What is a simple jQuery statement that states an operation proceeds only if A and B are true? If A isn't true, stop. If A and B are true, then continue. `
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3As asked, this seems a general javascript question -- can you please clarify what's jquery-specific about it?Alex Martelli– Alex Martelli2009-05-20 01:22:46 +00:00Commented May 20, 2009 at 1:22
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2I hope you realize that jquery is a library, and the language still is javascript.jrharshath– jrharshath2009-05-20 05:19:41 +00:00Commented May 20, 2009 at 5:19
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3Yes, harshath.jr, I realize that.Kevin Brown– Kevin Brown2009-05-21 15:46:57 +00:00Commented May 21, 2009 at 15:46
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2I'm assuming that the OP is looking for something that would lead to a jquery construct like this: $(selector).DoIf(function(){return A && B})// continue jquery chaining but actions only happen if the DoIf predicate succeedsstevenrcfox– stevenrcfox2012-03-16 11:26:40 +00:00Commented Mar 16, 2012 at 11:26
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1in which case $(selector).filter(function(index)) can do what he's looking for.stevenrcfox– stevenrcfox2012-03-16 11:34:42 +00:00Commented Mar 16, 2012 at 11:34
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7 Answers
jQuery is just a library which enhances the capabilities of the DOM within a web browser; the underlying language is JavaScript, which has, as you might hope to expect from a programming language, the ability to perform conditional logic, i.e.
if( condition ) {
// do something
}
Testing two conditions is straightforward, too:
if( A && B ) {
// do something
}
Dear God, I hope this isn't a troll...
Comments
You can wrap jQuery calls inside normal JavaScript code. So, for example:
$(document).ready(function() {
if (someCondition && someOtherCondition) {
// Make some jQuery call.
}
});
Comments
To add to what the others are saying, A and B can be function calls as well that return boolean values. If A returns false then B would never be called.
if (A() && B()) {
// if A() returns false then B() is never called...
}
1 Comment
Schotime
As long as A() doesn't return false or null it will be true.
It depends on what you mean by stop. If it's in a function that can return void then:
if(a && b) {
// do something
}else{
// "stop"
return;
}
Comments
if(A && B){ }
Comments
I little sophisticated way:
$(selector).is(condition)? alert('true') : alert('false');
Ex:
$("#btn-primary").is(":disabled")? alert('button disabled') : alert('button disabled');
Comments
If you're using Jquery to manipulate the DOM, then I have found the following a good way to include logic in a Jquery statement:
$(selector).addClass(A && B?'classIfTrue':'');
1 Comment
Kevin Brown
This answer is deviant to the question asked.