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Set the disabled property to true in jQuery −ExampleFollowing is the code − Document $("#change").click(function (buttonEvent) { buttonEvent.preventDefault(); $('#showTxtBoxHide').prop("disabled", false); }); To run the above program, save the file name anyName.html(index.html). Right click on the file and select the option “Open with live server” in VS Code editor −OutputThe output is as follows −The text box property is disabled. To enable, you need to click the button −
Let’s say the following is our input type with value, “John Smith” −To change, use the attr() method −$('#changeTheName').attr('value', 'Please enter your name.......');You need to use the concept of attr(). Following is the code −Example Document $('#changeTheName').attr('value', 'Please enter your name.......'); To run the above program, save the file name “anyName.html(index.html)” and right click on the file. Select the option “Open with Live Server” in VS Code editor.OutputThis will produce the following output −
To implicitly mimic click(), you can call a function internally.ExampleFollowing is the code to implicitly mimic click − Document My Name is John Doe demo1Data = document.getElementById('demo1').innerHTML demo1Data = demo1Data.replace('My Name is John Doe', `My Favourite Subject is JavaScript..`) document.getElementById('demo2').innerHTML = demo1Data function replaceData() { document.getElementById('output').innerHTML = 'I live is US.'; } document.getElementById('demo2').querySelector('span').click(); To run the above program, save the file name anyName.html (index.html). Right click on the file and select the ... Read More
Subsetting can be required in many different ways, we can say that there might be infinite number of ways for subsetting as it depends on the objective of the bigger or smaller analysis. One such way is subsetting a matrix based on a certain value of column of the matrix. In R, we can easily do the same with the help of subset function as shown in below example.ExampleM3)Output [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [1,] 4 14 24 34 44 54 64 74 84 94 [2,] 5 15 25 35 45 55 65 75 85 95 [3,] 6 16 26 36 46 56 66 76 86 96 [4,] 7 17 27 37 47 57 67 77 87 97 [5,] 8 18 28 38 48 58 68 78 88 98 [6,] 9 19 29 39 49 59 69 79 89 99 [7,] 10 20 30 40 50 60 70 80 90 100Examplesubset(M,M[,1]75)Output[,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [1,] 6 16 26 36 46 56 66 76 86 96 [2,] 7 17 27 37 47 57 67 77 87 97 [3,] 8 18 28 38 48 58 68 78 88 98 [4,] 9 19 29 39 49 59 69 79 89 99 [5,] 10 20 30 40 50 60 70 80 90 100Examplesubset(M,M[,9]>81)Output[,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [1,] 2 12 22 32 42 52 62 72 82 92 [2,] 3 13 23 33 43 53 63 73 83 93 [3,] 4 14 24 34 44 54 64 74 84 94 [4,] 5 15 25 35 45 55 65 75 85 95 [5,] 6 16 26 36 46 56 66 76 86 96 [6,] 7 17 27 37 47 57 67 77 87 97 [7,] 8 18 28 38 48 58 68 78 88 98 [8,] 9 19 29 39 49 59 69 79 89 99 [9,] 10 20 30 40 50 60 70 80 90 100Examplesubset(M,M[,9]
The default graph created by using ggplot2 package shows the axes labels depending on the starting and ending values of the column of the data frame or vector but we might want to visualize it just like we do in paper form of graphs that shows all of the four quadrants. This can be done by using xlim, ylim, geom_hline, and geom_vline functions with ggplot function of ggplot2 package.Consider the below data frame −Examplex
To toggle content, use slideToggle() in JavaScript.ExampleFollowing is the code: − Document .firstDiv { display: none; } .txtBox { display: block; } Press Me to toggle the text box Enter your name: function toogleTheTextBox() { $('#firstDiv').slideToggle(function () { $('#txtBox').focus(); }); } To run the above program, save the file name anyName.html (index.html). Right click on the file and select the option “Open with Live Server” in VS Code editor.OutputThe output is as follows −Press the button “Press Me” to toggle the text box.OutputThe output is as follows −
For this, use jQuery(selector).toolTip().ExampleFollowing is the code: − Document Write Your Favourite Subject Name: jQuery(".demoTooltip").toolTip() To run the above program, save the file name anyName.html (index.html). Right click on the file and select the option “Open with Live Server” in VS Code editor.OutputThe output is as follows −When you will hover the mouse inside the text box, you will get your tooltip −Your Favourite Subject may be JavaScript...Displayed in the below screenshot as well −
To count how many times a user presses the button, you need to set counter on button click.ExampleFollowing is the code − Document Press Me The current Value is= 0 var increment = 0; var current = document.getElementById('incrementThisValue'); document.getElementById('pressButton').onclick = (event) => { current.textContent = ++increment; }; To run the above program, save the file name anyName.html (index.html). Right click on the file and select the option “Open with Live Server” in VS Code editor.OutputThe output is as follows −When you press the button you will get an incremental value which starts from 0,1,2,...NOutputThe output is as follows −
To make checkboxes impossible to check, set disabled property to true −JavaScriptFollowing is the code −ExampleFollowing is the code − Document List Of Subject names MySQL JavaScript MongoDB To run the above program, save the file name anyName.html (index.html). Right click on the file and select the option “Open with Live Server” in VS Code editor.OutputThe output is as follows −You cannot check the checkbox value above since we have disabled it.
Sometimes the data frame is filled with too many missing values/ NA’s and each column of the data frame contains at least one NA. In this case, we might want to find out how many missing values exists in each of the columns. Therefore, we can use colSums function along with is.na in the following manner: colSums(is.na(df)) #here df refers to data frame name.Consider the below data frame −Exampleset.seed(109) x1