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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?

1.$(imageobj).attr('src', $(imageobj)

2. .attr('src') + '?' + Math.random() );

How to see if an image is loaded or not with jquery

var imgsrc = 'img/image1.png';
$('<img/>').load(function () {
    alert('image loaded');
}).error(function () {
    alert('error loading image');
}).attr('src', imgsrc);

And if a set (example : 10 images) of images are loaded

var totalimages  = 10;
var loadedimages = 0;
$("<img/>").load(function() {
    ++loadedimages;
    if(loadedimages == totalimages){
        //All 10 images are loaded
    }
});

How to remove selected text after mouse double click event

clearSelection      : function () {
    if(document.selection && document.selection.empty) {
        document.selection.empty();
    } else if(window.getSelection) {
        var sel = window.getSelection();
        sel.removeAllRanges();
    }
}
$(element).bind('dblclick',function(event){
    //do something
    clearSelection();
});

Validate email address:

var email = '[email protected]'
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)))
alert('Invalid Email');

How to order a <ul> element using jQuery

<ul>
<li>cloud</li>
<li>sun</li>
<li>rain</li>
<li>snow</li>
</ul
 
var items = $('.to_order li').get();
items.sort(function(a,b){
    var keyA = $(a).text();
    var keyB = $(b).text();
 
    if (keyA < keyB) return -1;
    if (keyA > keyB) return 1;
    return 0;
});
var ul = $('.to_order');
$.each(items, function(i, li){
    ul.append(li);
});

Passing parameters to a function called with setTimeout

1.timeout = setTimeout(function(){myFunction(param)},time);

Disable right mouse click

$(document).ready(function(){
    $(document).bind("contextmenu",function(e){
        return false;
    });
});

Fade out an image, and fade in another one (replacing the previous one)

$('imageelement').fadeOut(function() {
    $(this).load(function() {
        $(this).fadeIn();
    }).attr('src', AnotherSource);
});

Write your own selectors

//extend the jQuery functionality
$.extend($.expr[':'], {
 
    //name of your special selector
    moreThanAThousand : function (a){
        //Matching element
        return parseInt($(a).html()) > 1000;
    }
});
 
$(document).ready(function() {
    $('td:moreThanAThousand').css('background-color', '#ff0000');
});

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Efficient and Helpful JavaScript/jQuery Tips and Tricks - Language: English

0/5 0 votes / 114,244 previews / 1 comment 11/10/2010 This free HTML JavaScript tutorial provides 45+ JavaScript/jQuery tips and tricks that help you work in JavaScript tasks...Efficient and Helpful JavaScript/jQuery Tips and Tricks - Efficient and Helpful JavaScript/jQuery Tips and Tricks - Language: English

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