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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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Run a function 5 times with intervals of 20 seconds

var count = 0;
function myFunction() {
    count++;
    if(count > 5) clearInterval(timeout);
    //do something
}
var timeout = setInterval(myFunction, 20000);

Check if an element exists

if ($("#elementid").length) {
    //it does!
}

Cancel an ajax request

var req = $.ajax({
type:     "POST",
url:     "someurl",
data:     "id=1",
success: function(){
//something
}
});
//Cancel the Ajax Request
req.abort()

Check if cookies are enabled

$(document).ready(function() {
    var dt = new Date();
    dt.setSeconds(dt.getSeconds() + 60);
    document.cookie = "cookietest=1; expires=" + dt.toGMTString();
    var cookiesEnabled = document.cookie.indexOf("cookietest=") != -1;
    if(!cookiesEnabled){
        //cookies are not enabled
    }
});

Toggle all checkboxes

var tog = false; // or true if they are checked on load
$('a').click(function() {
    $("input[type=checkbox]").attr("checked",!tog);
    tog = !tog;
});

Get the index of an element

$("ul > li").click(function () {
    var index = $(this).prevAll().length;
});

Validate date of birth

$("#lda-form").submit(function(){
    var day = $("#day").val();
    var month = $("#month").val();
    var year = $("#year").val();
    var age = 18;
    var mydate = new Date();
    mydate.setFullYear(year, month-1, day);
 
    var currdate = new Date();
    currdate.setFullYear(currdate.getFullYear() - age);
    if ((currdate - mydate) < 0){
        alert("Sorry, only persons over the age of " + age + " may enter this site");
        return false;
    }
    return true;
});

Test if an element is visible

if($(element).is(":visible")) {
    //The element is Visible
}

Counting child elements

<div id="foo">
<div id="bar"></div>
<div id="baz">
<div id="biz">
</div>
<span><span>
</div>
 
//jQuery code to count child elements
$("#foo > div").length

Center an element on the screen

jQuery.fn.center = function () {
    this.css("position","absolute");
    this.css("top", ( $(window).height() - this.height() ) / 2+$(window).scrollTop() + "px");
    this.css("left", ( $(window).width() - this.width() ) / 2+$(window).scrollLeft() + "px");
    return this;
}
 
//Use the above function as:
$(element).center();

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Efficient and Helpful JavaScript/jQuery Tips and Tricks - Page 2/en//vi//vi//fr//en//fr//en//fr//en//vi/

0/5 0 votes / 113,846 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

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