I want to write some data in to clipborad from a chrome extension which I'm creating.
In the manifest file i gave permissions to both clipboardRead and clipboardWrite.

i use this function which i found here

but it doesn't work. seems that document.execCommand('copy'); can not work.

i write all of these codes in content script.

thx
manifest:

{

    manifest_version:2,



    name:easyCopy,

    description:just a small toll,

    version:1.0.0,



    permissions:[

        clipboardWrite, http://*/*, clipboardRead

    ],



    content_scripts:[

        {

            matches:[http://*/*],

            js:[jquery-1.9.1.min.js, main_feature.js]

        }

    ],



    background:{

        persistent:false,

        page:background.html

    }

}

main_feature.js:

copyOrderId();

function copyOrderId() {

    $(.order-num).click(function () {

        var curOrderNum = $(this).text();

        copyTextToClipboard(curOrderNum);

//        chrome.extension.sendMessage({method:copy, content:curOrderNum}, function (response) {

//            clog(response);

//        });

    });





}



function copyTextToClipboard(text) {

    var copyFrom = $('<textarea/>');

    copyFrom.text(text);

    $('body').append(copyFrom);

    copyFrom.select();

    document.execCommand('copy', true);

    copyFrom.remove();



}

function clog(message) {

    console.log(message);

}

the background.html is just a blank page with basic html body.