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minimalj.0.10.5.0.source-code.dialog-polyfill.js Maven / Gradle / Ivy
A java framework aiming for a minimal programming style. Includes GUI and persistence layer.
(function() {
var supportCustomEvent = window.CustomEvent;
if (!supportCustomEvent || typeof supportCustomEvent == 'object') {
supportCustomEvent = function CustomEvent(event, x) {
x = x || {};
var ev = document.createEvent('CustomEvent');
ev.initCustomEvent(event, !!x.bubbles, !!x.cancelable, x.detail || null);
return ev;
};
supportCustomEvent.prototype = window.Event.prototype;
}
/**
* Finds the nearest from the passed element.
*
* @param {Element} el to search from
* @return {HTMLDialogElement} dialog found
*/
function findNearestDialog(el) {
while (el) {
if (el.nodeName.toUpperCase() == 'DIALOG') {
return /** @type {HTMLDialogElement} */ (el);
}
el = el.parentElement;
}
return null;
}
/**
* @param {!NodeList} nodeList to search
* @param {Node} node to find
* @return {boolean} whether node is inside nodeList
*/
function inNodeList(nodeList, node) {
for (var i = 0; i < nodeList.length; ++i) {
if (nodeList[i] == node) {
return true;
}
}
return false;
}
/**
* @param {!HTMLDialogElement} dialog to upgrade
* @constructor
*/
function dialogPolyfillInfo(dialog) {
this.dialog_ = dialog;
this.replacedStyleTop_ = false;
this.openAsModal_ = false;
dialog.show = this.show.bind(this);
dialog.showModal = this.showModal.bind(this);
dialog.close = this.close.bind(this);
if (!('returnValue' in dialog)) {
dialog.returnValue = '';
}
this.maybeHideModal = this.maybeHideModal.bind(this);
if ('MutationObserver' in window) {
// IE11+, most other browsers.
var mo = new MutationObserver(this.maybeHideModal);
mo.observe(dialog, { attributes: true, attributeFilter: ['open'] });
} else {
dialog.addEventListener('DOMAttrModified', this.maybeHideModal);
}
// Note that the DOM is observed inside DialogManager while any dialog
// is being displayed as a modal, to catch modal removal from the DOM.
Object.defineProperty(dialog, 'open', {
set: this.setOpen.bind(this),
get: dialog.hasAttribute.bind(dialog, 'open')
});
this.backdrop_ = document.createElement('div');
this.backdrop_.className = 'backdrop';
this.backdropClick_ = this.backdropClick_.bind(this);
}
dialogPolyfillInfo.prototype = {
get dialog() {
return this.dialog_;
},
/**
* Maybe remove this dialog from the modal top layer. This is called when
* a modal dialog may no longer be tenable, e.g., when the dialog is no
* longer open or is no longer part of the DOM.
*/
maybeHideModal: function() {
if (!this.openAsModal_) { return; }
if (this.dialog_.hasAttribute('open') &&
document.body.contains(this.dialog_)) { return; }
this.openAsModal_ = false;
this.dialog_.style.zIndex = '';
// This won't match the native exactly because if the user set
// top on a centered polyfill dialog, that top gets thrown away when the
// dialog is closed. Not sure it's possible to polyfill this perfectly.
if (this.replacedStyleTop_) {
this.dialog_.style.top = '';
this.replacedStyleTop_ = false;
}
// Optimistically clear the modal part of this .
this.backdrop_.removeEventListener('click', this.backdropClick_);
if (this.backdrop_.parentElement) {
this.backdrop_.parentElement.removeChild(this.backdrop_);
}
dialogPolyfill.dm.removeDialog(this);
},
/**
* @param {boolean} value whether to open or close this dialog
*/
setOpen: function(value) {
if (value) {
this.dialog_.hasAttribute('open') || this.dialog_.setAttribute('open', '');
} else {
this.dialog_.removeAttribute('open');
this.maybeHideModal(); // nb. redundant with MutationObserver
}
},
/**
* Handles clicks on the fake .backdrop element, redirecting them as if
* they were on the dialog itself.
