Error message 'Object doesn't have support for this property or method' is triggered by a basic JSON object

Question

Error message 'Object doesn't have support for this property or method' is triggered by a basic JSON object

Recently, I developed a compact framework for loading resources asynchronously (hyperlink). The framework functions properly in modern browsers such as Opera, Chrome, and Firefox.

However, when testing it in IE8, the code fails to execute. Internet Explorer displays an error message stating "Object doesn't support this property or method" related to a basic JSON object that has been verified using eval().

I am seeking guidance on resolving this issue. What could potentially be causing this error in IE8?

javascript json internet-explorer-8

Answer 1

Answer №1

It's likely that the error is being triggered because Internet Explorer 8 does not support the .indexOf() method.

Here is a reference on this issue:

The indexOf method was introduced in the ECMA-262 standard in the 5th edition, which means it may not be available in all browsers. To overcome this limitation, you can use the following polyfill code at the beginning of your scripts. This code allows you to use indexOf even when native support is lacking. The algorithm follows the specifications outlined in ECMA-262, 5th edition, under the assumptions that TypeError and Math.abs have their original definitions.

To implement the polyfill code:

if (!Array.prototype.indexOf) {
  Array.prototype.indexOf = function (searchElement /*, fromIndex */ ) {
    "use strict";
    if (this == null) {
      throw new TypeError();
    }
    var t = Object(this);
    var len = t.length >>> 0;

    if (len === 0) {
      return -1;
    }
    var n = 0;
    if (arguments.length > 1) {
      n = Number(arguments[1]);
      if (n != n) { // shortcut for verifying if it's NaN
        n = 0;
      } else if (n != 0 && n != Infinity && n != -Infinity) {
        n = (n > 0 || -1) * Math.floor(Math.abs(n));
      }
    }
    if (n >= len) {
      return -1;
    }
    var k = n >= 0 ? n : Math.max(len - Math.abs(n), 0);
    for (; k < len; k++) {
      if (k in t && t[k] === searchElement) {
        return k;
      }
    }
    return -1;
  }
}

Answer 2

It's likely that the error is being triggered because Internet Explorer 8 does not support the .indexOf() method.

Here is a reference on this issue:

The indexOf method was introduced in the ECMA-262 standard in the 5th edition, which means it may not be available in all browsers. To overcome this limitation, you can use the following polyfill code at the beginning of your scripts. This code allows you to use indexOf even when native support is lacking. The algorithm follows the specifications outlined in ECMA-262, 5th edition, under the assumptions that TypeError and Math.abs have their original definitions.

To implement the polyfill code:

if (!Array.prototype.indexOf) {
  Array.prototype.indexOf = function (searchElement /*, fromIndex */ ) {
    "use strict";
    if (this == null) {
      throw new TypeError();
    }
    var t = Object(this);
    var len = t.length >>> 0;

    if (len === 0) {
      return -1;
    }
    var n = 0;
    if (arguments.length > 1) {
      n = Number(arguments[1]);
      if (n != n) { // shortcut for verifying if it's NaN
        n = 0;
      } else if (n != 0 && n != Infinity && n != -Infinity) {
        n = (n > 0 || -1) * Math.floor(Math.abs(n));
      }
    }
    if (n >= len) {
      return -1;
    }
    var k = n >= 0 ? n : Math.max(len - Math.abs(n), 0);
    for (; k < len; k++) {
      if (k in t && t[k] === searchElement) {
        return k;
      }
    }
    return -1;
  }
}

Answer 3

Answer №2

Internet Explorer 8 does not support Array.indexOf functionality. One workaround is to add it to the Array prototype as suggested by Irvin Dominin also known as Edward. However, this approach may lead to issues when iterating arrays using for (x in array) loops without using array.hasOwnProperty(x).

An alternative could be utilizing the underscorejs contains function like so:

_.contains(resourceType[t].type, src.substr(src.lastIndexOf('.')+1))

If you are working on a file loading framework and prefer not to rely on third-party libraries, avoid polyfilling Array with indexOf or using external solutions like underscore's _.contains function. Instead, consider creating a simple custom function that searches for a value within an index:

function arrayContains(array, element) {
    var i;
    for (i=0; i<array.length; i++) {
        if (array[i] === element) {
            return true;
        }
    }
    return false;
}

Answer 4

Internet Explorer 8 does not support Array.indexOf functionality. One workaround is to add it to the Array prototype as suggested by Irvin Dominin also known as Edward. However, this approach may lead to issues when iterating arrays using for (x in array) loops without using array.hasOwnProperty(x).

An alternative could be utilizing the underscorejs contains function like so:

_.contains(resourceType[t].type, src.substr(src.lastIndexOf('.')+1))

If you are working on a file loading framework and prefer not to rely on third-party libraries, avoid polyfilling Array with indexOf or using external solutions like underscore's _.contains function. Instead, consider creating a simple custom function that searches for a value within an index:

function arrayContains(array, element) {
    var i;
    for (i=0; i<array.length; i++) {
        if (array[i] === element) {
            return true;
        }
    }
    return false;
}

Error message 'Object doesn't have support for this property or method' is triggered by a basic JSON object

Answer №1

Answer №2

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