最近几年来,地理信息系统无论是在理论上还是应用上都处在一个飞速发展的阶段。 GIS被应用于多个领域的建模和决策支持,如城市管理、区划、环境整治等等,地理信息成为信息时代重要的组成部分之一; “数字地球”概念的提出,更进一步推动了作为其技术支撑的GIS的发展。 与此同时,一些学者致力于相关的理论研究,如空间感知、空间数据误差、空间关系的形式化等等。 这恰好说明了地理信息系统作为应用技术和学科的两个方面,并且这两个方面构成了相互促进的发展过程。
Bootstrap 5 allows us to put buttons on the same line.
It can be found in the Tip: we can use the Can be used We can set the drop-down menu in the button group: Button groups can be displayed side by side on the same line: .btn-group class to create a button group. 7.12.1. Example ¶
<div class="btn-group"> <button type="button" class="btn btn-primary">Applebutton> <button type="button" class="btn btn-primary">Samsungbutton> <button type="button" class="btn btn-primary">Sonybutton> div>
.btn-group-lg|sm|xs class to set the size of the button group. 7.12.2. Example ¶
<div class="btn-group btn-group-lg"> <button type="button" class="btn btn-primary">Applebutton> <button type="button" class="btn btn-primary">Samsungbutton> <button type="button" class="btn btn-primary">Sonybutton> div>
Vertical button group ¶
.btn-group-vertical class to create a vertical button group: 7.12.3. Example ¶
<div class="btn-group-vertical"> <button type="button" class="btn btn-primary">Applebutton> <button type="button" class="btn btn-primary">Samsungbutton> <button type="button" class="btn btn-primary">Sonybutton> div>
Built-in button set and drop-down menu ¶
7.12.4. Example ¶
<div class="btn-group"> <button type="button" class="btn btn-primary">Applebutton> <button type="button" class="btn btn-primary">Samsungbutton> <div class="btn-group"> <button type="button" class="btn btn-primary dropdown-toggle" data-bs-toggle="dropdown"> Sony button> <div class="dropdown-menu"> <a class="dropdown-item" href="#">Tableta> <a class="dropdown-item" href="#">Smartphonea> div> div> div>
Vertical button group and drop-down menu ¶
7.12.5. Example ¶
<div class="btn-group-vertical"> <button type="button" class="btn btn-primary">Applebutton> <button type="button" class="btn btn-primary">Samsungbutton> <div class="btn-group"> <button type="button" class="btn btn-primary dropdown-toggle" data-bs-toggle="dropdown">Sonybutton> <ul class="dropdown-menu"> <li><a class="dropdown-item" href="#">Tableta>li> <li><a class="dropdown-item" href="#">Smartphonea>li> ul> div> div>
Multiple button groups ¶
7.12.6. Example ¶
<div class="btn-group"> <button type="button" class="btn btn-primary">Applebutton> <button type="button" class="btn btn-primary">Samsungbutton> <button type="button" class="btn btn-primary">Sonybutton> div> <div class="btn-group"> <button type="button" class="btn btn-primary">BMWbutton> <button type="button" class="btn btn-primary">Mercedesbutton> <button type="button" class="btn btn-primary">Volvobutton> div>