Of Stack

jQuery Practical Skills Required (Part 1)

  • 2020-09-28 08:46:11
  • OfStack

This example summarizes classic and practical jQuery code development tips. Share to everybody for everybody reference. The details are as follows:

1. Right click is prohibited 


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

2. Hide the search text box text
Hide when clicked in the search field, the value.(example can be found below in the comment fields) 


$(document).ready(function() {
$("input.text1").val("Enter your search text here");
 textFill($('input.text1'));
});
 
 function textFill(input){ //input focus text function
 var originalvalue = input.val();
 input.focus( function(){
  if( $.trim(input.val()) == originalvalue ){ input.val(''); }
 });
 input.blur( function(){
  if( $.trim(input.val()) == '' ){ input.val(originalvalue); }
 });
}

Open the link in a new window
XHTML 1.0 Strict doesn't allow this attribute in the code, so use this to keep the code valid. 


$(document).ready(function() {
 //Example 1: Every link will open in a new window
 $('a[href^="http://"]').attr("target", "_blank");
 
 //Example 2: Links with the rel="external" attribute will only open in a new window
 $('a[@rel$='external']').click(function(){
 this.target = "_blank";
 });
});
// how to use
<a href="http://www.jb51.com" rel=external>open link</a>

4. Check your browser
Note: In version jQuery 1.4, $.support replaces the $.browser variable 


$(document).ready(function() {
// Target Firefox 2 and above
if ($.browser.mozilla && $.browser.version >= "1.8" ){
 // do something
}

// Target Safari
if( $.browser.safari ){
 // do something
}

// Target Chrome
if( $.browser.chrome){
 // do something
}

// Target Camino
if( $.browser.camino){
 // do something
}

// Target Opera
if( $.browser.opera){
 // do something
}

// Target IE6 and below
if ($.browser.msie && $.browser.version <= 6 ){
 // do something
}

// Target anything above IE6
if ($.browser.msie && $.browser.version > 6){
 // do something
}
});

5. Pre-load images
This piece of code will prevent the loading of all images, which can be useful if you have a site with lots of images. 


$(document).ready(function() {
jQuery.preloadImages = function()
{
 for(var i = 0; i<ARGUMENTS.LENGTH; jQuery(?<img { i++)>").attr("src", arguments[i]);
 }
}
// how to use
$.preloadImages("image1.jpg");
});

6. Page style switch 


$(document).ready(function() {
 $("a.Styleswitcher").click(function() {
 //swicth the LINK REL attribute with the value in A REL attribute
 $('link[rel=stylesheet]').attr('href' , $(this).attr('rel'));
 });
// how to use
// place this in your header
<LINK rel=stylesheet type=text/css href="default.css">
// the links
<A class=Styleswitcher href="#" rel=default.css>Default Theme</A>
<A class=Styleswitcher href="#" rel=red.css>Red Theme</A>
<A class=Styleswitcher href="#" rel=blue.css>Blue Theme</A>
});

7. The columns are of the same height
If two CSS columns are used, the height of the two columns can be the same in this manner. 


$(document).ready(function() {
function equalHeight(group) {
 tallest = 0;
 group.each(function() {
 thisHeight = $(this).height();
 if(thisHeight > tallest) {
  tallest = thisHeight;
 }
 });
 group.height(tallest);
}
// how to use
$(document).ready(function() {
 equalHeight($(".left"));
 equalHeight($(".right"));
});
});

8. Dynamically control page font size
Users can change the font size of the page 


$(document).ready(function() {
 // Reset the font size(back to default)
 var originalFontSize = $('html').css('font-size');
 $(".resetFont").click(function(){
 $('html').css('font-size', originalFontSize);
 });
 // Increase the font size(bigger font0
 $(".increaseFont").click(function(){
 var currentFontSize = $('html').css('font-size');
 var currentFontSizeNum = parseFloat(currentFontSize, 10);
 var newFontSize = currentFontSizeNum*1.2;
 $('html').css('font-size', newFontSize);
 return false;
 });
 // Decrease the font size(smaller font)
 $(".decreaseFont").click(function(){
 var currentFontSize = $('html').css('font-size');
 var currentFontSizeNum = parseFloat(currentFontSize, 10);
 var newFontSize = currentFontSizeNum*0.8;
 $('html').css('font-size', newFontSize);
 return false;
 });
});

9. Return to the top of the page
For a smooth(animated) ride back to the top(or any location). 


$(document).ready(function() {
$('a[href*=#]').click(function() {
 if (location.pathname.replace(/^\//,'') == this.pathname.replace(/^\//,'')
 && location.hostname == this.hostname) {
 var $target = $(this.hash);
 $target = $target.length && $target
 || $('[name=' + this.hash.slice(1) +']');
 if ($target.length) {
 var targetOffset = $target.offset().top;
 $('html,body')
 .animate({scrollTop: targetOffset}, 900);
 return false;
 }
 }
 });
// how to use
// place this where you want to scroll to
<A name=top></A>
// the link
<A href="#top">go to top</A>
});

10. Get the XY value of the mouse pointer
Want to know where your mouse cursor is? 


$(document).ready(function() {
 $().mousemove(function(e){
 //display the x and y axis values inside the div with the id XY
 $('#XY').html("X Axis : " + e.pageX + " | Y Axis " + e.pageY);
 });
// how to use
<DIV id=XY></DIV>

});

11. Return to the top button
You can use animate and scrollTop to return animations to the top without using other plug-ins. 


$(document).ready(function() {
$("input.text1").val("Enter your search text here");
 textFill($('input.text1'));
});
 
 function textFill(input){ //input focus text function
 var originalvalue = input.val();
 input.focus( function(){
  if( $.trim(input.val()) == originalvalue ){ input.val(''); }
 });
 input.blur( function(){
  if( $.trim(input.val()) == '' ){ input.val(originalvalue); }
 });
}
0

Changing the value of scrollTop can adjust the return distance from the top, while the second parameter of animate is the time (in milliseconds) required to perform the return action.

Today I would like to introduce part 1 of jQuery techniques to you. I hope you will continue to pay attention to the following articles.

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