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Efficient and Helpful JavaScript/jQuery Tips and Tricks  

Submit day 11/10/2010 You do not write comment in this script 1

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Efficient and Helpful JavaScript/jQuery Tips and Tricks This free HTML JavaScript tutorial provides 45+ JavaScript/jQuery tips and tricks that help you work in JavaScript tasks better, through live HTML JavaScript example codes. List of some JavaScript tips and tricks:

- Refreshing the src of an image with jQuery?
- Check if an image is loaded or not with jQuery
- Remove selected text after mouse double click JavaScript event
- Validate an email address
- Check if an HTML control element exists
- Cancel an AJAX request
- Select all HTML checkboxes
- Selecting root element of a certain level in the document
- Searching a string in jQuery

Please go to the full post page for full detailed tips and HTML JavaScript example codes, then try some JavaScript tutorials:

- 10 Small Javascript Tricks You Should Master
- Some Basic Tips and Tricks for Speeding Up JavaScript
- 10 jQuery and JavaScript Tips and Tricks to Improve Your Code
- 5 Good and Small JavaScript Tips and Tricks


Label: JavaScript event, HTML control, HTML JavaScript example code, 45

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  • How to refresh the src of an image with jQuery?
    • view sourceprint?
    1.$(imageobj).attr('src', $(imageobj)
    2.           .attr('src') + '?' + Math.random() );
  • How to see if an image is loaded or not with jquery
    • view sourceprint?
    1.var imgsrc = 'img/image1.png';
    2.$('<img/>').load(function () {
    3.    alert('image loaded');
    4.}).error(function () {
    5.    alert('error loading image');
    6.}).attr('src', imgsrc);
  • And if a set (example : 10 images) of images are loaded
    • view sourceprint?
    1.var totalimages  = 10;
    2.var loadedimages = 0;
    3.$("<img/>").load(function() {
    4.    ++loadedimages;
    5.    if(loadedimages == totalimages){
    6.        //All 10 images are loaded
    7.    }
    8.});
  • How to remove selected text after mouse double click event
    • view sourceprint?
    01.clearSelection      : function () {
    02.    if(document.selection && document.selection.empty) {
    03.        document.selection.empty();
    04.    } else if(window.getSelection) {
    05.        var sel = window.getSelection();
    06.        sel.removeAllRanges();
    07.    }
    08.}
    09.$(element).bind('dblclick',function(event){
    10.    //do something
    11.    clearSelection();
    12.});
  • Validate email address:
    • view sourceprint?
    1.var email = 'info@tympanus.net'
    2.if(!(/^((([a-z]|\d|[!#\$%&'\*\+\-\/=\?\^_`{\|}~]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])+(\.([a-z]|\d|[!#\$%&'\*\+\-\/=\?\^_`{\|}~]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])+)*)|((\x22)((((\x20|\x09)*(\x0d\x0a))?(\x20|\x09)+)?(([\x01-\x08\x0b\x0c\x0e-\x1f\x7f]|\x21|[\x23-\x5b]|[\x5d-\x7e]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(\\([\x01-\x09\x0b\x0c\x0d-\x7f]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]))))*(((\x20|\x09)*(\x0d\x0a))?(\x20|\x09)+)?(\x22)))@((([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])*([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])))\.)+(([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])*([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])))\.?$/i.test(email)))
    3.alert('Invalid Email');
  • How to order a <ul> element using jQuery
    • view sourceprint?
    01.<ul>
    02.<li>cloud</li>
    03.<li>sun</li>
    04.<li>rain</li>
    05.<li>snow</li>
    06.</ul
    07. 
    08.var items = $('.to_order li').get();
    09.items.sort(function(a,b){
    10.    var keyA = $(a).text();
    11.    var keyB = $(b).text();
    12. 
    13.    if (keyA < keyB) return -1;
    14.    if (keyA > keyB) return 1;
    15.    return 0;
    16.});
    17.var ul = $('.to_order');
    18.$.each(items, function(i, li){
    19.    ul.append(li);
    20.});
  • Passing parameters to a function called with setTimeout
    • view sourceprint?
    1.timeout = setTimeout(function(){myFunction(param)},time);
  • Disable right mouse click
    • view sourceprint?
    1.$(document).ready(function(){
    2.    $(document).bind("contextmenu",function(e){
    3.        return false;
    4.    });
    5.});
  • Fade out an image, and fade in another one (replacing the previous one)
    • view sourceprint?
    1.$('imageelement').fadeOut(function() {
    2.    $(this).load(function() {
    3.        $(this).fadeIn();
    4.    }).attr('src', AnotherSource);
    5.});
  • Write your own selectors
    • view sourceprint?
    01.//extend the jQuery functionality
    02.$.extend($.expr[':'], {
    03. 
    04.    //name of your special selector
    05.    moreThanAThousand : function (a){
    06.        //Matching element
    07.        return parseInt($(a).html()) > 1000;
    08.    }
    09.});
    10. 
    11.$(document).ready(function() {
    12.    $('td:moreThanAThousand').css('background-color', '#ff0000');
    13.});
    by mua sam vui, 05/05/2011 07:05 PM
    Jquery is great     Reply
    so great , jquery is the big library javascript for all people to apply !
    Thanks CaoPhong ...
    by Preview
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