Most frequently Asked PHP jQuery Interview Questions and Answers for freshers and experienced pdf free download
1. What is j-Query?
JQuery is a light weight JavaScript library which provides fast and easy way of HTML DOM traversing and manipulation, its event handling, its client side animations, etc. One of the greatest features of jQuery is that jQuery supports an efficient way to implement AJAX applications because of its light weight nature and make normalize and efficient web programs.
2. How to use jQuery?
jQuery can be easily used with other libraries so it should work out of the box with simple and complex JavaScript and Ajax..
3. How to use jQuery library in our ASP.Net project?
Download the latest jQuery library from jQuery.com and include the reference to the jQuery library file in our ASPX page.
<script src="_scripts/jQuery-1.2.6.js" type="text/javascript"></script>
<script language="javascript">
$(document).ready(function() {
alert('test');
});
</script>
4. What were the biggest challenges of getting the 1.7 release out there?
Our test coverage is still incomplete, and with every fixed bug, we introduced 2 others, which made the arrival at a stable level extremely difficult. Every week, there were some 50-100 bugs entered in the bugtracker, and there was literally no end. Luckily, we were able to triage the bugs to critical and blockers and solve these in time for a release. You have to have a lot of guts to push out a release that’s still imperfect - but an imperfect release is better than one that gets delayed for months. You can always roll out 1.7.1.
5. Jumping off of jQuery UI for a second, Do you “release early, release often” with all of your projects? What are your thoughts on that strategy?
Speaking for myself, I often release too early. That has been a problem in the past, when we released versions as stable that weren’t, for instance. So it’s important to find a combination of both - a stable release must be stable, while development cannot be halted or blocked through stubborn processes. A labs section is great in that way - it allows developers to contribute freely and plan on an open canvas, with early preview releases, and the work can later be merged back.
6. Mac, Windows or Linux? Why do you love this platform while using jQuery?
I switched to Mac hardware around a year ago and I’m totally in love with it. All components work together nicely, and so far, I never had to return my Mac book Pro to the Apple Store because of an issue. However, I’m still using Windows through Parallels because OSX, while visually nice and stable, has fundamental usability flaws.
One of these flaws is the Finder. I recently worked on the jQuery UI Selectables in the labs version, and once again saw that the Finder had great flaws when it comes down to selection. For instance, if you select multiple items and click on one of them, the multiple selection isn’t cleared. Also, my tools that I love for windows simply don’t have an alternative yet .
7. What are your tools of choice to get the jQuery job done?
For editing files, I love the e texteditor (yep, the name is “e”). It basically started as a textmate clone for windows, but since then grew into something much greater. One of the features I can’t live without now is there great multiple selection support. Hold down CTRL, select a couple words through double clicking and then type over all of them. Is that cool or what? On a sidenote, on one of my talks in Japan the audience asked why I’m so insane to use a Textmate clone through an emulated Windows on OSX - I showed them this exact feature, and they were all amazed.
Other than that, I like TortoiseSVN, even if it slows down the Explorer, I love Photoshop, especially the new version with hardware acceleration, Trillian Astra for instant messaging, Gmail for email, Firefox 3 for browsing, VideoLAN for playing video, Keynote for preparing presentations, and WinSCP/Putty to do server administration. Phew, I guess that’s about it
8. Back onto jQuery UI… Can you see jQuery UI making more of an impression in the future, lead by the current successes of jQuery?
This question is difficult to answer because jQuery, other than jQuery UI, can be useful almost everytime. jQuery UI gives you a specific set of user interface widgets and behaviours, and many people think of it as loosing a kind of freedom. On the other hand, there’s definitely some connection - if you’re using Prototype already, and you’re looking for an UI framework, your choice is most often script.aculo.us. If you’re using jQuery, why not use the official side project?
9. Whats next on the hitlist with jQuery UI?
There’s a lot of movement right now. We finally pushed out 1.7 3 days ago, which we believe is a solid foundation for everything that’s coming in in the next couple of months. While 1.7 was a stability and foundation release, the next releases will concentrate around features, so expect to see many more components soon. Some examples are the colorpicker, menu, grid, tooltip and tree widgets.
Additionally, my personal goal is to target more platforms, for example the iPhone. Early test implementations I did show that it’s fairly doable to support the touch events, and therefore make all jQuery UI interaction compatible with mobile devices.
Additionally, I’m working on a brand new lab section to be able to push feature development without any restrictions. This allows us to work on anything we find is cool, but maybe not on the roadmap.
