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Articles on Trending Technologies
Technical articles with clear explanations and examples
How to hide table rows containing zero value with jQuery?
Let’s say the following is our table with product quantity records − qty: qty: qty: qty: Let us now hide using the hide() method. Following is the code −Example Document qty: qty: qty: qty: $('.hideRowContainingZeroValue input').filter(function(){ return +this.value === 0; }).closest("tr").hide() 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 −
Read MoreHow to find contingency table of means from an R data frame using cast function?
The contingency table considers the numerical values for two categorical variables. Often, we require contingency table for counts, especially in non-parametric analysis but it is also possible that we want to use means for our analysis. Hence, we can use cast function from reshape package which solves the problem of creating contingency table easily.Consider the below data frame −Exampleset.seed(99) x1
Read MoreList View Search list on typing with filter like keyword search using jQuery?
Let’s the following is our input type, wherein the user will search −Now, use hide() and show() to display only relevant search and hide rest. For example, on typing “Ja”, related keywords like “Java” and “JavaScript” should be visible because it begins with “Ja”.Example Document Enter the keyword.. JavaScript John Smith Java David Miller -1) { $(this).show(); $(this).prev('.subjectName').last().show(); } else { $(this).hide(); ...
Read MoreHow to subset an R data frame based on string values of a columns with OR condition?
We might want to create a subset of an R data frame using one or more values of a particular column. For example, suppose we have a data frame df that contain columns C1, C2, C3, C4, and C5 and each of these columns contain values from A to Z. If we want to select rows using values A or B in column C1 then it can be done as df[df$C1=="A"|df$C1=="B",].Consider the below data frame −Exampleset.seed(99) x1
Read MoreHow do you remove all the options of a select box and then add one option and select it with jQuery?
To remove, use remove() and append() to add option in already created select list. Let’s say the following is our select − JavaScript MySQL ExampleFollowing is the code to remove all the options and add a new one − Document JavaScript MySQL $('#demo') .find('option') .remove() .end() .append('MongoDB') .val('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 −
Read MoreFetch value from Alert pop up in jQuery
To fetch value from alert pop up, use alert(). At first, use prompt() to input the value from user. Following is the code −Example Document var value = prompt("Please enter an integer value"); var multiplyBy10=10*value; alert("Result after multiplying by 10 = "+ multiplyBy10); 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 −Put an integer value and click the OK button.After clicking the OK button, the snapshot is as follows −
Read MoreHow to create a transparent polygon using ggplot2 in R?
A transparent polygon just represents the border lines and a hollow area; thus, we can only understand the area covered but it becomes a little difficult to understand the scales. Hence, this visualisation technique is not as useful as others that fills the area with a different color. But it could be used if the range of the data is not large.Consider the below data frame −Exampleset.seed(123) x
Read MoreHow to find the proportion of row values in an R data frame?
The proportion of row values can be calculated if we divide each row value with the sum of all values in a particular row. Therefore, the total sum of proportions will be equal to 1. This can be done by dividing the data frame with the row sums and for this purpose we can use the below syntax −Syntaxdata_frame_name/rowSums(data_frame_name)Consider the below data frame −Exampleset.seed(111) x1
Read MoreHow to plot all the values of an R data frame?
To plot all the values of an R data frame, we can use matplot function. This function plots all the values based on the columns of an R data frame and represent them by the column number. For example, if we have five columns in an R data frame then matplot will represent the first column by 1, second column by 2, third column by 3 and so on.Consider the below data frame −Exampleset.seed(555) v1
Read MoreHow to split string values that contain special characters in R?
When we have a single long string or a vector of string values and the values within the string are separated by some special characters then splitting the values can help us to properly understand those strings. This could happen in situations when the string data is recorded with mistakes or have some other purpose. We can do the splitting using strsplit function.Examplex1
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