) {
leftstr = txtvalue.split(".")[0];
rightstr = txtvalue.split(".")[1];
if (leftstr.indexOf("-") == 0 || leftstr.indexOf("+") == 0) {
operator = leftstr.substr(0, 1);
tempstr = leftstr.substr(1, leftstr.length - 1);
leftstr = ltrim(tempstr, '0');
if (leftstr.length == 0) {
leftstr = '0';
}
if (rightstr.indexOf("-") == -1 || rightstr.indexOf("+") == -1) {
rightstr = ltrim(rightstr, '0');
rightstr = chkdecimalpoints(rightstr);
if (operator != null || operator != "") {
txtvalue = operator + leftstr + "." + rightstr;
}
else {
txtvalue = leftstr + "." + rightstr;
}
document.getElementById('<%=txtspherical.ClientID %>').value = txtvalue;
}
else {
document.getElementById('<%=txtspherical.ClientID %>').value = "";
}
}
else {
tempstr = leftstr.substr(0, leftstr.length);
leftstr = ltrim(tempstr, '0');
if (leftstr.length == 0) {
leftstr = '0';
}
if (rightstr.indexOf("-") == -1 || rightstr.indexOf("+") == -1) {
rightstr = rtrim(rightstr, '0');
rightstr = chkdecimalpoints(rightstr);
txtvalue = leftstr + "." + rightstr;
document.getElementById('<%=txtspherical.ClientID %>').value = txtvalue;
}
}
}
else if (txtvalue.indexOf("-") == -1 || txtvalue.indexOf("+") == -1) {
txtvalue = ltrim(txtvalue, '0');
if (txtvalue.length == 0) {
txtvalue = '0';
}
if (operator != null || operator != "") {
txtvalue = operator + txtvalue + ".00";
}
// txtvalue = leftstr + "." + rightstr;
document.getElementById('<%=txtspherical.ClientID %>').value = txtvalue;
}
else if (txtvalue.indexOf("-") == 0 || txtvalue.indexOf("+") == 0) {
operator = txtvalue.substr(0, 1);
tempstr = txtvalue.substr(1, leftstr.length - 1);
txtvalue = alltrim(tempstr, '0');
if (operator != null || operator != "") {
txtvalue = operator + txtvalue + ".00";
document.getElementById('<%=txtspherical.ClientID %>').value = txtvalue;
}
}
}
function chkdecimalpoints(rightstr) {
if (rightstr.length == 0) {
rightstr = '00';
return rightstr;
}
else if (rightstr.length == 1) {
rightstr = rightstr + '0';
return rightstr;
}
else if (rightstr.length > 2) {
var tempvar = rightstr.substr(2, 1);
if (tempvar >= 5) {
tempvar = parseInt(rightstr.substr(1, 1)) + 1;
tempvar = rightstr.substr(0, 1) + tempvar.toString();
if (tempvar.length > 2) {
tempvar = tempvar.substr(0, 2);
}
return tempvar;
}
else {
tempvar = rightstr.substr(0, 2);
return tempvar;
}
}
else {
return rightstr;
}
}
function ltrim(str, chars) {
chars = chars || "\\s";
return str.replace(new RegExp("^[" + chars + "]+", "g"), "");
}
function rtrim(str, chars) {
chars = chars || "\\s";
return str.replace(new RegExp("[" + chars + "]+$", "g"), "");
}
function alltrim(str, chars) {
chars = chars || "\\s";
return str.replace(new RegExp("^[" + chars + "]+$", "g"), "");
}
</script>
HTML来源:
<asp:TextBox ID="txtspherical" runat="server" OnBlur="javascript:checkforvalidation();">
</asp:TextBox>
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