10. Is it too early to discuss jQuery UI 1.8?
There’s a lot on our list for the year. Filament Group did a great job to start a list of all widgets they could imagine being part of jQuery UI, which can be found and discussed in the jQuery UI planning wiki at http://wiki.jqueryui.com. There’s no definite roadmap for 1.8 yet, but some components are likely to make it into the next release. For instance, widgets that are already being worked on (grid, menu), as well as widgets that we had to kick out of 1.6/1.7 because they weren’t stable enough (spinner, colorpicker, autocomplete). It will be a huge feature release!
11. And finally, If you could give one tip to any new budding jQuery UI developers, what would it be?
Think different. No, seriously. For jQuery UI, we’re trying to take the same path than jQuery, and people that are restricted to thinking in classical OOP patterns will have a problem. If you think about it freely and give the functional, event-driven and progressive approach a try, you’ll find yourself getting the work done with jQuery UI in a fraction of the time needed than with other frameworks.
12. what is jQuery connect?
It is a jquery plugin which enables us to connect a function to another function. It is like assigning a handler for another function. This situation happens when you are using any javascript plugins and you want to execute some function when ever some function is executed from the plugin. This we can solve using jquery connect function.
13. How to use jQuery.connect?
download jquery.connect.js file
include this file in your html file.
and use $.connect function to connect a function to another function.
14. Different ways of using $.connect function in jQuery?
The syntax of connect function is
$.connect(sourceObj/*object*/, sourceFunc/*string*/, callObj/*object*/, callFunc/*string or Func*/)
sourceObj(optional) is the object of the source function to which we want to connect
sourceFunc is the function name to which we want to connect
callObj(optional) is the object which we want to use for the handler function
callFunc is the function that we want to execute when sourceFunc is executed.
Here sourceObj, callObj are optional for the global functions.
suppose if your sourceFunc is global function then no need to pass the sourceObj or you can use null or self
suppose if your callObj is global function then no need to pass the callObj or you can use null or self
ex:
// fun1, fun2 are global functions
1. $.connect('fun1',fun2)
2. $.connect(null,'fun1',fun2)
3. $.connect(self,'fun1',fun2)
4. $.connect('fun1',null,fun2)
5. $.connect('fun1',self,fun2)
6. $.connect(self,'fun1',null,fun2)
// fun1 is function of obj and fun2 is global function
1. $.connect(obj,'fun1',fun2)
2. $.connect(obj,'fun1',null,fun2)
3. $.connect(obj,'fun1',null,'fun2')
4. $.connect(obj,'fun1',self,fun2)
5. $.connect(obj,'fun1',self,'fun2')
// fun1 is global and fun2 is function of obj
1. $.connect(obj,'fun1',fun2)
2. $.connect(obj,'fun1',null,fun2)
3. $.connect(obj,'fun1',null,'fun2')
4. $.connect(obj,'fun1',self,fun2)
5. $.connect(obj,'fun1',self,'fun2')
// fun1 is function of obj1 and fun2 is function of obj2
1.$.connect(obj1,'fun1',obj2,obj.fun2)
2.$.connect(obj1,'fun1',obj2,'fun2')
15. Do you have plans for a new jQuery plug-in or something else we should look out for? Where to from here for the imgPreview plugin?
I'm not sure, I'm largely unpredictable when it comes to jQuery; I'm still learning! If anyone has any requests feel free to forward me them! As for the imgPreview plugin I hope to keep it under constant development; any contributions or suggestions are welcomed!
16. Explain the concepts of "$ function" in jQuery with an example?
The type of a function is "function".
There are a lot of anonymous functions is jquery.
$(document).ready(function() {});
$("a").click(function() {});
$.ajax({
url: "someurl.php",
success: function() {}
});
17. Why is jQuery better than JavaScript?
* jQuery is great library for developing ajax based application.
* It helps the programmers to keep code simple and concise and reusable.
* jQuery library simplifies the process of traversal of HTML DOM tree.
* jQuery can also handle events, perform animation, and add the Ajax support in web applications.
18. Explain how jQuery Works?
<html>
<head>
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript">
// You can write the code here
</script>
</head>
<body>
<a href="http://www.atoztarget.com/">atoztarget</a>
</body>
</html>
19. When can you use jQuery?
jQuery can be used to for developing ajax based applications
It can be used to keep the code simple, concise and reusable.
It simplifies the process of traversal of HTML DOM tree.
It can also handle events, perform animation, and add the ajax support in web applications.
20. When can you use jQuery?
JQuery can be used to
apply CSS
call functions on events
traverse the documents
manipulation purpose and
to add effects too.
