Error in Internet Explorer 8 - the object does not support this property or method

My ExtJS custom "treecombo" works perfectly in Firefox and Chrome, but encounters issues in Internet Explorer. Specifically, I am facing problems with IE8 when trying to run the following code:

Ext.define('MyApp.plugins.TreeCombo',
{
  extend: 'Ext.form.field.Picker',
  alias: 'widget.treecombo',
  tree: false,
  constructor: function(config)
  {
    // Code for constructor function
  },
  // More properties and methods...
});

// The issue arises on line 116:
var index = values.indexOf('' + id);

I keep receiving an error stating "Object doesn't support this property or method" at that particular line. Does anyone have any insights into how to resolve this problem?

javascriptinternet-explorer

Answer №1

One challenge with IE8 is that it lacks support for the indexOf() method in arrays. In order to work around this issue, you will need to use a polyfill solution. Check out this helpful post for an example implementation.

if (!Array.prototype.indexOf)
{
  Array.prototype.indexOf = function(elt /*, from*/)
  {
    var len = this.length >>> 0;

    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;
  };
}

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