Hướng dẫn how many classes are there in bootstrap? - có bao nhiêu lớp trong bootstrap?

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Có bao nhiêu lớp bootstrap có?
Các lớp bootstrap là gì?
Div có thể có bao nhiêu lớp?
Bootstrap 3 hay 4 có tốt hơn không?

.active Adds a grey background color to the table row (<tr> or table cell (<td>) (same color used on hover) Try it Tables .active Adds a gray background color to the active link in a default navbar. Adds a black background and a white color to the current link inside an inverted navbar. Try it Navbar .active Adds a blue background color to the active list item in a list group Try it List Groups .active Adds a blue background color to simulate a "pressed" button Try it Buttons .active Animates a striped progress bar Try it Progress Bars .active Adds a blue background color to the active dropdown item in a dropdown Try it Dropdowns .active Adds a blue background color to the active pagination link (to highlight the current page) Try it Pagination .affix The Affix plugin allows an element to become affixed (locked/sticky) to an area on the page. It toggles <tr>0 on and off Try it Affix <tr>1 Creates an alert message box Try it Alerts <tr>2 Red alert box. Indicates a dangerous or potentially negative action Try it Alerts <tr>3 Together with the <tr>4 class, this class is used to close the alert Try it Alerts <tr>5 Light-blue alert box. Indicates some information Try it Alerts <tr>6 Used on links inside alerts to add matching colored links Try it Alerts <tr>7 Green alert box. Indicates a successful or positive action Try it Alerts <tr>8 Yellow alert box. Indicates caution should be taken with this action Try it Alerts <tr>9 Creates a circular badge (grey circle - often used as a numerical indicator) Try it Badges <td>0 Adds a red background color to an element. Represents danger or a negative action Try it Helpers <td>1 Adds a light-blue background color to an element. Represents some information Try it Helpers <td>2 Adds a blue background color to an element. Represents something important Try it Helpers <td>3 Adds a green background color to an element. Indicates success or a positive action Try it Helpers <td>4 Adds a yellow background color to an element. Represents a warning or a negative action Try it Helpers <td>5 A pagination. Indicates the current page's location within a navigational hierarchy Try it Pagination <td>6 Creates a basic button (gray background and rounded corners) Try it Buttons <td>7 Creates a block level button that spans the entire width of the parent element Try it Buttons <td>8 Red button. Indicates danger or a negative action Try it Buttons <td>9 Default button. White background and grey border Try it Buttons .active0 Groups buttons together on a single line Try it Button Groups .active1 Makes a group of buttons span the entire width of the screen Try it Button Groups .active2 Large button group (makes all buttons in a button group larger - increased font-size and padding) Try it Button Groups .active3 Small button group (makes all buttons in a button group smaller) Try it Button Groups .active4 Extra small button group (makes all buttons in a button group extra small) Try it Button Groups .active5 Makes a button group appear vertically stacked Try it Button Groups .active6 Light-blue button. Represents information Try it Buttons .active7 Makes a button look like a link (get button behavior) Try it Buttons .active8 Large button Try it Buttons .active9 Blue button. Try it Buttons .active0 Small button Try it Buttons .active1 Green button. Indicates success or a positive action Try it Buttons .active2 Yellow button. Represents warning or a negative action Try it Buttons .active3 Extra small button Try it Buttons .active4 Adds a caption text inside a .active5 Try it Images .active6 Creates a caret arrow icon , which indicates that the button is a dropdown Try it Dropdowns .active7 Creates a carousel (slideshow) Try it Carousel .active8 Creates a caption text for each slide in the carousel Try it Carousel .active9 Container for next and previous links Try it Carousel .active0 Adds little dots/indicators at the bottom of each slide (which indicates how many slides there is in the carousel, and which slide the user are currently viewing) Try it Carousel .active1 Container for slide items Try it Carousel .active2 Centers any element (Sets an element to .active3 with .active4 and .active5) Try it Helpers .active6 Container for checkboxes Try it Inputs .active7 Makes multiple checkboxes appear on the same line Try it Inputs .active8 Clears floats Try it Helpers <tr>4 Indicates a close icon Try it Helpers .active0 Responsive grid (span 1-12 column). Extra small devices Phones (< 768px), Small devices Tablets (≥768px), Medium devices Desktops (≥992px), Large devices Desktops (≥1200px). Column values can be 1-12. Try it Grid .active1 Move columns to the right. These classes increase the left margin of a column by * columns Try it Grid .active2 Changes the order of the grid columns Try it Grid .active3 Changes the order of the grid columns Try it Grid .active4 Indicates collapsible content - which can be hidden or shown on demand Try it Collapse .active5 Show the collapsible content by default Try it Collapse .active6 Fixed width container with widths determined by screen sites. Equal margin on the left and right. Try it Containers .active7 A container that spans the full width of the screen Try it Containers .active8 Allows a label to be used for form validation Try it Forms .active9 Adds a red background to the table row (<tr> or table cell (<td>). Indicates a dangerous or potentially negative action Try it Tables .active2 Disables a button (adds opacity and a "no-parking-sign" icon on hover) Try it Buttons .active2 Disables a dropdown item (adds a grey text color and a "no-parking-sign" icon on hover) Try it Dropdowns .active2 Disables a pagination link (cannot be clicked - adds a grey text color and a "no-parking-sign" icon on hover) Try it Pagination .active2 Disables a list item in a list group (cannot be clicked - adds a grey background color and a "no-parking-sign" icon on hover) Try it List Groups .active6 Used to separate links in the dropdown menu with a thin horizontal border Try it Dropdowns .active7 Lines up the terms .active8 and descriptions .active9 in .active0 elements side-by-side. Starts off like default .active0s, but when the browser window expands, it will line up side-by-side Try it Typography .active2 Creates a toggleable menu that allows the user to choose one value from a predefined list Try it Dropdowns .active3 Used to add headers inside the dropdown menu Try it Dropdowns .active4 Adds the default styles for the dropdown menu container Try it Dropdowns .active5 Right-aligns a dropdown menu Try it Dropdowns .active6 Used on the button that should hide and show (toggle) the dropdown menu Try it Dropdowns .active7 Indicates a dropup menu (upwards instead of downwards) Try it Dropdowns .active8 Container for embedded content. Makes videos or slideshows scale properly on any device Try it Images .active9 Container for embedded content. Creates an 16:9 aspect ratio embedded content Try it Images .affix0 Container for embedded content. Creates an 4:3 aspect ratio embedded content Try it Images .affix1 Used inside .active8. Scales the video nicely to the parent element Try it Images .affix3 Adds a fading effect when closing an alert box Try it Alerts .affix4 Used on input, textarea, and select elements to span the entire width of the page and make them responsive Try it Forms .affix5 Form validation class Try it Inputs 2 .affix6 Adds plain text next to a form label within a horizontal form Try it Inputs 2 .affix7 Container for form input and label Try it Forms .affix8 Makes a

