Programmer Group

Catalog Overview Image size adjustment algorithm How to use controls on Web pages? How to get the uploaded image from the control? source code Reference Overview We have long-term problems with image resizing and cropping. Our problem is that if we resize on the server side, the image qualit ...

Native JavaScript+Css Simulated Select Dropdown Preface Implementation Details Technology involved Effect Display Code Display Html structure Css structure JavaScript structure summary Preface Hello, FEer s!In our front-end development career, there are many details, some need to be compatib ...

Recently, there is a UE design that is the display of the horizontal tree. After looking up some information on the Internet, we didn't find the code of the horizontal tree. So we use:: before and:: after pseudo elements plus jq to implement it simply according to the actual needs. In the future, we have the opportunity to stri ...

We may encounter the upload of large files in our work. If we transfer them once, we may encounter various problems such as network and timeout. Here, we will introduce the scheme in two ways: fragment upload and breakpoint continue transfer. 1, Slice upload Principle of fragment upload: the front end f ...

4, Web development 1, introduction Use SpringBoot; 1) . create a spring boot application and select the modules we need; 2) Spring boot has configured these scenarios by default. You only need to specify a few configurations in the configuration file to run them 3) . write your own business code; Pr ...

background The latest project involves generating barcodes and printing them out. Individuals often write java, but using the back end can be cumbersome.It is convenient to use js, here is a brief introduction. There's a lot of stuff on the web about generating barcodes. JsBarcode works best with github addresses: https://git ...

Because the WPS plug-in uses NPAPI mechanism to interact with browsers, it is required that browsers using plug-ins must support NPAPI mechanism and enable NPAPI mechanism. The following are common supported browsers and their versions: FireFox browser 52 and versions less than 52 (NPAPI is no longer supported for versions higher than 52) Chr ...

Application Security cookie Ordinary cookie What do we usually have in our user list When you are shopping, join the shopping cart and let you log in. After you log in, how does he know you are logged in The value of token is random and exists in the cookie Set up Prototype: how to set cookie s ...

The answer is already here: How to center elements horizontally and vertically (19 answers) Closed 11 months ago. What's the best way to center < div > elements vertically and horizontally on a page? I know that margin lef ...

According to the HTML specification, the select tag in HTML has no readonly attribute, only the disabled attribute. Therefore, if you want to prevent users from changing the drop-down menu, you must use disabled. The only problem is that disabled HTML form input is not included in POST / GET data. What is the best way to simulate the rea ...