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Found 12 results

  1. Hello, to my experience the following does not work (tryit-editor w3School), but it does with a "while" loop instead. Are "for" loops not allowed within classes? <p id="demo">result</p> class Test{ counter(){ var result=0; for(i=0;i<10;i++){ result++; } return result; } counter2(){ var result=0; while(result<10){ result++; } return result; } } var obj=new Test(); document.getElementById("demo").innerHTML=obj.counter(); //document.getElementById("demo").innerHTML=ob
  2. Hello folks. I am currently learning Python programming. I have created a fill in the blanks quiz game. In this game, the user has to select a level hard, medium, easy. On the basis of teh level selected, the respective question and its answers are passed as parameters into the function, question validation, this function takes user input and sees whether is matches the question and answer input. If it does, then the answer is passed onto the function, traverse. At traverse, the blanks are filled in and the sentence is returned with missing blank filled in. This seems to work well upto filling
  3. I need to create variable names in a loop (part of this seems to be working) and then get 26 of the 39 variables to perform simple math (for example: variable -= 10). Getting the variables recognized as variables, and not text, seems to be the issue. This works properly, it accesses 13 canvases named canvas1 through canvas13: for (i = 1; i < 14; i++) { c = document.getElementById("canvas" + i.toString()); context = c.getContext("2d"); ... } However, when I try to dynamically create canvas names, and dynamically create 2 variables
  4. I'm baffled by this - I am trying to master for loops and I seem to have run into a snag. I looked up w3's nested for loops and got an example ( you can find it @ javascript statements and click on the 'for' link - at the bottom of the page) and it works great and I understand it . Then I tried to inject an 'if' statement to interrupt it on a condition, but I got some unexpected results and I can't see what is wrong. The logic seems correct - maybe someone can help me. The 1st listing is directly from the example and in the second listing I injected a 2 line if statement - I got the resul
  5. I do not get the input value x to add to i in the for loop. What am I doing wrong? <!DOCTYPE html> <html> <body> <input id="inp" type="number" > </input> <button type="button" onclick=myFunction() > click</button> <p id="result" > </p> <script> function myFunction(){ var txt= ""; res = document.getElementById("result"); res.innerHTML=""; var x= document.getElementById("inp").value; var i= 0; for ( ; i < 20; i++) { txt += "input" + i + "<br
  6. Greetings! I do not understand why I have to describe that variable " ". http://www.w3schools.com/js/tryit.asp?filename=tryjs_loop_for_ex When I put a letter in it, it returns "aThe number is 0 (...)" only the first character, not every loop. So why we need to describe empty value. Why we want to write there nothing ->
  7. j.silver

    Vague Notice

    Hi, This block code is from W3schools tutorials: <?php $cars = array("Volvo", "BMW", "Toyota"); $arrlength = count($cars); for($x = 0; $x <= $arrlength; $x++) { echo $cars[$x]; echo "<br>"; } ?> The original block was without the equal sign in $x <= $arrlength; I have added the equal sign to see what would happen. I got the same result but followed with: Notice: Undefined offset: 3 in C:\xampp\htdocs\Testing\testing.php on line 14 I would appreciate it if someone would explain why I am getting this notice and its meaning. I thought the loop will stop and giv
  8. Hello, Can anyone tell me how I create a for loop which incurs a sentence of 10 pixels to 100 pixels? So the word sentence font-size from 10 to 100 px. for ($x = "sentence"; $x "font-size" ; $xxx) { echo "$x <br>";} thanks in advance.
  9. Hi, I just started to study javascript and I came across in one of your page to the following notation: var text=""; The page is from w3school tutorial: http://www.w3schools.com/js/tryit.asp?filename=tryjs_loop_for_ex I do not understand what it means and why should be used in the loop of the above example. I tried to define var text; in its place but the result is: undefinedThe number is 0The number is 1The number is 2The number is 3The number is 4 The only difference is the world 'undefined' at the beginning of the first line. Many thanks in advance for your help
  10. In the For Loop tutorial of w3si did'nt understand some code line of the following js code, i indicated it below ------------------------------------------------------------------------------------------------------------------------<button onclick="myFunction()">Try it</button><p id="demo"></p> <script>function myFunction(){var x="",i; <---[ what this type of var means, and wat this "" means, ]for (i=0;i<5;i++) { x=x + "The number is " + i + "<br>"; <---[ What the x=x means] }document.getElementById("demo").innerHTML=x;}</script>------
  11. Hi All,I am a newbe in javascript but curious to learn javascript. I have made a table using divs by javascript for loop and want to add diffrent content in diffrent divs. for example: first div should contain an image, second one should contain an paragraph, third one should contain a button element etc, but I don't know how this to be done.so please anyone help me to make me aware of this idea. here is my code. <style type="text/css">.parent { width: 1010px; height: auto; border: 1px solid red; margin: 0 auto; clear: both; display: table;}.child{ width: 200px; h
  12. jimfog

    for loop within...

    Is it valid to have a for loop within a for loop? I tried is and the browser loops endless, if i do not close the browser tab it will not stop looping. So, do you think that by definition is invalid or that it is sth else that causes the above problem?
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