left-aligned with inline-block controls (This only applies to forms within viewports that are at least 768px wide) Try it Forms .affix9 Aligns labels and groups of form controls in a horizontal layout Try it Forms <tr>00 Creates an icon. Bootstrap provides 260 free glyphicons from the Glyphicons Halflings set Try it Glyphicons <tr>01 Adds a red color to the label and a red border to the input, as well as an error icon inside the input (used together with <tr>02) Try it Forms <tr>02 Adds feedback icons for inputs (checkmark, warning and error signs) Try it Forms <tr>04 Adds a green color to the label and a green border to the input, as well as a checkmark icon inside the input (used together with <tr>02) Try it Forms <tr>06 Adds a yellow/orange color to the label and a yellow/orange border to the input, as well as a checkmark icon inside the input (used together with <tr>02) Try it Forms <tr>08 A block of help text that breaks onto a new line and may extend beyond one line. Try it Input Sizing <tr>09 Forces an element to be hidden (<tr>10) Try it Helpers <tr>11 Hides content depending on screen size Try it Helpers <tr>12 Deprecated. Use <tr>09 instead Try it Helpers <tr>14 Makes an element look like a heading of the chosen class (h2-h6) Try it Typography <tr>15 Used in the navbar to create a hamburger menu (three horizontal bars) Try it Navbar <tr>16 Unicode icon (arrow pointing right), used in carousels. This is often replaced with a glyphicon Try it Carousel <tr>17 Unicode icon (arrow pointing left), used in carousels. This is often replaced with a glyphicon Try it Carousel <tr>18 Shapes an image to a circle (not supported in IE8 and earlier) Try it Images <tr>19 Makes an image responsive Try it Images <tr>20 Adds rounded corners to an image Try it Images <tr>21 Shapes an image to a thumbnail (borders) Try it Images <tr>22 Fades in tabs Try it Tabs <tr>23 Adds a light-blue background to the table row (<tr> or table cell (<td>). Indicates a neutral informative change or action Try it Tables <tr>26 Displays the text inside an <tr>27 element in a slightly smaller font size Try it Typography <tr>28 Container to enhance an input by adding an icon, text or a button in front or behind it as a "help text" Try it Inputs <tr>29 Large input group Try it Inputs <tr>30 Small input group Try it Inputs <tr>31 Together with the <tr>28 class, this class makes it possible to add an icon or help text next to the input field Try it Inputs <tr>33 Together with the <tr>28 class, this class attaches a button next to an input. Often used as a search bar Try it Inputs <tr>35 Large input field Try it Input Sizing <tr>36 Small input field Try it Input Sizing <tr>37 Makes an element invisible (<tr>38). Note: Even though the element is invisible, it will take up space on the page Try it Helpers <tr>39 Class added to each carousel item. May be text or images Try it Carousel <tr>40 Creates a padded grey box with rounded corners that enlarges the font sizes of the text inside it. Creates a big box for calling extra attention to some special content or information Try it Jumbotron <tr>41 Adds a grey rounded box to an element. Provides additional information about something (e.g. "New") Try it Labels <tr>42 Red label Try it Labels <tr>43 Light-blue label Try it Labels <tr>44 Green label Try it Labels <tr>45 Yellow label Try it Labels <tr>46 Increase the font size and line height of a paragraph Try it Typography <tr>47 Used to identify the left carousel control Try it Carousel <tr>48 Creates a bordered list group for <tr>49 elements Try it List Group <tr>50 Added to each <tr>49 element in the list group Try it List Group <tr>52 Creates a list group heading (used on other elements besides <tr>49) Try it List Group <tr>54 Used for item text inside the list group (used on other elements besides <tr>49) Try it List Group <tr>56 Red background color for a list item in a list group Try it List Group <tr>57 Light-blue background color for a list item in a list group Try it List Group <tr>58 Green background color for a list item in a list group Try it List Group <tr>59 Yellow background color for a list item in a list group Try it List Group <tr>60 Places all list items on a single line (horizontal menu) Try it Tabs <tr>61 Removes all default list-style (bullets, left margin, etc.) styling from a <tr>62 or <tr>63 list Try it Typography <tr>64 Highlights text: Highlighted text Try it