JavaScript - jQuery - Ajax

Topics related to client-side programming language.
Post questions and answers about JavaScript, Ajax, or jQuery codes and scripts.

  1. » Marius
    Hello
    How can I shuffle /randomize an array in JavaScript? Is there a JavaScript function like shuffle() in PHP?
    Last post » Admin
    Hi
    You can use this function:
    // receive an array and return it with the items shuffled /randomized
    function shuffle(ar){
    for(var j, x, i =...


  2. » crop
    Hi,
    i read this :

    and i tried to copy it, i made simplified version here:
    clinde.de/dump/crop.html

    - check.php is present, but you can't see...
    Last post » MarPlo
    I replaced the onblur event with onchange . Now, when ALL the input fields are validated, the submit button is enabled and the form is Automatically...


  3. » PloMar
    I have an Ajax function that adds in page some content from server. It was working fine when the page url was with http , but after I put https the...
    Last post » MarPlo
    Hello,
    If the page url is with https , the Ajax request must be made with https . So, make sure you access the file on server with the same protocol...


  4. » PloMar
    I have this JS script:
    <script>
    function blockToggle(type,blockee,elem){
    var conf = confirm( Press OK to confirm the ' +type+ ' action );...
    Last post » MarPlo
    The error message indicates that there is not a HTML element in page with the id passed in the elem arguments.
    Check the part of your JavaScript...


  5. » PloMar
    I have a dropdown select list like this:
    <select name= sel1 id= sel1 >
    <option value= 1 >text 1</option>
    <option value= 2...
    Last post » MarPlo
    Hi,
    You can use the selectedIndex property to get the ordered index of the selected option, then, with that index you can get the object with the...


  6. » PloMar
    Hello
    How can I get the filename and extension from a variale with an URL address in JavaScript?
    The URL can be any kind of webpage address; with...
    Last post » MarPlo
    Hi,
    Just use the getFilename() function from this example:
    <script>
    function getFilename(url){
    // returns an object with {filename, ext}...


  7. » PloMar
    Hello,
    Is it possible to display the content of a Div in full screen window with JavaScript?
    Last post » Admin
    Hi,
    There is fullscreen API in JavaScript, you can use the requestFullscreen() method to display a HTML element in full screen mode, documentation:...


  8. » PloMar
    Hello,
    I have the following code that sends form data with Ajax to a php script. It works, but after the form data is sent, the value added in the...
    Last post » Admin
    Hello,
    You can use the following JavaScript code (in the success section of your Ajax function) when the data have already been sent, to delete...


  9. » PloMar
    Hello
    I have the following code to send form data to a php script, with jQuery Ajax, withouut reloading the page.
    But, when I press the Submit...
    Last post » Admin
    Hi,
    You have to call preventDefault() method to stop default action.
    <script>
    $(document).ready(function(){
    $('#form').submit(function(e) {...


  10. » PloMar
    Hello,
    I want to display a file (image) in canvas before it is uploaded.
    The preview action in canvas should be executed all in the browser without...
    Last post » Admin
    Hi,
    You can use URL.createObjectURL() on the File from your <input> to generate a blob object URL.
    Generated URL will be like:...


  11. » PloMar
    Hello,
    I have a canvas element and a form with a text box and a button. I want to be able to put an image url into the text box, and after click on...
    Last post » Admin
    Hi,
    You can use this script. When click on the button, it adds the image from URL in page (into a Div, #pic1), then, the function addCnvImg() gets...


  12. » PloMar
    Hi,
    I have the following code:
    <img src= image.png alt= Image onclick= test(data) />

    <script>
    function test(prm) {
    alert(prm)...
    Last post » Admin
    Hi,
    If the argument is a string, you should add it between quotes, like this:
    <img src= image.png alt= Image onclick= test('data') />


  13. » PloMar
    Can I make the content of a html div to be editable?
    For example I have the following code:
    <div id= edit1 >Content that can be...
    Last post » MarPlo
    To make the content of a html element to be editable, just add the: contentEditable= true attribute in that tag. It can be used in almost all HTML...


