input

问题 Hello I am new user to Python - Could somebody help me understand why i cant seem to declare this global variable col_number. I want to try and use the col_number to pass it to the plotting function. Ive tried declaring it as a global variable but I am just guessing now - not really sure how to fix this. Thanks from matplotlib import style from matplotlib import pyplot as plt import numpy as np import csv # import random used for changing line colors in chart import random from itertools

问题 I am new on learning HTMl coding, and I wanted to train my self by rproducing the https://www.google.com/ page. Thus, I've added inputs to let the user making is researches. There are two different types of reshearches I want to provide (jus as like in the Google's page). In the first one, by clicking on the "Google Search" submit input, the user is doing a classic research. While in the second one, when the user clicks on the "I'm Feeling Lucky" submit input, the user is directly taken to

问题 This works fine if I sum numbers in JavaScript in an Array. But when I ask their input from User then they are printed as if the numbers are in string. Kindly help me in finding the flaw in my code. var tArr = []; for(var f = 1;f<=4;f++) { // tArr.push(f); var z = prompt("Enter numbers for Sum"); tArr.push(z); } var r = parseInt(tArr); alert(tArr); var summ = 0; for(var w = 0; w< tArr.length; w++) { summ += tArr[w]; } console.log(summ); 回答1: To convert all values to number just do +tArr[w]

问题 I have created a select input field with dropdown using javascript so user can add multiple entries but the javascript does not pull in the php function used to create the select dropdown values. I am unable to see why the dropdown does not work. The dropdown does work correctly if i create the input field using php. Javascript <script> var count = 0; $(document).ready(function(){ $(document).on('click', '.add', function(){ var html = ''; html += '<label for="category" class="col-sm-4 control

问题 my question is how to display the selected file image from the input file in img tag, I have described the code below. <img src="" width="200" height="100"> <input type="file" name="logo" id="upload-logo" /> $('#upload-logo').on('change', function(){ let logo = $(this).val(); $('img').attr('src', logo); }); but the result I got after changing the src attribute is: Not allowed to load local resource: file: /// C: /fakepath/Capture.PNG, and photos are not displayed I do not want to use ajax 回答1

问题 I am new to java. Trying to make this into a user input 2D array which is 4*4. But when I try scanner, the row and col always got messed up. public static void main(String[] args) { String array = "1 2 2 1,1 3 3 1,1 3 3 2,2 2 2 2"; int[][] input = parseInt(array, 4, 4); } And I also want the user input can output as: 1 2 2 1 1 3 3 1 1 3 3 2 2 2 2 2 Appreciate for everybody's help! 回答1: Try this one : public static void main(String args[]) { String array = "1 2 2 1,1 3 3 1,1 3 3 2,2 2 2 2";

问题 How do I remove the value 'Anonymous' in this input that I have and replace it with a placeholder text 'Your name' using javascript/jquery? I don't have access to the HTML code. This is what I have so far, but don't really know where to go from there. document.getElementById('txtYourName').placeholder =' Your Name '; HTML <input id="txtYourName" type="text" value="Anonymous" name="txtYourName"></input> 回答1: Add this second line here... A placeholder is only seen when the value happens to be

问题 I have a Sudoku puzzle and I want to make it so the user can press the shift key and hold it down while they use the arrow keys to move up and down between cells. The cells that are already set are <input> tags like the rest, but they have the readonly attribute. Each cell has a class of 'puzzle_cells' and an id starting with a 'c' followed directly by the row number they are in, a '-', and then the cell number. So, the third cell down, fifth from the left would have an id of 'c3-5'. Every

问题 I have a form where the inputs values are controlled by range sliders. There's a calculation every time there's a new entry on each input which operates on focusout. Though, the calculation doesn't work when only the range sliders are used. Is there a way to focus the inputs while using the range sliders? I can't change the way of calculation, because, it's on all the inputs. So, it has to be this way. My form is bigger, but, here's an example of what I have: <label class="va1">Option a price

问题 I want to read user inputs from a C# console application targeting .NET Core 3.1. In some situations, the user shall have the choice to cancel the input and the related operation by pressing the Escape key at any point of time when the user is prompted for input. The following script works for empty strings (user just hit Enter and nothing else), and normal user input (user enters characters and confirms with Enter ). But there is a issue: When the user cancels the input (hits Escape ), the