1. What is j-Query?
JQuery is a light weight JavaScript library which provides fast and easy way of HTML DOM traversing and manipulation, its event handling, its client side animations, etc. One of the greatest features of jQuery is that jQuery supports an efficient way to implement AJAX applications because of its light weight nature and make normalize and efficient web programs.
2. How to use jQuery?
jQuery can be easily used with other libraries so it should work out of the box with simple and complex JavaScript and Ajax..
3. How to use jQuery library in our ASP.Net project?
Download the latest jQuery library from jQuery.com and include the reference to the jQuery library file in our ASPX page.
<script src="_scripts/jQuery-1.2.6.js" type="text/javascript"></script>
<script language="javascript">
$(document).ready(function() {
alert('test');
});
</script>
4. What were the biggest challenges of getting the 1.7 release out there?
Our test coverage is still incomplete, and with every fixed bug, we introduced 2 others, which made the arrival at a stable level extremely difficult. Every week, there were some 50-100 bugs entered in the bugtracker, and there was literally no end. Luckily, we were able to triage the bugs to critical and blockers and solve these in time for a release. You have to have a lot of guts to push out a release that’s still imperfect - but an imperfect release is better than one that gets delayed for months. You can always roll out 1.7.1.
5. Jumping off of jQuery UI for a second, Do you “release early, release often” with all of your projects? What are your thoughts on that strategy?
Speaking for myself, I often release too early. That has been a problem in the past, when we released versions as stable that weren’t, for instance. So it’s important to find a combination of both - a stable release must be stable, while development cannot be halted or blocked through stubborn processes. A labs section is great in that way - it allows developers to contribute freely and plan on an open canvas, with early preview releases, and the work can later be merged back.
6. Mac, Windows or Linux? Why do you love this platform while using jQuery?
I switched to Mac hardware around a year ago and I’m totally in love with it. All components work together nicely, and so far, I never had to return my Mac book Pro to the Apple Store because of an issue. However, I’m still using Windows through Parallels because OSX, while visually nice and stable, has fundamental usability flaws.
One of these flaws is the Finder. I recently worked on the jQuery UI Selectables in the labs version, and once again saw that the Finder had great flaws when it comes down to selection. For instance, if you select multiple items and click on one of them, the multiple selection isn’t cleared. Also, my tools that I love for windows simply don’t have an alternative yet .
7. What are your tools of choice to get the jQuery job done?
For editing files, I love the e texteditor (yep, the name is “e”). It basically started as a textmate clone for windows, but since then grew into something much greater. One of the features I can’t live without now is there great multiple selection support. Hold down CTRL, select a couple words through double clicking and then type over all of them. Is that cool or what? On a sidenote, on one of my talks in Japan the audience asked why I’m so insane to use a Textmate clone through an emulated Windows on OSX - I showed them this exact feature, and they were all amazed.
Other than that, I like TortoiseSVN, even if it slows down the Explorer, I love Photoshop, especially the new version with hardware acceleration, Trillian Astra for instant messaging, Gmail for email, Firefox 3 for browsing, VideoLAN for playing video, Keynote for preparing presentations, and WinSCP/Putty to do server administration. Phew, I guess that’s about it
8. Back onto jQuery UI… Can you see jQuery UI making more of an impression in the future, lead by the current successes of jQuery?
This question is difficult to answer because jQuery, other than jQuery UI, can be useful almost everytime. jQuery UI gives you a specific set of user interface widgets and behaviours, and many people think of it as loosing a kind of freedom. On the other hand, there’s definitely some connection - if you’re using Prototype already, and you’re looking for an UI framework, your choice is most often script.aculo.us. If you’re using jQuery, why not use the official side project?
9. Whats next on the hitlist with jQuery UI?
There’s a lot of movement right now. We finally pushed out 1.7 3 days ago, which we believe is a solid foundation for everything that’s coming in in the next couple of months. While 1.7 was a stability and foundation release, the next releases will concentrate around features, so expect to see many more components soon. Some examples are the colorpicker, menu, grid, tooltip and tree widgets.
Additionally, my personal goal is to target more platforms, for example the iPhone. Early test implementations I did show that it’s fairly doable to support the touch events, and therefore make all jQuery UI interaction compatible with mobile devices.
Additionally, I’m working on a brand new lab section to be able to push feature development without any restrictions. This allows us to work on anything we find is cool, but maybe not on the roadmap.
