使用JavaScript在单击按钮时显示数组元素

Question

I have an array of strings, you can see below and i want to alert each element one by one on button click:

 function mysimplefunc() {
            var i = 0;
            var array = ["a", "b", "c", "d"];
            if (array.length < 4)
            {
                var str = array[i];
                i++;
                alert(str);
            }
        }

below is asp code:

  <asp:Button ID="btn_SHow" runat="server" Text="Show Elements" OnClientClick="mysimplefunc();" />

But its not working.

Answer 1

the if loop will not working since array length is 4

and u must use for loop inorder to iterate each element..!!

for ( i=0;i<array.length;i++)
                {
                    var str = array[i];

                    alert(str);
                }

Answer 2

Try this function. This handles creating the array counter (i) as a global variable, and any number of items can be included in the array, not just four.

function mysimplefunc() {
     var array = ["a", "b", "c", "d"];
     if (typeof i == "undefined") {i = 0};
                alert(array[i++]);
     if (i == array.length) {i = 0}
}

Answer 3

function mysimplefunc() {
            var i = 0;  //declare & initialise a integer variable used for loop counter. 
            var array = ["a", "b", "c", "d"]; //Create an string array of 4 elements with name array
            var arrLength=array.length; //find the length of array elements
            for (;i<arrLength;) //iterate over the array elements upto last element
            {
                var str = array[i]; //take first element from array 
                i++; //increment the loop counter
                alert(str);//popup the small window with values present in array
            }
        }