local-storage

问题 We have created a functionality where in we provide users to works with forms in an Offline Mode. We are using HTML 5 Local Storage to store all the offline data. All the forms have their own html files (for example:form-1.html,form-2.html.) We have a parent html page which makes use of an iframe to load the requried html file based on the form selected from the drop down list. After the user have made the modification in offline mode,the user can sync in their changes by logging to the ASP

问题 I am trying to store localStorage value in array and following this page Push JSON Objects to array in localStorage. My code is: function SaveDataToLocalStorage(data) { var a = []; // Parse the serialized data back into an aray of objects a = JSON.parse(localStorage.getItem('session')); // Push the new data (whether it be an object or anything else) onto the array a.push(data); // Alert the array value alert(a); // Should be something like [Object array] // Re-serialize the array back into a

问题 When a button is clicked I check if something exists in a localstorage key as such: var a = localStorage.getItem('foo'); if (typeof a != 'undefined') { // Function } but if the key doesn't exists at all, it return null. How can I call if not undefined and not null do function , else return true(?) or continue? 回答1: JavaScript has a concept of falsy values... i.e. 0, null , undefined and an empty string. Because of this, you should be able to just check if a is "truthy" (i.e. not one of the

问题 I want to set local storage before making request to WKWebView is that possible in any iOS version? Can't find a way to do it, the only class seem to relevant is WKWebsiteDataStore https://developer.apple.com/documentation/webkit/wkwebsitedatastore which only have method to read and delete. 回答1: From @paulvs comment here is what I do. Set navigation delegate to listen to finished callback. webView.navigationDelegate = self Then in the callback, check for value in localStorage and set if

问题 I am getting below error on running ng build command. removed node_modules folder and npm installe giving below warning npm WARN angular2-cool-storage@3.1.2 requires a peer of @angular/core@5.0.0 but none was installed. npm WARN angular2-cool-storage@3.1.2 requires a peer of @angular/common@^5.0.0 but none was installed. And for ng build below id deetail error: ERROR in Metadata version mismatch for module /node_modules/angular2-cool-storage/index.d.ts, found version 4, expected 3, resolving

问题 Consider a scenario where a browser has two or more tabs pointing to the same origin. Different event loops of the different tabs can lead to race conditions while accessing local storage and the different tabs can potentially overwrite each other's changes in local storage. I'm writing a web application that would face such race conditions, and so I wanted to know about the different synchronization primitives that could be employed in such a scenario. 回答1: My reading of the relevant W3C

问题 Understanding that the Javascript localStorage API is synchronous and thus blocking, is there any workaround that would allow one to display a waiting animation that doesn't freeze during the getItem() or setItem() operations? 回答1: If getting 300kB of data from local storage and parsing it with JSON.parse is too slow for a single synchronous blocking operation, you will have to split it up in smaller chunks. Those can be stored in single storage slots and shell be processed in an asynchronous

问题 Understanding that the Javascript localStorage API is synchronous and thus blocking, is there any workaround that would allow one to display a waiting animation that doesn't freeze during the getItem() or setItem() operations? 回答1: If getting 300kB of data from local storage and parsing it with JSON.parse is too slow for a single synchronous blocking operation, you will have to split it up in smaller chunks. Those can be stored in single storage slots and shell be processed in an asynchronous

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 5 years ago . I have one requirement where should be stored locally when internet is not available. It should handle it in cross browser compatible way. Now as I know there are variety of options to store the data locally (indexedDB, WebSQL, localStorage). All I really want is a unified API. I don't want to detect and write

问题 I need to load a list of names into my google chrome extension from a local file, How can this be done? what if the file is shipped with the extension itself? 回答1: If this file is shipped with your extension then you can just load it with XMLHttpRequest inside background page (use relative paths, with / being extension root folder). You can also make your file to be javascript ( var config=[...] ) and just load it with <script> into background page. 回答2: Say your json file is names.json in