document | 易学教程

Check if the browser supports document.querySelectorAll in JavaScript

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问题 Now although most modern browser support document.querySelectorAll() , you may run into problems with older versions of Internet Explorer. The obvious way of checking if the browser supports a function would be: if(document.querySelectorAll){ //some random code } But from what I understand some browsers like (IE8) don't support certain properties, like ' body * '. Is there a better way to check if document.querySelectorAll('body *') will actually work? 回答1: document.querySelectorAll will

How do I refer to the document object of an <iframe> from the parent page, using jQuery?

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问题 I'm trying to access the document object of a page that lives in an <iframe> from the host page. In other words, I have a page that has an <iframe> in it, and I want to use jQuery on that page (the parent page) to access the document object of that <iframe>. Specifically, I'm trying to find the height of the <iframe>d document once its content is rendered (onload) so that I can then resize the <iframe> from the parent page to match the height of the <iframe>'s content exactly. If it's

Creating a document for taking notes about a book using Git?

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问题 I have never used Git before. I am supposed to use it to take notes on a book, but i haven't a clue how to get started. Do I create a .text file? The only things I have found are instructions on how to keep track of projects, but nothing about the kinds of projects I might use. I just want to make a word document that can be read, altered, and printed with ease. Can anyone help me out? 回答1: To take advantage in using git for storing documentation you should use non binary formats like: html

javascript Document ready firefox (jQuery)

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问题 In FireFox I have this jQuery at the end of the body: $(document).ready(function() { $.getScript('LiveMapsJavascriptProvider.aspx?type=reference&value=6', init); }); There are a lot of js files in the head that are needed to be all loaded before this would work. So I put my call in a document.ready event. It doesn't work. IE works fine. If I put an alert(''); before I call $.getScript it works. It looks like a problem with the scripts not getting loaded yet? I thought Document.ready was fired

Calculating size of Google Firestore documents

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Firestore docs give details of how to manually calculate the stored size of a document, but there does not seem to be a function provided for this on any of document reference, snapshot, or metadata. Before I attempt to use my own calculation, does anyone know of an official or unofficial function for this? Here is my (completely untested) first cut for such a function from my interpretation of the docs at https://firebase.google.com/docs/firestore/storage-size function calcFirestoreDocSize(collectionName, docId, docObject) { let docNameSize = encodedLength(collectionName) + 1 + 16 let

MongoDB: what are the differences between documents, records, and attributes?

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The documentation on documents seems to favor the term "document", and also refers to "database records". Elsewhere, competent MongoDB developers have apparently interchangeably used " attributes " and " records ". What is the correct/official terminology to use in various instances? Is it documented somewhere on mongodb.org? The confusion is merely because many MongoDB users are not just MongoDB users but also use 100 other techs including SQL. I personally have mixed up my language as well, it's not uncommon however document and database records are the same thing and properties, attributes

General reasons not to deal with Document's and Element's prototype

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问题 Are there general reasons not to deal with Document's and Element's prototype? I like to create my own little framework, because my current project doesn't need the mass of features of the existing frameworks. I don't need to support browsers which don't support Element/Document-constructor and also will not execute scripts that are not under my control. So would you recommend to extend the prototype or should I go the usual way and create own objects from Element/Document? 回答1: Do you plan

List iPhone application document files

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Is there a way to get the filenames of the files in an iPhone application's document-folder? How do you do that? NSFileManager *manager = [NSFileManager defaultManager]; NSArray *fileList = [manager directoryContentsAtPath:documentsDirectory]; for (NSString *s in fileList){ NSLog(s); } 来源： https://stackoverflow.com/questions/1433514/list-iphone-application-document-files

DefaultDocument suddenly not working on IIS7

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I have a website which has been running on IIS7 for about 2 months. We have the default documents set up to load a default.asp page when users go to the domain with no page. Suddenly this morning, I am getting errors and the default document will not load. If I type the default.asp, the file loads just fine. Error Info: Module: DefaultDocumentModule Notification: ExecuteRequestHandler Handler: StaticFile Error Code: 0x80070002 here is a section from my applicationhost.config: <system.webServer> <asp> <cache diskTemplateCacheDirectory="%SystemDrive%\inetpub\temp\ASP Compiled Templates" /> </asp

Lucene - retrieve all values for a multi-valued field in a document

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I added a field in Lucene which is multi-valued as such: String categoriesForItem = getCategories(); // returns "category1, category2, cat3" from a DB call String [] categoriesForItems = categoriesForItem.split(","; for(String cat : categoriesForItems) { doc.add(new StringField("categories", cat , Field.Store.YES)); // doc is a Document } later when I am searching for items in a category everything works as expected, but when I get a Document and do: String categories= doc.getField("categories").stringValue(); I only get the last inserted value for that document rather than all the values that