JavaScript .indexOf array method not functioning properly in Internet Explorer versions 7 and 8

Question

JavaScript .indexOf array method not functioning properly in Internet Explorer versions 7 and 8

I'm curious to know if IE 7 and IE 8 are compatible with the JavaScript .indexOf() method because I keep getting this error message:

SCRIPT438: Object doesn't support property or method 'indexOf'

This error appears in the IE9 debug console (used under both IE7 and IE8 Browser mode).

The section of code where .indexOf() is used looks like this:

if(shirt_colour == 'black') {
    p_arr=['orange','red','green','yellow','bblue','rblue','pink','white','silver','gold'];
    if( p_arr.indexOf(print_colour) != -1 ) rtn = true;
}

javascript arrays function internet-explorer-8 internet-explorer-7

Answer 1

Answer №1

For compatibility with older versions of Internet Explorer (IE), it is recommended to add a custom implementation of the indexOf() function in your code:

if (!Array.prototype.indexOf)
{
  Array.prototype.indexOf = function(elt /*, from*/)
  {
    var len = this.length;

    var from = Number(arguments[1]) || 0;
    from = (from < 0)
         ? Math.ceil(from)
         : Math.floor(from);
    if (from < 0)
      from += len;

    for (; from < len; from++)
    {
      if (from in this &&
          this[from] === elt)
        return from;
    }
    return -1;
  };
}

This will serve as a fallback in case the original function is not adequately supported by the browser based on ECMA-262 standards.

Answer 2

For compatibility with older versions of Internet Explorer (IE), it is recommended to add a custom implementation of the indexOf() function in your code:

if (!Array.prototype.indexOf)
{
  Array.prototype.indexOf = function(elt /*, from*/)
  {
    var len = this.length;

    var from = Number(arguments[1]) || 0;
    from = (from < 0)
         ? Math.ceil(from)
         : Math.floor(from);
    if (from < 0)
      from += len;

    for (; from < len; from++)
    {
      if (from in this &&
          this[from] === elt)
        return from;
    }
    return -1;
  };
}

This will serve as a fallback in case the original function is not adequately supported by the browser based on ECMA-262 standards.

Answer 3

Answer №2

If you're looking for a function to find the index of an element in an array, this code might be useful.

function findIndex(arr, target) {
    for (let i = 0; i < arr.length; i++) {
        if (arr[i] === target) {
            return i;
        }
    }
    return -1;
}

Answer 4

If you're looking for a function to find the index of an element in an array, this code might be useful.

function findIndex(arr, target) {
    for (let i = 0; i < arr.length; i++) {
        if (arr[i] === target) {
            return i;
        }
    }
    return -1;
}

Answer 5

Answer №3

In case you require the use of indexOf in IE 8 or lower versions, it is advisable to utilize a polyfill as suggested by MDN:

// The code snippet below replicates methods from ECMA-262, Edition 5, 15.4.4.14
// For more details visit: http://es5.github.io/#x15.4.4.14
if (!Array.prototype.indexOf) {
  Array.prototype.indexOf = function(searchElement, fromIndex) {

    var k;

    // 1. Let o be the result of calling ToObject with 'this' value.
    if (this == null) {
      throw new TypeError('"this" is null or not defined');
    }

    var o = Object(this);

    // 2. Determine length based on object property.
    var len = o.length >>> 0;

    // 4. Return -1 for empty array.
    if (len === 0) {
      return -1;
    }

    // 5. Handle optional 'fromIndex' argument.
    var n = +fromIndex || 0;

    if (Math.abs(n) === Infinity) {
      n = 0;
    }

    // 6. Return -1 if exceeding length.
    if (n >= len) {
      return -1;
    }

    // 7. Manage starting index according to conditions.
    k = Math.max(n >= 0 ? n : len - Math.abs(n), 0);

    // 9. Implement search logic within the array elements.
    while (k < len) {
      if (k in o && o[k] === searchElement) {
        return k;
      }
      k++;
    }
    return -1;
  };
}

Answer 6

In case you require the use of indexOf in IE 8 or lower versions, it is advisable to utilize a polyfill as suggested by MDN:

// The code snippet below replicates methods from ECMA-262, Edition 5, 15.4.4.14
// For more details visit: http://es5.github.io/#x15.4.4.14
if (!Array.prototype.indexOf) {
  Array.prototype.indexOf = function(searchElement, fromIndex) {

    var k;

    // 1. Let o be the result of calling ToObject with 'this' value.
    if (this == null) {
      throw new TypeError('"this" is null or not defined');
    }

    var o = Object(this);

    // 2. Determine length based on object property.
    var len = o.length >>> 0;

    // 4. Return -1 for empty array.
    if (len === 0) {
      return -1;
    }

    // 5. Handle optional 'fromIndex' argument.
    var n = +fromIndex || 0;

    if (Math.abs(n) === Infinity) {
      n = 0;
    }

    // 6. Return -1 if exceeding length.
    if (n >= len) {
      return -1;
    }

    // 7. Manage starting index according to conditions.
    k = Math.max(n >= 0 ? n : len - Math.abs(n), 0);

    // 9. Implement search logic within the array elements.
    while (k < len) {
      if (k in o && o[k] === searchElement) {
        return k;
      }
      k++;
    }
    return -1;
  };
}

JavaScript .indexOf array method not functioning properly in Internet Explorer versions 7 and 8

Answer №1

Answer №2

Answer №3

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