as a question, I now have 4 input,4 input, all of which can only enter digits and decimal places from the beginning of the input, and can only enter 4 decimal places after the decimal point. If the input format is incorrect, for example, if I write an s into it, the s cannot be written into it. If you want to use the key event, how to solve it and find a solution
regular verification is fine
/^(-?\d+)(\.\d{4})?$/<input id="input">
var input = document.getElementById('input');
var reg = /^\d+(\.)?\d{0,4}?$/;
var oldValue = ''
input.addEventListener('input',function(e){
if(reg.test(e.target.value)){
oldValue = e.target.value
}else if(e.target.value){
e.target.value = oldValue;
} else{
e.target.value = '';
oldValue = '';
}
});
input.addEventListener('change',function(e){
if(e.target.value.endsWith('.')){
e.target.value = e.target.value.slice(0,-1);
}
});<input type="text" onkeyup="clearNoNum(this)">
function clearNoNum(obj){
obj.value = obj.value.replace(/[^\d.]/g,""); //"""."
obj.value = obj.value.replace(/^\./g,""); //
obj.value = obj.value.replace(/\.{2,}/g,"."); //.
obj.value = obj.value.replace(".","$-sharp$").replace(/\./g,"").replace("$-sharp$",".");
obj.value = obj.value.replace(/^(\-)*(\d+)\.(\d\d\d\d\d\d).*$/,'$1$2.$3'); //
$('input[name="buyMoney"]').val(accMul($('input[name="buyPrice"]').val(),$('input[name="buyVal"]').val()));
$('input[name="saleMoney"]').val(accMul($('input[name="salePrice"]').val(),$('input[name="saleVal"]').val()));
}
//
function accMul(arg1,arg2){
{
if(arg1 == undefined || arg2 == undefined){
return
}
var m=0,s1=arg1.toString(),s2=arg2.toString();
try{m+=s1.split(".")[1].length}catch(e){}
try{m+=s2.split(".")[1].length}catch(e){}
return Number(s1.replace(".",""))*Number(s2.replace(".",""))/Math.pow(10,m)
}
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