*
* @param {!Event} e to redirect
*/
backdropClick_: function(e) {
var redirectedEvent = document.createEvent('MouseEvents');
redirectedEvent.initMouseEvent(e.type, e.bubbles, e.cancelable, window,
e.detail, e.screenX, e.screenY, e.clientX, e.clientY, e.ctrlKey,
e.altKey, e.shiftKey, e.metaKey, e.button, e.relatedTarget);
this.dialog_.dispatchEvent(redirectedEvent);
e.stopPropagation();
},
/**
* Sets the zIndex for the backdrop and dialog.
*
* @param {number} backdropZ
* @param {number} dialogZ
*/
updateZIndex: function(backdropZ, dialogZ) {
this.backdrop_.style.zIndex = backdropZ;
this.dialog_.style.zIndex = dialogZ;
},
/**
* Shows the dialog. This is idempotent and will always succeed.
*/
show: function() {
this.setOpen(true);
},
/**
* Show this dialog modally.
*/
showModal: function() {
if (this.dialog_.hasAttribute('open')) {
throw 'Failed to execute \'showModal\' on dialog: The element is already open, and therefore cannot be opened modally.';
}
if (!document.body.contains(this.dialog_)) {
throw 'Failed to execute \'showModal\' on dialog: The element is not in a Document.'
}
if (!dialogPolyfill.dm.pushDialog(this)) {
throw 'Failed to execute \'showModal\' on dialog: There are too many open modal dialogs.'
}
this.show();
this.openAsModal_ = true;
// Optionally center vertically, relative to the current viewport.
if (dialogPolyfill.needsCentering(this.dialog_)) {
dialogPolyfill.reposition(this.dialog_);
this.replacedStyleTop_ = true;
} else {
this.replacedStyleTop_ = false;
}
// Insert backdrop.
this.backdrop_.addEventListener('click', this.backdropClick_);
this.dialog_.parentNode.insertBefore(this.backdrop_,
this.dialog_.nextSibling);
// Find element with `autofocus` attribute or first form control.
var target = this.dialog_.querySelector('[autofocus]:not([disabled])');
if (!target) {
// TODO: technically this is 'any focusable area'
var opts = ['button', 'input', 'keygen', 'select', 'textarea'];
var query = opts.map(function(el) {
return el + ':not([disabled])';
}).join(', ');
target = this.dialog_.querySelector(query);
}
document.activeElement && document.activeElement.blur && document.activeElement.blur();
target && target.focus();
},
/**
* Closes this HTMLDialogElement. This is optional vs clearing the open
* attribute, however this fires a 'close' event.
*
* @param {string=} opt_returnValue to use as the returnValue
*/
close: function(opt_returnValue) {
if (!this.dialog_.hasAttribute('open')) {
throw 'Failed to execute \'close\' on dialog: The element does not have an \'open\' attribute, and therefore cannot be closed.'
}
this.setOpen(false);
// Leave returnValue untouched in case it was set directly on the element
if (opt_returnValue !== undefined) {
this.dialog_.returnValue = opt_returnValue;
}
// Triggering "close" event for any attached listeners on the .
var closeEvent = new supportCustomEvent('close', {
bubbles: false,
cancelable: false
});
this.dialog_.dispatchEvent(closeEvent);
}
};
var dialogPolyfill = {};
dialogPolyfill.reposition = function(element) {
var scrollTop = document.body.scrollTop || document.documentElement.scrollTop;
var topValue = scrollTop + (window.innerHeight - element.offsetHeight) / 2;
element.style.top = Math.max(scrollTop, topValue) + 'px';
};
dialogPolyfill.isInlinePositionSetByStylesheet = function(element) {
for (var i = 0; i < document.styleSheets.length; ++i) {
var styleSheet = document.styleSheets[i];
var cssRules = null;
// Some browsers throw on cssRules.