10. Is it too early to discuss jQuery UI 1.8?
There’s a lot on our list for the year. Filament Group did a great job to start a list of all widgets they could imagine being part of jQuery UI, which can be found and discussed in the jQuery UI planning wiki at http://wiki.jqueryui.com. There’s no definite roadmap for 1.8 yet, but some components are likely to make it into the next release. For instance, widgets that are already being worked on (grid, menu), as well as widgets that we had to kick out of 1.6/1.7 because they weren’t stable enough (spinner, colorpicker, autocomplete). It will be a huge feature release!
11. And finally, If you could give one tip to any new budding jQuery UI developers, what would it be?
Think different. No, seriously. For jQuery UI, we’re trying to take the same path than jQuery, and people that are restricted to thinking in classical OOP patterns will have a problem. If you think about it freely and give the functional, event-driven and progressive approach a try, you’ll find yourself getting the work done with jQuery UI in a fraction of the time needed than with other frameworks.
12. what is jQuery connect?
It is a jquery plugin which enables us to connect a function to another function. It is like assigning a handler for another function. This situation happens when you are using any javascript plugins and you want to execute some function when ever some function is executed from the plugin. This we can solve using jquery connect function.
13. How to use jQuery.connect?
download jquery.connect.js file
include this file in your html file.
and use $.connect function to connect a function to another function.
14. Different ways of using $.connect function in jQuery?
The syntax of connect function is
$.connect(sourceObj/*object*/, sourceFunc/*string*/, callObj/*object*/, callFunc/*string or Func*/)
sourceObj(optional) is the object of the source function to which we want to connect
sourceFunc is the function name to which we want to connect
callObj(optional) is the object which we want to use for the handler function
callFunc is the function that we want to execute when sourceFunc is executed.
Here sourceObj, callObj are optional for the global functions.
suppose if your sourceFunc is global function then no need to pass the sourceObj or you can use null or self
suppose if your callObj is global function then no need to pass the callObj or you can use null or self
ex:
// fun1, fun2 are global functions
1. $.connect('fun1',fun2)
2. $.connect(null,'fun1',fun2)
3. $.connect(self,'fun1',fun2)
4. $.connect('fun1',null,fun2)
5. $.connect('fun1',self,fun2)
6. $.connect(self,'fun1',null,fun2)
// fun1 is function of obj and fun2 is global function
1. $.connect(obj,'fun1',fun2)
2. $.connect(obj,'fun1',null,fun2)
3. $.connect(obj,'fun1',null,'fun2')
4. $.connect(obj,'fun1',self,fun2)
5. $.connect(obj,'fun1',self,'fun2')
// fun1 is global and fun2 is function of obj
1. $.connect(obj,'fun1',fun2)
2. $.connect(obj,'fun1',null,fun2)
3. $.connect(obj,'fun1',null,'fun2')
4. $.connect(obj,'fun1',self,fun2)
5. $.connect(obj,'fun1',self,'fun2')
// fun1 is function of obj1 and fun2 is function of obj2
1.$.connect(obj1,'fun1',obj2,obj.fun2)
2.$.connect(obj1,'fun1',obj2,'fun2')
15. Do you have plans for a new jQuery plug-in or something else we should look out for? Where to from here for the imgPreview plugin?
I'm not sure, I'm largely unpredictable when it comes to jQuery; I'm still learning! If anyone has any requests feel free to forward me them! As for the imgPreview plugin I hope to keep it under constant development; any contributions or suggestions are welcomed!
16. Explain the concepts of "$ function" in jQuery with an example?
The type of a function is "function".
There are a lot of anonymous functions is jquery.
$(document).ready(function() {});
$("a").click(function() {});
$.ajax({
url: "someurl.php",
success: function() {}
});
17. Why is jQuery better than JavaScript?
* jQuery is great library for developing ajax based application.
* It helps the programmers to keep code simple and concise and reusable.
* jQuery library simplifies the process of traversal of HTML DOM tree.
* jQuery can also handle events, perform animation, and add the Ajax support in web applications.
18. Explain how jQuery Works?
<html>
<head>
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript">
// You can write the code here
</script>
</head>
<body>
<a href="http://www.atoztarget.com/">atoztarget</a>
</body>
</html>
19. When can you use jQuery?
jQuery can be used to for developing ajax based applications
It can be used to keep the code simple, concise and reusable.
It simplifies the process of traversal of HTML DOM tree.
It can also handle events, perform animation, and add the ajax support in web applications.
20. When can you use jQuery?
JQuery can be used to
apply CSS
call functions on events
traverse the documents
manipulation purpose and
to add effects too.
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