Typography <tr>65 Aligns media objects (like images or videos - often used for comments in a blog post etc) Try it Media Objects <tr>66 Text that should appear next to a media object Try it Media Objects <tr>67 Creates a heading inside the media object Try it Media Objects <tr>68 Nested media lists Try it Media Objects <tr>69 Indicates a media object (image or video) Try it Media Objects <tr>70 Identifies the content as a modal and brings focus to it Try it Modals <tr>71 Defines the style for the body of the modal. Add any HTML markup here (p, img, etc) Try it Modals <tr>72 Styles the modal (border, background-color, etc). Inside this, add the modal's header, body and footer, if needed Try it Modals <tr>73 Sets the proper width and margin of the modal Try it Modals <tr>74 The footer of the modal (often contains an action button and a close button) Try it Modals <tr>75 The header of the modal (often contains a title and a close button) Try it Modals <tr>76 Large modal (wider than default) Try it Modals <tr>77 Used on the <tr>78 element to prevent page scrolling (<tr>79) Try it Modals <tr>80 Small modal (less width) Try it Modals <tr>81 The title of the modal Try it Modals <tr>82 Indicates a tabbed menu Try it Tabs <tr>83 Indicates a pill menu Try it Tabs <tr>84 Used on a <tr>85 container that contains the list items with links inside a navigation bar Try it Navbar <tr>86 Centers tabs/pills. Note that on screens smaller than 768px the items are stacked (content will remain centered) Try it Tabs <tr>87 Vertically stack tabs or pills Try it Tabs <tr>88 Creates a tabbed menu Try it Tabs <tr>89 Creates a navigation bar Try it Navbar <tr>90 Added to a link or a header element inside the navbar to represent a logo or a header Try it Navbar <tr>91 Vertically aligns a button inside a navbar Try it Navbar <tr>92 Collapses the navbar (hidden and replaced with a menu/hamburger icon on mobile phones and small tablets) Try it Navbar <tr>93 Creates a default navigation bar (light-grey background color) Try it Navbar <tr>94 Makes the navbar stay at the bottom of the screen (sticky/fixed) Try it Navbar <tr>95 Makes the navbar stay at the top of the screen (sticky/fixed) Try it Navbar <tr>96 Added to form elements inside the navbar to vertically center them (proper padding) Try it Navbar <tr>97 Added to a container element that contains the link/element that represent a logo or a header Try it Navbar <tr>98 Creates a black navigation bar (instead of light-grey) Try it Navbar <tr>99 Aligns nav links, forms, buttons, or text, in the navbar to the left Try it Navbar <td>00 Styles an element to look like a link inside the navbar (anchors get proper padding and an underline on hover, while other elements like p or span gets a default hover effect - white color in an inversed navbar and a black color in a default navbar) Try it Navbar <td>01 Used on a <tr>85 container that contains the list items with links inside a navigation bar Try it Navbar <td>03 Aligns nav links, forms, buttons, or text in the navbar to the right. Try it Navbar <td>04 Removes left, top and right borders (rounded corners) from the navbar (default navbar has a gray border and a 4px border-radius by default) Try it Navbar <td>05 Vertical align any elements inside the navbar that are not links (ensures proper padding) Try it Navbar <td>06 Styles the button that should open the navbar on small screens. Often used together with three <tr>15 classes to indicate a toggleable menu icon (hamburger/bars) Try it Navbar <td>08 Used in the carousel control to identity the next control Try it Carousel <td>08 Used to align pager buttons to the right side of the page (next button) Try it Pager <td>10 Adds a horizontal line under the heading (+ adds some extra space around the element) Try it Page Header <td>11 Creates previous/next buttons (used on <tr>85 elements) Try it Pager <td>13 Creates a pagination (Useful when you have a web site with lots of pages. Used on <tr>85 elements) Try it Pagination <td>15 Large pagination (each pagination link gets a font-size of 18px. Default is 14px) Try it Pagination <td>16 Small pagination (each pagination link gets a font-size of 12px. Default is 14px) Try it Pagination <td>17 Creates a bordered box with some padding around its content Try it Panels <td>18 Container for content inside the panel Try it Panels <td>19 Collapsible panel (toggle between hiding and showing panel(s)) Try