  14. » PloMar
    Hello
    I have an input text field to which i want to display a tooltip with a html table, when the mouse is over the input field.
    How can i make it...
    Last post » Admin
    Hello
    Set position:relative; to the parent container (it is important for absolute position), then set position: absolute; , display: none; and...


  15. » PloMar
    How can I refresh the page after a specified time?
    I have a html table with data from server. These data are changed to every 3 minutes, so I want...
    Last post » MarPlo
    You can use the reload() function added in setTimeout().
    <script>
    // refresh page after 3 min. (true to load from server, not from cache)...


  16. » PloMar
    How can I parse the array items in reverse order, in JavaScript?
    I have a Div and an array with numbers in JS code, like this:
    <div id= dv1...
    Last post » MarPlo
    The simplest way is to use a reverse for() loop (with i-- ).
    See this example:
    <div id= dv1 ></div>
    <script>
    var ary = ;
    var...


  17. » PloMar
    How to add (append) text in textarea using jquery without removing previous text?
    I have this code, but it only works for first time, when i change...
    Last post » MarPlo
    Inside the dom the value and text attributes are stored separately. When you use append the text is appended but the value is blanked because it is...


  18. » PloMar
    Hi
    I'm drawing text in an HTML5 canvas on top of an image. I want to calculate a font size so that the string will span 200 pixels width.
    So...
    Last post » MarPlo
    The fillText() method has an optional fourth argument, which is the max width to render the string.
    - MDN's documentation says:
    maxWidth - the...


  19. » PloMar
    Hello all
    Anyone know how to calculate the number of characters that will fill one line of a div with a fixed width (for example 200px), using...
    Last post » MarPlo
    Hi,
    You can use this formula to get the width of the line for a given number of characters (CPL):
    Width = CPL * (font-size / font-constant)
    - CPL...


  20. » PloMar
    I use this code to animate position of a Div when is hovered. I move it with 2500 animation speed.
    How do I change speed of this animation to 800,...
    Last post » Admin
    Try with the dequeue() function (Execute the next function on the queue for the matched elements).
    <div id= dv >Animate Div</div>...


  21. » PloMar
    Let say I have this html:
    <div id= parent >
    <div id= c1 >Content child 1</div>
    <p id= c2 >Paragraph ...
    <span>some...
    Last post » Admin
    Try with the > selector, it refers to the direct childen.
    1. Example get array with the ID of all direct children.
    <div id= parent >...


  22. » PloMar
    How can I use JavaScript /jQuery to follow the mouse cursor with a DIV in the whole page?
    Last post » Admin
    If you want this effect with pure JavaScript, you can use this code:
    <style>
    #div_moving {
    position: absolute;
    width: 140px;
    height: 65px...


  23. » PloMar
    I'm playing with jQuery. Now I test the trigger() method.
    I try to trigger a custom method and pass two additional arguments (an object and a...
    Last post » Admin
    When you pass multiple arguments with trigger(), and those arguments aren't a number or a string, you should pass all the additional arguments into...


  24. » PloMar
    I have a Select box and options with IDs of the rows from a MySQL table.
    In that form there are 3 text fields.
    Now, when I select an option from...
    Last post » Admin
    To make that script you need to know how to work with JavaScript /Ajax and with data in JSON format.
    1. Register an onchange event to the Select-box...


  25. » PloMar
    I have an object like this in javascript:
    var obj = {
    prop1: 'val 1',
    prop2: 'val 2',
    prop3: 'val 3'
    };
    What is the best way to retrieve a list...
    Last post » Admin
    You can use the built in Object.keys method:
    var obj = {
    prop1: 'val 1',
    prop2: 'val 2',
    prop3: 'val 3'
    };

    var props = Object.keys(obj);...