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why does body.scrollHeight automatically increase but not decrease

由 旧时模样 提交于 2020-08-07 06:45:22
问题 My iframe.body has a scrollHeight property which I believe is read only I don't understand how it gets set. When I modify the iframe.body.innerHTML with some larger HTML, I notice the iframe.body.scrollHeight increases . Great! When we set $('#previewWindow').height(iframeDocument.body.scrollHeight) this means that the scrollbar is the right height for the new larger content However.... When I modify the iframe.body.innerHTML with some smaller HTML, I notice the iframe.body.scrollHeight

Material Angular scroll to element on mat-list

由 扶醉桌前 提交于 2020-07-21 00:36:50
问题 I have an Angular Material list with multiple elements, where one of them can be selected. When I load this list I want to scroll list up to that selected element, to make it more visible. Is there any option? I was thinking about something like in ngOnInit to check if item is selected, but I have really no idea how to scroll this list up to that item. Note: not whole page should be scrolled, only the elements on the list. component.html <mat-nav-list> <mat-list-item *ngFor="let item of items

Material Angular scroll to element on mat-list

由 别说谁变了你拦得住时间么 提交于 2020-07-21 00:36:30
问题 I have an Angular Material list with multiple elements, where one of them can be selected. When I load this list I want to scroll list up to that selected element, to make it more visible. Is there any option? I was thinking about something like in ngOnInit to check if item is selected, but I have really no idea how to scroll this list up to that item. Note: not whole page should be scrolled, only the elements on the list. component.html <mat-nav-list> <mat-list-item *ngFor="let item of items

Add class to body for each scrolling based on section ID

由 旧巷老猫 提交于 2020-07-20 04:42:23
问题 I have a page layout like this. <body> <section id="s1">...</div> <section id="s2">...</div> <section id="s3">...</div> </body> I need to add class to body tag whenever the <section> meet the top by scrolling. like <body class="s1"> for #s1 section and <body class="s2"> for #s2 . How this can be done using jquery? Please help. 回答1: This is probably what you want: http://jsbin.com/tabolida/1/edit?html,js,output var bodyEl = $("body"); $(window).on("scroll", function() { var scrollTop = $(this)

Add class to body for each scrolling based on section ID

由 蹲街弑〆低调 提交于 2020-07-20 04:42:06
问题 I have a page layout like this. <body> <section id="s1">...</div> <section id="s2">...</div> <section id="s3">...</div> </body> I need to add class to body tag whenever the <section> meet the top by scrolling. like <body class="s1"> for #s1 section and <body class="s2"> for #s2 . How this can be done using jquery? Please help. 回答1: This is probably what you want: http://jsbin.com/tabolida/1/edit?html,js,output var bodyEl = $("body"); $(window).on("scroll", function() { var scrollTop = $(this)

jquery - carry out function after scroll past x pixels [duplicate]

由 て烟熏妆下的殇ゞ 提交于 2020-07-18 07:25:53
问题 This question already has answers here : jQuery Animating Elements by Scrolling the page (2 answers) Closed 6 years ago . I've made a nav on my site which is absolute positioned. I've made a class to make this fixed to the top of the screen. What I'm trying to find out is how to carry out a function (toggleClass in this instance) after the windows has been scrolled x amount of pixels down the page (500 px in this instance) 回答1: The procedure is: Listen to the scroll event to detect the user's

Scroll multiple scrollable widgets in sync

由 徘徊边缘 提交于 2020-07-18 04:38:07
问题 to put it simply: is there a way to have multiple sccrollable widgets (say, SingleSchildScrollView ) together in sync? i just want 2 scrollables that can scroll the other as i scroll one. this way i can use Stack to put them on top of each other and the one behind can scroll following the front one. or maybe put them in another set of Column or Row so that they are separate, but still scrolls by just scrolling either one. i tried using controller but it does not seems to be doing what i think

How to scroll Panel by keyboard?

由 ε祈祈猫儿з 提交于 2020-07-09 09:36:17
问题 Inside a form, I have a Panel that contains a single PictureBox and nothing else. One of the requirements is that the user should be able to scroll through the contents of that panel by using only the keyboard. In other words, they would first need to tab into the panel and then use the Up/Down or PageUp/PageDown keys to scroll. According to the Microsoft Docs, The TabStop property has no effect on the Panel control as it is a container object. Which, after trying it out appears to be very

How to maintain Scroll Position When Adding Content to the Top of a Container in React

由 一世执手 提交于 2020-07-07 08:35:54
问题 I am trying to create messaging app in react. When ever the scroll is at the top, it dispatch an action to fetch older messages but the scroll still stays at top even after the messages are fetched so it keeps on firing the dispatch action to get more messages. Does any one know how to main the scroll position when adding content to the top of parent containers's children so that scroll position doesn't stay at top and stops firing request. <Fragment> {messagesLoading && messages.length > 0 &

How to maintain Scroll Position When Adding Content to the Top of a Container in React

由 北城余情 提交于 2020-07-07 08:31:56
问题 I am trying to create messaging app in react. When ever the scroll is at the top, it dispatch an action to fetch older messages but the scroll still stays at top even after the messages are fetched so it keeps on firing the dispatch action to get more messages. Does any one know how to main the scroll position when adding content to the top of parent containers's children so that scroll position doesn't stay at top and stops firing request. <Fragment> {messagesLoading && messages.length > 0 &
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