content_script_all_frames.js

//attach event listener from popup
chrome.extension.onMessage.addListener(function (request, sender, sendResponse) {
    if (request.method == "runFunction")
        runFunction(request.myVars);
    else if (request.snippet) {
        insertTextAtCursor(request.snippet);
    }

});


var s = document.createElement('script');
s.src = chrome.extension.getURL('inject.js');
s.onload = function() {
    this.remove();
};
(document.head || document.documentElement).appendChild(s);



function runFunction(f) {
    var doc;
    if (jQuery('#gsft_main').length)
        doc = jQuery('#gsft_main')[0].contentWindow.document;
    else
        doc = document;
    
    var script = doc.createElement('script');
    script.appendChild(doc.createTextNode(f));
    doc.body.appendChild(script);

}


function insertTextAtCursor(text) {
    var el = document.activeElement;
    var val = el.value;
    var endIndex;
    var range;
    var doc = el.ownerDocument;
    if (typeof el.selectionStart === 'number' &&
        typeof el.selectionEnd === 'number') {
        endIndex = el.selectionEnd;
        el.value = val.slice(0, endIndex) + text + val.slice(endIndex);
        el.selectionStart = el.selectionEnd = endIndex + text.length;
    } else if (doc.selection !== 'undefined' && doc.selection.createRange) {
        el.focus();
        range = doc.selection.createRange();
        range.collapse(false);
        range.text = text;
        range.select();
    }
}