使用输入字段从用户那里获取金额

Question

我想添加一个输入字段，该字段会自动将字符转换为$符号，当输入数字时，将返回金额。但是，我想将最小值设置为 5 美元

我的输入字段已经转换了 $ 中的字符和金额中的数字值。我只想添加 5 美元的最小值

// Jquery Dependency
$("input[data-type='currency']").on({
keyup: function() {
formatCurrency($(this));
},
blur: function() {
formatCurrency($(this), "blur");
}
});
function formatNumber(n) {
// format number 1000000 to 1,234,567
return n.replace(/D/g, "").replace(/B(?=(d{3})+(?!d))/g, ",")
}
function formatCurrency(input, blur) {
// appends $ to value, validates decimal side
// and puts cursor back in right position.
// get input value
var input_val = input.val();
// don't validate empty input
if (input_val === "") {
return;
}
// original length
var original_len = input_val.length;
// initial caret position 
var caret_pos = input.prop("selectionStart");
// check for decimal
if (input_val.indexOf(".") >= 0) {
// get position of first decimal
// this prevents multiple decimals from
// being entered
var decimal_pos = input_val.indexOf(".");
// split number by decimal point
var left_side = input_val.substring(0, decimal_pos);
var right_side = input_val.substring(decimal_pos);
// add commas to left side of number
left_side = formatNumber(left_side);
// validate right side
right_side = formatNumber(right_side);
// On blur make sure 2 numbers after decimal
if (blur === "blur") {
right_side += "00";
}
// Limit decimal to only 2 digits
right_side = right_side.substring(0, 2);
// join number by .
input_val = "$" + left_side + "." + right_side;
} else {
// no decimal entered
// add commas to number
// remove all non-digits
input_val = formatNumber(input_val);
input_val = "$" + input_val;
// final formatting
if (blur === "blur") {
input_val += ".00";
}
}
// send updated string to input
input.val(input_val);
// put caret back in the right position
var updated_len = input_val.length;
caret_pos = updated_len - original_len + caret_pos;
input[0].setSelectionRange(caret_pos, caret_pos);
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<input type="text" name="currency-field" id="currency-field" pattern="^$d{1,3}(,d{3})*(.d+)?$" value="" data-type="currency" placeholder="$1,000,000.00" autocomplete ="off">

Answer 1

试试这个

// Jquery Dependency
$("input[data-type='currency']").on({
keyup: function() {
formatCurrency($(this));
},
blur: function() {
var val = this.value.trim();
val = val.substring(1);
if (!isNaN(val) && +val <5) this.value=5;
console.log(val)
formatCurrency($(this), "blur");
}
});
function formatNumber(n) {
// format number 1000000 to 1,234,567
return n.replace(/D/g, "").replace(/B(?=(d{3})+(?!d))/g, ",")
}
function formatCurrency(input, blur) {
// appends $ to value, validates decimal side
// and puts cursor back in right position.
// get input value
var input_val = input.val();
// don't validate empty input
if (input_val === "") {
return;
}
// original length
var original_len = input_val.length;
// initial caret position 
var caret_pos = input.prop("selectionStart");
// check for decimal
if (input_val.indexOf(".") >= 0) {
// get position of first decimal
// this prevents multiple decimals from
// being entered
var decimal_pos = input_val.indexOf(".");
// split number by decimal point
var left_side = input_val.substring(0, decimal_pos);
var right_side = input_val.substring(decimal_pos);
// add commas to left side of number
left_side = formatNumber(left_side);
// validate right side
right_side = formatNumber(right_side);
// On blur make sure 2 numbers after decimal
if (blur === "blur") {
right_side += "00";
}
// Limit decimal to only 2 digits
right_side = right_side.substring(0, 2);
// join number by .
input_val = "$" + left_side + "." + right_side;
} else {
// no decimal entered
// add commas to number
// remove all non-digits
input_val = formatNumber(input_val);
input_val = "$" + input_val;
// final formatting
if (blur === "blur") {
input_val += ".00";
}
}
// send updated string to input
input.val(input_val);
// put caret back in the right position
var updated_len = input_val.length;
caret_pos = updated_len - original_len + caret_pos;
input[0].setSelectionRange(caret_pos, caret_pos);
}

.error { border: 3px solid red; }

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<input type="text" name="currency-field" id="currency-field" pattern="^$d{1,3}(,d{3})*(.d+)?$" value="" data-type="currency" placeholder="$1,000,000.00" autocomplete="off" />