viewport

I have an AJAX app built for mobile Safari browser that needs to display different types of content. For some content, I need user-scalable=1 and for other ones, I need user-scalable=0 . Is there a way to modify the value of the content attribute without refreshing the page? <meta name="viewport" content="width=device-width; initial-scale=1.0; maximum-scale=1.0; user-scalable=0;" /> I realize this is a little old, but, yes it can be done. Some javascript to get you started: viewport = document.querySelector("meta[name=viewport]"); viewport.setAttribute('content', 'width=device-width, initial

I'm trying to add a data-table to a graph made in ggplot (similar to the excel functionality but with the flexibility to change the axis its on) I've had a few goes at it and keep hitting a problem with scaling so attempt 1) was library(grid) library(gridExtra) library(ggplot2) xta=data.frame(f=rnorm(37,mean=400,sd=50)) xta$n=0 for(i in 1:37){xta$n[i]<-paste(sample(letters,4),collapse='')} xta$c=0 for(i in 1:37){xta$c[i]<-sample((1:6),1)} rect=data.frame(xmi=seq(0.5,36.5,1),xma=seq(1.5,37.5,1),ymi=0,yma=10) xta=cbind(xta,rect) a = ggplot(data=xta,aes(x=n,y=f,fill=c)) + geom_bar(stat='identity'

第一步：使用淘宝的lib/flexible+rem布局 原理： 　　 rem布局： 使用rem作为元素大小的单位，rem=fount-size，根据不同的屏幕宽度设置不同的fount-size值，这样元素也会跟着屏幕变大或变小 　　 lib/flexible： 　　　　通过js查询屏幕大小，设置viewport标签的同时始终将fount-size设置为屏幕宽度的1/10。 　　　　我们也应该将设计稿分成1/10与之对相应， 　　　　由此得到1rem=屏幕宽度的1/10=设计稿的1/10 　　　　如果设计稿大小为750px，则1rem=75px， 　　　　比如在设计稿上量到一个宽度为150的元素，可以通过150/75得到此元素在设备中的宽度为2rem 用法： 　　 去掉html中的viewport标签，vue项目在public/index.html中操作 　　　 vue项目中在main.js中引入flexible 　　　import ' lib/flexible/flexible.js ' 引入后就实现了动态设置fount-size和viewport标签了，接下来我们只要在项目中以rem为单位写样式就可以了，但是 每次都要手动计算rem太麻烦，可以使用插件postcss-px2rem-exclude 第二步：使用postcss-px2rem-exclude将px转换为rem 　　　

So I've just discovered viewport units, and I really want to use them. First challenge: My element has a "base size" of 760x670 pixels. I want to use viewport units to scale it up so that either the height is 100vh , or the width is 100vw , whichever is smaller. Unfortnately, although I can use 100vmin to get the smaller of the two, I can only apply it to the width or the height, not both. Currently I'm using: #root { width: 760px; height: 670px; width: 100vw; height: calc(670vw/760); } This scales the width to fit the screen, resulting in vertical scrolling. This isn't too bad, but I'd prefer

I'm working on a webApp that should resize to any screen size a device could have. On iOS and older android versions the viewport tag works fine. The picture on the screen is always resized to fit the screen. (Like described here: https://developer.apple.com/library/archive/documentation/AppleApplications/Reference/SafariWebContent/UsingtheViewport/UsingtheViewport.html#//apple_ref/doc/uid/TP40006509-SW19 ) On the Galaxy Nexus (Android 4.0) it won't work. On the left and right side is about 20px space and I don't know why he does this. My viewport tag looks like this: <meta name="viewport"

I need to find a good solution to the following problem. I see a lot of people asking about tracking if an element is in or outside of view Port for the page or browser window. I need to be able to replicate this action, but inside a DIV that scrolls, with overflow:scroll for example. Does anyone know of a good example, for this specific action? Thanks in advance. i had the same problem before, i have ended up with the following function.the first parameter is for the element to check, the second is to check if the element is partially in-view.it is for vertical check only, you can extend it

前言的一些碎碎念：最近一直在写移动端的页面，不过一直是用的别人造好的轮子，很多时候并没有想那是为什么，那是怎么样要那么写，就跟着别人的文档去了。本以为自己对移动端的那一丢丢理解，结果很多东西都特么有问题，所以，今天停下了手中的一些东西，来谈下移动端的布局方案吧 一. viewport 什么是viewport 简单来讲，viewport就是浏览器上，用来显示网页的那一部分区域了，也就是说，浏览器的实际宽度，是和我们手机的宽度不一样的，无论你的手机宽度是320px，还是640px，在手机浏览器内部的宽度，始终会是浏览器本身的viewport。如今的浏览器，都会给自己的本身提供一个viewport的默认值，可能是980px，或者是其他值。就以手机来说吧，目前，新版本的手机浏览器，绝大部分是以980px作为默认的viewport值的。我这里对新版本的不同平台下的浏览器做了测试，经过测试，iphone下的默认viewport为980px，安卓下的浏览器，目前主流的最新浏览器（比如chrome，还有很多国产的像qq，uc）的viewport也是980px了。 viewport是用来干什么的 viewport的默认值，一般来说是大于手机屏幕的。这样就可以做到当我们在浏览桌面端网页的时候，可以让桌面端端网页正常显示（我们普通页面设计的时候，一般页面的主区域是以960px来做的，所以980px这个值