Given an HTML document and the task is to identify whether a particular element has scrollBars or not. There are two approaches to solve this problem which are discussed below:
Approach 1:
- Select the particular element.
- Get the element.scrollWidth and .clientWidth property for horizontal scrollbar.
- Calculate the scrollWidth>clientWidth.
- If the value comes true then horizontal scrollbar is present else not.
- Do the same process to check vertical scrollbar.
Example 1: This example implements the above approach.
<!DOCTYPE HTML> <html> <head> <title> Check whether HTML element has scrollbars using JavaScript </title> <style> #div { width:200px; height:150px; overflow:auto; text-align:justify; } #GFG { font-size: 24px; font-weight: bold; color: green; } </style> </head> <body> <center> <h1 style = "color:green;" > neveropen </h1> <h3> Click on the button to check for the scrollBars </h3> <div id="div"> This course is for all those people who want to learn Data Structures and Algorithm from basic to advance level. We don't expect you to have any prior knowledge on Data Structure and Algorithm, but a basic prior knowledge of any programming language ( C++ / Java) will be helpful. This course gives you the flexibility of learning, under this program you can study your course whenever you feel like, you need not hurry or puzzle yourself. </div> <br> <button onclick = "GFG_Fun()"> Click Here! </button> <div id = "GFG"></div> <script> function GFG_Fun() { var div = document.getElementById('div'); var hs = div.scrollWidth > div.clientWidth; var vs = div.scrollHeight > div.clientHeight; document.getElementById('GFG').innerHTML = "Horizontal Scrollbar - " + hs +"<br>Vertical Scrollbar - " + vs; } </script> </center> </body> </html> |
Output:
- Before clicking on the button:
- After clicking on the button:
Approach 2:
- Select the particular element.
- Use the scrollTop and scrollLeft properties.
- If these are greater than 0, scrollbars are present.
- If these are 0, then first set them to 1, and test again to know if getting a result of 1.
- Finally, set them back to 0.
Example 2: This example using the approach discussed above.
<!DOCTYPE HTML> <html> <head> <title> Check whether HTML element has scrollbars using JavaScript </title> <style> #div { width:200px; height:200px; overflow:none; text-align:justify; } #GFG { font-size: 24px; font-weight: bold; color: green; } </style> </head> <body> <center> <h1 style = "color:green;" > neveropen </h1> <h3> Click on the button to check for the scrollBars </h3> <div id="div"> This course is for all those people who want to learn Data Structures and Algorithm from basic to advance level. We don't expect you to have any prior knowledge on Data Structure and Algorithm, but a basic prior knowledge of any programming language ( C++ / Java) will be helpful. </div> <br> <button onclick = "GFG_Fun()"> Click Here! </button> <div id = "GFG"></div> <script> function checkScrollBar(element, dir) { dir = (dir === 'vertical') ? 'scrollTop' : 'scrollLeft'; var res = !! element[dir]; if (!res) { element[dir] = 1; res = !!element[dir]; element[dir] = 0; } return res; } function GFG_Fun() { var div = document.getElementById('div'); var hs = checkScrollBar(div, 'horizontal'); var vs = checkScrollBar(div, 'vertical'); document.getElementById('GFG').innerHTML = "Horizontal Scrollbar - " + hs +"<br>Vertical Scrollbar - " + vs; } </script> </center> </body> </html> |
Output:
- Before clicking on the button:
- After clicking on the button:
