How do I javascript force paste as plain text cross browser?

Hi,

I am using TinyMCE version 4.06, I am having problems with customers pasting both HTML and other other rich text formatting junk into the TinyMCE editor. One of my customers pasted a paragraph with an opening div and no closing div. I am stripping bad formatting and characters server-side. The main issue I am having is that browsers such as IE8 don't handle malformed HTML well, so if customers paste divs that don't close or any malformed junk, TinyMCE will not display anything for them in the editor yet if you look in a modern browser you can see the content in TinyMCE.

What I want is a solution that works cross browser for forcing a client-side paste as plain text, failing that a solution that works for IE8 and above would suffice as Chrome, Firefox, Opera and Safari appear to have no problems.

My TinyMCE initialize function:

// Strips HTML and PHP tags from a string 
// returns 1: 'Kevin <b>van</b> <i>Zonneveld</i>'
// example 2: strip_tags('<p>Kevin <img src="someimage.png" onmouseover="someFunction()">van <i>Zonneveld</i></p>', '<p>');
// returns 2: '<p>Kevin van Zonneveld</p>'
// example 3: strip_tags("<a href='http://kevin.vanzonneveld.net'>Kevin van Zonneveld</a>", "<a>");
// returns 3: '<a href='http://kevin.vanzonneveld.net'>Kevin van Zonneveld</a>'
// example 4: strip_tags('1 < 5 5 > 1');
// returns 4: '1 < 5 5 > 1'
function strip_tags (str, allowed_tags)
{

    var key = '', allowed = false;
    var matches = [];    var allowed_array = [];
    var allowed_tag = '';
    var i = 0;
    var k = '';
    var html = ''; 
    var replacer = function (search, replace, str) {
        return str.split(search).join(replace);
    };
    // Build allowes tags associative array
    if (allowed_tags) {
        allowed_array = allowed_tags.match(/([a-zA-Z0-9]+)/gi);
    }
    str += '';

    // Match tags
    matches = str.match(/(<\/?[\S][^>]*>)/gi);
    // Go through all HTML tags
    for (key in matches) {
        if (isNaN(key)) {
                // IE7 Hack
            continue;
        }

        // Save HTML tag
        html = matches[key].toString();
        // Is tag not in allowed list? Remove from str!
        allowed = false;

        // Go through all allowed tags
        for (k in allowed_array) {            // Init
            allowed_tag = allowed_array[k];
            i = -1;

            if (i != 0) { i = html.toLowerCase().indexOf('<'+allowed_tag+'>');}
            if (i != 0) { i = html.toLowerCase().indexOf('<'+allowed_tag+' ');}
            if (i != 0) { i = html.toLowerCase().indexOf('</'+allowed_tag)   ;}

            // Determine
            if (i == 0) {                allowed = true;
                break;
            }
        }
        if (!allowed) {
            str = replacer(html, "", str); // Custom replace. No regexing
        }
    }
    return str;
}

tinymce.init({
	selector: 'textarea:not(.mceNoEditor)',
	toolbar: 'undo redo | bold italic | bullist numlist',
	menubar : false,
	force_br_newlines : false,
	force_p_newlines : false,
	forced_root_block : '',
	editor_deselector : "mceNoEditor",
	plugins : "paste",
	paste_use_dialog : false,
	paste_auto_cleanup_on_paste : true,
	paste_convert_headers_to_strong : false,
	paste_strip_class_attributes : "all",
	paste_remove_spans : true,
	paste_remove_styles : true,
	paste_retain_style_properties : "",
	paste_preprocess : function(pl, o) {
		//example: keep bold,italic,underline and paragraphs
		//o.content = strip_tags( o.content,'<b><u><i><p>' );

		// remove all tags => plain text
		o.content = strip_tags( o.content,'' );
	},
	paste_text_sticky : true,
	oninit: function (ed) {
        ed.pasteAsPlainText = true;
    }
});

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