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Questions
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What
is jQuery ?
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Answers
: 1
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It's
very simple but most valuable Question on jQuery means jQuery is a fast and
concise JavaScript Library that simplifies HTML document traversing,
animating, event handling, and Ajax
interactions for rapid web development. jQuery is designed to change the way
that you write JavaScript. Jquery is build library for javascript no need to
write your own functions or script jquery all ready done for you
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Questions
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How
you will use Jquery means requirement needed for using jquery
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Answers
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Nothing more need to do
just olny download jquery library(.js file) from any of the jquery site Download jquery and
just linked with your html pages like all other javascript file
like
below :
< script src="jquery.js" language="javascript" type="text/javascript"> |
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Questions
: 3
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what
the use of $ symbol in Jquery
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Answers
: 3
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$ Symbol is just
replacement of jquery means at the place of $ you may use jquery hence $
symbol is used for indication that this line used for jquery |
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Questions
: 4
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How
do you select an item using css class or ID and get the value by use of
jquery
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Answers
: 4
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If an
element of html like < div> , < p> or any tag have ID MyId and
class used MyClass then we select the element by below jquery code
$('#MyId') for ID and for classs $('.MyClass') and for value var myValue = $('#MyId').val(); // get the value in var Myvalue by id Or for set the value in selected item $('#MyId').val("print me"); // set the value of a form input |
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Questions
: 5
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How
to get the server response from an AJAX
request using Jquery?
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Answers
: 5
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When invoking functions
that have asynchronous behavior We must provide a callback function to
capture the desired result. This is especially important with AJAX in the browser
because when a remote request is made, it is indeterminate when the response
will be received. Below an example of making an AJAX call and alerting the response (or error): $.ajax({
url: 'pcdsEmpRecords.php',
success: function(response) {
alert(response);
},
error: function(xhr) {
alert('Error! Status = ' + xhr.status); }
}); |
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Questions
: 6
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How
do you update ajax
response with id " resilts"
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Answers
: 6
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By using below code we
can update div content where id 'results' with ajax response function updateStatus() {
$.ajax({
url: 'pcdsEmpRecords.php',
success: function(response) {
// update div id Results
$('#results').html(response);
}
});
} |
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Questions
: 7
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How
do You disable or enable a form element?
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Answers
: 7
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There are two ways to
disable or enable form elements. Set the 'disabled' attribute to true or false: // Disable #pcds
$('#pcds').attr('disabled', true);
// Enable #pcds $('#pcds').attr('disabled', false);
Add or remove the
'disabled' attribute: // Disable #pcds
$("#pcds").attr('disabled', 'disabled');
// Enable #x $("#pcds").removeAttr('disabled');
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Questions
: 8
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How
do you check or uncheck a checkbox input or radio button?
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Answers
: 8
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There are two ways to
check or uncheck a checkbox or radio button. Set the 'checked' attribute to true or false. // Check #pcds
$('#pcds').attr('checked', true);
// Uncheck #pcds $('#pcds').attr('checked', false);
Add or remove the
'checked' attribute: // Check #pcds
$("#pcds").attr('checked', 'checked');
// Uncheck #pcds $("#pcds").removeAttr('checked');
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Questions
: 9
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How
do you get the text value of a selected option?
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Answers
: 9
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Select elements
typically have two values that you want to access. First there's the value to
be sent to the server, which is easy: $("#pcdsselect").val();
// => 1The second is the text value of the select. For example, using the following select box: <select id="pcdsselect">
<option value="1">Mr</option>
<option value="2">Mrs</option>
<option value="3">Ms</option>
<option value="4">Dr</option>
<option value="5">Prof</option>
</select>If you wanted to get the string "Mr" if the first option was selected (instead of just "1"), you would do that in the following way: $("#mpcdsselect option:selected").text();
// => "Mr" |
Jquery
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