How To Set A Check If Coupon Code Used One Time Then Do Not Allow To Use It Second Time In One Transection

This is my code html input field Scrip

Solution 1:

You can store it in an array and check if it exists before moving ahead.

Pseudo code below:

var couponArr = [];
var getcoupon = $("#couponadd").val();
if($.inArray(getcoupon, couponArr) !== -1) {
    alert('Coupon already used, can\'t use again.');
} else {
    couponArr.push(getcoupon);
    // your code here.. 
}

inArray returns the index of the element in the array, not a boolean indicating if the item exists in the array. If the element was not found, -1 will be returned.

Solution 2:

Add a global tag variable and set default to false，use a if condition wrap the code need to run，then in the run code set it to true.

such as：

// in outer space
var hasCodeRun = false;


// in some function
if （!hasCodeRun） {
   // run code here
   hasCodeRun = true;
}