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<a href="" id="csv-export">export</a>
<iframe id="downloadIframe" src="" style="height: 0px; width: 0px; display: none;"></iframe>
<script>
    $("#csv-export").click(function(e){
        e.preventDefault();
        oIFrm = document.getElementById('downloadIframe');
        oIFrm.src = '' // URL to download file -- via php download headers;
    });
</script>