it Collapse <td>20 Red panel. Indicates danger Try it Panels <td>21 Light-blue panel. Indicates information Try it Panels <td>22 Green panel. Indicates success Try it Panels <td>23 Yellow panel. Indicates warning Try it Panels <td>24 Creates a panel footer (light background color) Try it Panels <td>25 Used to group many panels together. This removes the bottom margin below each panel Try it Panels <td>26 Creates a panel header (light background color) Try it Panels <td>27 Used inside a <td>26 to adjust the styling of the text (removes margins and adds a font-size of 16px) Try it Panels <td>29 Popup-box that appears when the user clicks on an element Try it Popover <td>30 Makes a <td>31 element scrollable (<td>32 of 350px and provide a y-axis scrollbar) Try it Helpers <td>33 Used in carousels to indicate a "previous" link Try it Carousel <td>34 Used to align pager buttons to the left side of the page (previous button) Try it Pager <td>35 Container for progress bars Try it Progress Bars <td>36 Creates a progress bar Try it Progress Bars <td>37 Red progress bar. Indicates danger Try it Progress Bars <td>38 Light-blue progress bar. Indicates information Try it Progress Bars <td>39 Creates a striped progress bar Try it Progress Bars <td>40 Green progress bar. Indicates success Try it Progress Bars <td>41 Yellow progress bar. Indicates warning Try it Progress Bars <td>42 Float an element to the left Try it Helpers <td>43 Float an element to the right Try it Helpers <td>44 Used to identify the right carousel control Try it Carousel <td>45 Container for responsive columns Try it Grid <td>46 Removes the gutters from a row and its columns Try it Grid <td>47 Shows an element (<td>48 Try it Helpers <td>49 Creates a lighter, secondary text in any heading Try it Typography <td>50 Hides an element on all devices except for screen readers Try it Helpers <td>51 Hides an element on all devices except for screen readers Try it Helpers <td>52 Adds a green background color to a table row (<tr> or table cell (<td>). Indicates success or a positive action Try it Tables <td>55 Used together with <td>56 to creates toggleable/dynamic tabs/pills Try it Tabs <td>56 Used together with <td>55 to creates toggleable/dynamic tabs/pills Try it Tabs <td>59 Adds basic styling to a table (padding, bottom borders, etc) Try it Tables <td>60 Adds borders on all sides of the table and cells Try it Tables <td>61 Makes a table more compact by cutting cell padding in half Try it Tables <td>62 Creates a hoverable table (adds a grey background color on table rows on hover) Try it Tables <td>63 Makes a table responsive (adds a horizontal scrollbar when needed) Try it Tables <td>64 Indicates capitalized text Try it Typography <td>65 Center-aligns text Try it Typography <td>66 Red text color. Indicates danger Try it Typography <td>67 Hides text (helps replace an element's text content with a background image) Try it Typography <td>68 Light-blue text color. Indicates information Try it Typography <td>69 Indicates justified text Try it Typography <td>70 Aligns the text to the left Try it Typography <td>71 Changes text to lowercase Try it Typography <td>72 Grey text color Try it Typography <td>73 Prevents the text from wrapping Try it Typography <td>74 Blue text color Try it Typography <td>75 Aligns text to the right Try it Typography <td>76 Green text color. Indicates success Try it Typography <td>77 Makes text uppercase Try it Typography <td>78 Yellow/orange text color. Indicates warning Try it Typography .active5 Adds a border around an element (often images or videos) to make it look like a thumbnail Try it Images <td>80 Popup-box that appears when the user moves the mouse pointer over an element Try it Tooltip <td>81 Deprecated as of v3.2.0. Used to show and/or hide content by device. Note: Use <tr>11 instead Try it Helpers <td>83 Displays the element (.active3) in print (pre)view Helpers <td>85 Displays the element (<td>86) in print (pre)view Helpers <td>87 Displays the element (<td>88) in print (pre)view Helpers <td>89 Hides the element (<tr>10) in print (pre)view Helpers <td>91 Adds a yellow background color to the table row (<tr> or table cell (<td>). Indicates a warning Try it Tables <td>94 Adds a rounded border around an element with a gray background color and some padding Try it Wells <td>95 Large well (more padding) Try it Wells <td>96 Small well (less padding) Try it Wells

