indexeddb | 易学教程

indexeddb put not update a value, it creates a new (id)

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问题 I have a table with form, surname, lastname, email and a rectangle. I have to insert, in the rectangle, an array with arrays with points of timelines etc. I create a customer with form, surname, lastname and email, add them to indexeddb, load them later to insert the rectangle-array. After that, I want to put the newobjectstore in the indexeddb where the email is the same from my customer I choose/inserted. But with this code my array will be put in a new Objectstore with its own ID. function

How to return auto increment id from objectstore.put() in an IndexedDB?

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问题 How do I return the auto incremented ID after inserting a record into an IndexedDB using objectstore.put()? Below is my code: idb.indexedDB.addData = function (objectStore, data) { var db = idb.indexedDB.db; var trans = db.transaction([objectStore], READ_WRITE); var store = trans.objectStore(objectStore); 　　　 var request = store.put(data); request.onsuccess = function (e) { //Success, how do I get the auto incremented id? }; request.onerror = function (e) { console.log("Error Adding: ", e);

Is “Cross Domain IndexedDB” possible

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问题 xxx.com how to access indexeddb of yyy.com. These 2 domain includes same script is it possible. Possible with Iframe technique? 回答1: You can do it with iframe technique (loading iframe with same domain in different domains) example: myStorageIframe.com a.com b.com c.com you can add the iframe to each domain, and store/get items with post-message. each domain will communicate with the frame, and by this the storage will be shared between all domains. The pitfalls of this is that in Safari it

Is “Cross Domain IndexedDB” possible

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Is there a way for a progressive web app to save a lot of data without using up all the memory?

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问题 what i'm trying to do is save (2GB +-) of data for offline use. i do this using Dexie( wrapper for indexeddb) for my Progressive web app. My problem is that i use all of my laptops/android/IOS device's memory(RAM). Is there a way for a progressive web app to save a lor of data without using up all the memory? -localstorage has limits i think and also relies on memory or am i wrong ? -Filesystem API is it possible ? -LargeLocalStorage is it possible ? (https://github.com/tantaman

How to store form data in local storage?

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问题 I am implementing one form submit process, But I am not using any DB(Backend). I want to store form data in client side or browser. So I am planning to use localstorage. <html> <head> <title>Bootstrap Example</title> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.0/css/bootstrap.min.css"> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.0/jquery.min.js"></script

Dexie : How to add to array in nested object

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问题 I am using Dexie IndexedDB wrapper and I am trying to add an object to an existing array which in inside a nested object. The structure looks similar to below { Name : 'John', age : 33, tags : { skill: [{ first: '.NET', second: 'JAVA', third: [{special1:'sleep'},{special2:'eat'}] }] } } I have tried many way to push object special3:'run' to skill.third but without success. My last attempt looked something like this const pathObject = {}; const fullPath = 'result.tags.skill[3].third';

IndexedDB - ObjectStores vs multiple databases vs indices?

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问题 I was wondering when it would be a good idea to have a single database vs one database with multiple object stores. I've read most tutorials on the web as well as looked at the specification for indexedDB, but could not find a good example comparing these different concepts. Does anyone have a concrete example (a design model using multiple object stores and/or code) for this sort of thing? 回答1: As long as there is no cross transactional manipulation among object stores, you can separate them

Cannot read property 'transaction' of undefined IndexedDB

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问题 I'm using IndexDB to create an object store of users but when trying to add users I get an error on the var request = db.transaction(['person'], 'readwrite') line. The error given is: "Uncaught TypeError: Cannot read property 'transaction' of undefined at add (test.js:32) at test.js:45" My script looks like this: var request = window.indexedDB.open("connectDB", 1); request.onerror = function (event) { console.log('The database is opened failed'); }; var db; request.onsuccess = function (event

IN Operator equivalence in indexedDB

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问题 I want to execute this query select * from properties where propertyCode IN ("field1", "field2", "field3") How can I achieve this in IndexedDB I tried this thing getData : function (indexName, params, objectStoreName) { var defer = $q.defer(), db, transaction, index, cursorRequest, request, objectStore, resultSet, dataList = []; request = indexedDB.open('test'); request.onsuccess = function (event) { db = request.result; transaction = db.transaction(objectStoreName); objectStore = transaction