Difference between revisions of "Dialog Focus: Keep it modal"

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</script>
 
</script>
 
</div>
 
</div>
 +
<h2>The Javascript</h2>
 +
<pre><code>
 +
   
 +
    var modal = document.getElementsByClassName('modal')[0];
 +
    var controls = modal.getElementsByClassName('modal-control');
 +
 +
    function modalShift(e,f,g){
 +
    //handle focus between modal elements
 +
        //e - current element
 +
        //f - next element
 +
        //g - previous element
 +
        e.onblur = function (event) {//in case user clicks out of dialog
 +
            //important that all modal controls have this class 'modal-control'
 +
            setTimeout(function () {
 +
                if (!document.activeElement.classList.contains('modal-control')) {
 +
                    event.target.focus();
 +
                }
 +
            },10);
 +
        }
 +
        e.onkeydown = function (event){
 +
            if (event.keyCode === 9) {//tab key
 +
                event.preventDefault();
 +
                if (event.shiftKey) {
 +
                    g.focus();//previuos control
 +
                } else {
 +
                    f.focus();//next control
 +
                }
 +
            }
 +
        };
 +
    }
 +
   
 +
    //middle controls
 +
    for (var i=1,j=controls.length-1;i < j; i++){
 +
        modalShift(controls[i], controls[i+1], controls[i-1]);
 +
    }
 +
    //first control
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    modalShift(controls[0], controls[1], controls[controls.length-1]);
 +
    //last control
 +
    modalShift(controls[controls.length-1], controls[0], controls[controls.length-2]);
 +
   
 +
    function closeDialog() {
 +
        modal.className = 'modal closed modal-control';
 +
        document.getElementsByClassName('modal-launcher')[0].focus();
 +
    }
 +
   
 +
    function openDialog() {
 +
        modal.className = 'modal open modal-control';
 +
        modal.setAttribute('tabindex','-1');
 +
        modal.focus();
 +
    }
 +
</code></pre>
 
</body>
 
</body>
 
</html>
 
</html>

Revision as of 20:50, 17 May 2016

Dialog Focus - Keeping focus inside modal dialogs.

Dialog Focus - Keeping focus inside modal dialogs.

While the dialog is open, focus cannot move out of the dialog.

A control before the dialog Open the dialog A control after dialog

The Javascript


    
    var modal = document.getElementsByClassName('modal')[0];
    var controls = modal.getElementsByClassName('modal-control');

    function modalShift(e,f,g){
    //handle focus between modal elements
        //e - current element
        //f - next element
        //g - previous element
        e.onblur = function (event) {//in case user clicks out of dialog
            //important that all modal controls have this class 'modal-control'
            setTimeout(function () {
                if (!document.activeElement.classList.contains('modal-control')) {
                    event.target.focus();
                }
            },10);
        }
        e.onkeydown = function (event){
            if (event.keyCode === 9) {//tab key
                event.preventDefault();
                if (event.shiftKey) {
                    g.focus();//previuos control
                } else {
                    f.focus();//next control
                }
            }
        };
    }
    
    //middle controls
    for (var i=1,j=controls.length-1;i < j; i++){
        modalShift(controls[i], controls[i+1], controls[i-1]);
    }
    //first control
    modalShift(controls[0], controls[1], controls[controls.length-1]);
    //last control
    modalShift(controls[controls.length-1], controls[0], controls[controls.length-2]);
    
    function closeDialog() {
        modal.className = 'modal closed modal-control';
        document.getElementsByClassName('modal-launcher')[0].focus();
    }
    
    function openDialog() {
        modal.className = 'modal open modal-control';
        modal.setAttribute('tabindex','-1');
        modal.focus();
    }