try {
cssRules = styleSheet.cssRules;
} catch (e) {}
if (!cssRules)
continue;
for (var j = 0; j < cssRules.length; ++j) {
var rule = cssRules[j];
var selectedNodes = null;
// Ignore errors on invalid selector texts.
try {
selectedNodes = document.querySelectorAll(rule.selectorText);
} catch(e) {}
if (!selectedNodes || !inNodeList(selectedNodes, element))
continue;
var cssTop = rule.style.getPropertyValue('top');
var cssBottom = rule.style.getPropertyValue('bottom');
if ((cssTop && cssTop != 'auto') || (cssBottom && cssBottom != 'auto'))
return true;
}
}
return false;
};
dialogPolyfill.needsCentering = function(dialog) {
var computedStyle = window.getComputedStyle(dialog);
if (computedStyle.position != 'absolute') {
return false;
}
// We must determine whether the top/bottom specified value is non-auto. In
// WebKit/Blink, checking computedStyle.top == 'auto' is sufficient, but
// Firefox returns the used value. So we do this crazy thing instead: check
// the inline style and then go through CSS rules.
if ((dialog.style.top != 'auto' && dialog.style.top != '') ||
(dialog.style.bottom != 'auto' && dialog.style.bottom != ''))
return false;
return !dialogPolyfill.isInlinePositionSetByStylesheet(dialog);
};
/**
* @param {!Element} element to force upgrade
*/
dialogPolyfill.forceRegisterDialog = function(element) {
if (element.showModal) {
console.warn('This browser already supports , the polyfill ' +
'may not work correctly', element);
}
if (element.nodeName.toUpperCase() != 'DIALOG') {
throw 'Failed to register dialog: The element is not a dialog.';
}
new dialogPolyfillInfo(/** @type {!HTMLDialogElement} */ (element));
};
/**
* @param {!Element} element to upgrade
*/
dialogPolyfill.registerDialog = function(element) {
if (element.showModal) {
console.warn('Can\'t upgrade : already supported', element);
} else {
dialogPolyfill.forceRegisterDialog(element);
}
};
/**
* @constructor
*/
dialogPolyfill.DialogManager = function() {
/** @type {!Array} */
this.pendingDialogStack = [];
// The overlay is used to simulate how a modal dialog blocks the document.
// The blocking dialog is positioned on top of the overlay, and the rest of
// the dialogs on the pending dialog stack are positioned below it. In the
// actual implementation, the modal dialog stacking is controlled by the
// top layer, where z-index has no effect.
this.overlay = document.createElement('div');
this.overlay.className = '_dialog_overlay';
this.overlay.addEventListener('click', function(e) {
e.stopPropagation();
});
this.handleKey_ = this.handleKey_.bind(this);
this.handleFocus_ = this.handleFocus_.bind(this);
this.handleRemove_ = this.handleRemove_.bind(this);
this.zIndexLow_ = 100000;
this.zIndexHigh_ = 100000 + 150;
};
/**
* @return {Element} the top HTML dialog element, if any
*/
dialogPolyfill.DialogManager.prototype.topDialogElement = function() {
if (this.pendingDialogStack.length) {
var t = this.pendingDialogStack[this.pendingDialogStack.length - 1];
return t.dialog;
}
return null;
};
/**
* Called on the first modal dialog being shown. Adds the overlay and related
* handlers.
*/
dialogPolyfill.DialogManager.prototype.blockDocument = function() {
document.body.appendChild(this.overlay);
document.body.addEventListener('focus', this.handleFocus_, true);
document.addEventListener('keydown', this.handleKey_);
document.addEventListener('DOMNodeRemoved', this.handleRemove_);
};
/**
* Called on the first modal dialog being removed, i.e., when no more modal
* dialogs are visible.
