Mercurial > libervia-templates
changeset 83:caab77328b1c
js (common): added a method to check if local or session storage is available
author | Goffi <goffi@goffi.org> |
---|---|
date | Wed, 03 Jan 2018 01:12:16 +0100 (2018-01-03) |
parents | 6ba0129a9a4e |
children | b2ef34e602cf |
files | default/static/common.js |
diffstat | 1 files changed, 49 insertions(+), 2 deletions(-) [+] |
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--- a/default/static/common.js Wed Jan 03 01:12:16 2018 +0100 +++ b/default/static/common.js Wed Jan 03 01:12:16 2018 +0100 @@ -1,3 +1,48 @@ +var __session_storage_available; +var __local_storage_available; + +function storageAvailable(type) { + /* check if session or local storage is available + * + * @param type(string): "session" or "storage" + * @return (boolean): true if requested storage is available + */ + console.assert(type == 'session' || type == 'storage', "bad storage type (%s)", type); + const var_name = '__' + type + '_storage_available'; + var available = window[var_name]; + if (available === undefined) { + // test method from https://developer.mozilla.org/en-US/docs/Web/API/Web_Storage_API/Using_the_Web_Storage_API + var storage = window[type + 'Storage']; + try { + x = '__storage_test__'; + storage.setItem(x, x); + storage.removeItem(x); + available = true; + } + catch(e) { + available = e instanceof DOMException && ( + // everything except Firefox + e.code === 22 || + // Firefox + e.code === 1014 || + // test name field too, because code might not be present + // everything except Firefox + e.name === 'QuotaExceededError' || + // Firefox + e.name === 'NS_ERROR_DOM_QUOTA_REACHED') && + // acknowledge QuotaExceededError only if there's something already stored + storage.length !== 0; + } + + if (!available) { + console.warn("%s storage not available", type); + } + window[var_name] = available; + } + + return available; +} + function toggle_clicked_class_tag(tag_name, class_name='clicked') { for (let elt of document.getElementsByTagName(tag_name)) { elt.classList.toggle(class_name); @@ -46,9 +91,11 @@ /* toggle clicked, and fix max-height on transitionend * * needed to workaround transition issue with max-height:none + * inspired from https://css-tricks.com/using-css-transitions-auto-dimensions, + * thanks to Brandon Smith * - * inspired from https://css-tricks.com/using-css-transitions-auto-dimensions, - * thanks to Brandon Smith */ + * @param arg: element to toggle (id as string, or element itself) + * */ elt = get_elt(arg); if (!elt.classList.contains("clicked")) {