Input box can only enter numbers, decimal point, minus sign
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function checkValue(val){
this.val=val;
}
var discountValue=new checkValue("");// Define global variables, record the last legitimate values
function clearNoNum(obj,isMinus,objValue)
{
var key = event.keyCode;
var value = obj.value;
// Defining legal press list, including a small keypad 0-9, The main keyboard area 0-9, decimal point , The negative sign, bottom, left, and right arrow keys ,home,end,delete
var mayKey =new Array(8,35,36,37,38,39,40,46,48,49,50,51,52,53,54,55,56,57,96,97,98,99,100,101,102,103,104,105,110,190);
if((key==189||key==109)&&isMinus&&objValue.val.length==0){// According to isMinus determine whether cannot enter a negative number , If we can judge the negative sign is in the first
objValue.val = value;
return false;
}
for(var i=0;i<mayKey.length;i++){
if(key==mayKey[i]){
objValue.val = value;
return false;
}
}
document.execCommand('undo');// If the keyboard is not click on the above button, clear the value of the input box
obj.value = objValue.val;// Set the global variable's value to the input box to last; a legal value assigned to an input box again
}
function discountCheck(obj){
clearNoNum(obj,false,discountValue);
}
Call page methods:
<input type="text" onkeyup="discountCheck(this)" />
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