Javascript – JQuery, bind same function to 3 different textboxs’ keyup event

bindeventsjavascriptjquery

I have 3 textboxes, and on the keyup event for all 3, I want to call the same function?

In the below code, I am tring to bind keyup event to CalculateTotalOnKeyUpEvent function to a textbox named compensation, but it doesn't work:

$("#compensation").bind("keyup", CalculateTotalOnKeyUpEvent(keyupEvent));

function CalculateTotalOnKeyUpEvent(keyupEvent) {
  var keyCode = keyupEvent.keyCode;
  if (KeyStrokeAllowdToCalculateRefund(keyCode)) {
    CalculateTotalRefund();
  }
};

Best Solution

You need do like this:

// Edit according to request in the comment: 
// in order to select more than one element,
// you need to specify comma separated ids.
// Also, maybe you need to consider to use a CSS class for the selected elements,
// then it could be just $(".className")
$("#element1, #element2, ....").bind("keyup", CalculateTotalOnKeyUpEvent);

You need to pass the function as a parameter, you do not need to pass the function as it was declared.

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Javascript – n “exists” function for jQuery

In JavaScript, everything is 'truthy' or 'falsy', and for numbers 0 means false, everything else true. So you could write:

if ($(selector).length)

You don't need that >0 part.

Javascript – Event binding on dynamically created elements

As of jQuery 1.7 you should use jQuery.fn.on with the selector parameter filled:

$(staticAncestors).on(eventName, dynamicChild, function() {});

Explanation:

This is called event delegation and works as followed. The event is attached to a static parent (staticAncestors) of the element that should be handled. This jQuery handler is triggered every time the event triggers on this element or one of the descendant elements. The handler then checks if the element that triggered the event matches your selector (dynamicChild). When there is a match then your custom handler function is executed.

Prior to this, the recommended approach was to use live():

$(selector).live( eventName, function(){} );

However, live() was deprecated in 1.7 in favour of on(), and completely removed in 1.9. The live() signature:

$(selector).live( eventName, function(){} );

... can be replaced with the following on() signature:

$(document).on( eventName, selector, function(){} );

For example, if your page was dynamically creating elements with the class name dosomething you would bind the event to a parent which already exists (this is the nub of the problem here, you need something that exists to bind to, don't bind to the dynamic content), this can be (and the easiest option) is document. Though bear in mind document may not be the most efficient option.

$(document).on('mouseover mouseout', '.dosomething', function(){
    // what you want to happen when mouseover and mouseout 
    // occurs on elements that match '.dosomething'
});

Any parent that exists at the time the event is bound is fine. For example

$('.buttons').on('click', 'button', function(){
    // do something here
});

would apply to

<div class="buttons">
    <!-- <button>s that are generated dynamically and added here -->
</div>

Best Solution

Related Solutions

Javascript – n “exists” function for jQuery

Javascript – Event binding on dynamically created elements

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