*/
dialogPolyfill.DialogManager.prototype.unblockDocument = function() {
document.body.removeChild(this.overlay);
document.body.removeEventListener('focus', this.handleFocus_, true);
document.removeEventListener('keydown', this.handleKey_);
document.removeEventListener('DOMNodeRemoved', this.handleRemove_);
};
dialogPolyfill.DialogManager.prototype.updateStacking = function() {
var zIndex = this.zIndexLow_;
for (var i = 0; i < this.pendingDialogStack.length; i++) {
if (i == this.pendingDialogStack.length - 1) {
this.overlay.style.zIndex = zIndex++;
}
this.pendingDialogStack[i].updateZIndex(zIndex++, zIndex++);
}
};
dialogPolyfill.DialogManager.prototype.handleFocus_ = function(event) {
var candidate = findNearestDialog(/** @type {Element} */ (event.target));
if (candidate != this.topDialogElement()) {
event.preventDefault();
event.stopPropagation();
event.target.blur();
// TODO: Focus on the browser chrome (aka document) or the dialog itself
// depending on the tab direction.
return false;
}
};
dialogPolyfill.DialogManager.prototype.handleKey_ = function(event) {
if (event.keyCode == 27) {
event.preventDefault();
event.stopPropagation();
var cancelEvent = new supportCustomEvent('cancel', {
bubbles: false,
cancelable: true
});
var dialog = this.topDialogElement();
if (dialog.dispatchEvent(cancelEvent)) {
dialog.close();
}
}
};
dialogPolyfill.DialogManager.prototype.handleRemove_ = function(event) {
if (event.target.nodeName.toUpperCase() != 'DIALOG') { return; }
var dialog = /** @type {HTMLDialogElement} */ (event.target);
if (!dialog.open) { return; }
// Find a dialogPolyfillInfo which matches the removed .
this.pendingDialogStack.some(function(dpi) {
if (dpi.dialog == dialog) {
// This call will clear the dialogPolyfillInfo on this DialogManager
// as a side effect.
dpi.maybeHideModal();
return true;
}
});
};
/**
* @param {!dialogPolyfillInfo} dpi
* @return {boolean} whether the dialog was allowed
*/
dialogPolyfill.DialogManager.prototype.pushDialog = function(dpi) {
var allowed = (this.zIndexHigh_ - this.zIndexLow_) / 2 - 1;
if (this.pendingDialogStack.length >= allowed) {
return false;
}
this.pendingDialogStack.push(dpi);
if (this.pendingDialogStack.length == 1) {
this.blockDocument();
}
this.updateStacking();
return true;
};
/**
* @param {dialogPolyfillInfo} dpi
*/
dialogPolyfill.DialogManager.prototype.removeDialog = function(dpi) {
var index = this.pendingDialogStack.indexOf(dpi);
if (index == -1) { return; }
this.pendingDialogStack.splice(index, 1);
this.updateStacking();
if (this.pendingDialogStack.length == 0) {
this.unblockDocument();
}
};
dialogPolyfill.dm = new dialogPolyfill.DialogManager();
/**
* Global form 'dialog' method handler. Closes a dialog correctly on submit
* and possibly sets its return value.
*/
document.addEventListener('submit', function(ev) {
var target = ev.target;
if (!target || !target.hasAttribute('method')) { return; }
if (target.getAttribute('method').toLowerCase() != 'dialog') { return; }
ev.preventDefault();
var dialog = findNearestDialog(/** @type {Element} */ (ev.target));
if (!dialog) { return; }
// FIXME: The original event doesn't contain the element used to submit the
// form (if any). Look in some possible places.
var returnValue;
var cands = [document.activeElement, ev.explicitOriginalTarget];
var els = ['BUTTON', 'INPUT'];
cands.some(function(cand) {
if (cand && cand.form == ev.target && els.indexOf(cand.nodeName.toUpperCase()) != -1) {
returnValue = cand.value;
return true;
}
});
dialog.close(returnValue);
}, true);
window['dialogPolyfill'] = dialogPolyfill;
dialogPolyfill['forceRegisterDialog'] = dialogPolyfill.forceRegisterDialog;
dialogPolyfill['registerDialog'] = dialogPolyfill.registerDialog;
})();