Có bao nhiêu lớp bootstrap có?

Lưới của Bootstrap bao gồm sáu tầng của các lớp được xác định trước để xây dựng bố cục đáp ứng phức tạp.Tùy chỉnh kích thước của các cột của bạn trên các thiết bị cực nhỏ, nhỏ, trung bình, lớn hoặc cực lớn tuy nhiên bạn thấy phù hợp.six tiers of predefined classes for building complex responsive layouts. Customize the size of your columns on extra small, small, medium, large, or extra large devices however you see fit.

Các lớp bootstrap là gì?

Danh sách đầy đủ của tất cả các lớp bootstrap.

Div có thể có bao nhiêu lớp?

Vâng, Div có thể tham gia nhiều lớp như bạn cần.Sử dụng không gian để tách cái này với cái khác.as many classes as you need. Use space to separate one from another.

Bootstrap 3 hay 4 có tốt hơn không?

Bootstrap 3 đã sử dụng phao để xử lý bố cục không giống như Flexbox trong Bootstrap 4. Bố cục hộp linh hoạt giúp thiết kế cấu trúc bố cục phản hồi linh hoạt dễ dàng hơn mà không cần sử dụng phao hoặc định vị.Mặc dù nó có các tính năng đáp ứng, với CSS tùy chỉnh, việc triển khai đã trở nên phức tạp với Bootstrap 4. used floats to handle the layout unlike flexbox in Bootstrap 4. The Flexible Box Layout makes it easier to design flexible responsive layout structure without using float or positioning. Although it has responsive features, with custom CSS the implementation has become complex with Bootstrap 4.