jQuery – devfrontend.info

[jQuery] Performances: comment utiliser de multiples éléments mis en cache?

05/02/2021 / admin

Source: jQuery, how to use multiple cached elements

  const $_CATEGORY_ICON_MEGAMENU_SECONDARY = $('#megaMenuSecondaryCategoryIcon'),
        $_CATEGORY_LABEL_MEGAMENU_SECONDARY = $('#megaMenuSecondaryCategoryLabel'),
        $_CATEGORY_LINK_MEGAMENU_SECONDARY = $('#megaMenuSecondaryCategoryLink'),
        $_CATEGORY_NAV_MEGAMENU_SECONDARY = $('#megaMenuSecondaryCategoryNav'),
        $_CATEGORY_IMAGE_MEGAMENU_SECONDARY = $('#megaMenuSecondaryCategoryImage');

const $_CATEGORY_ICON_MEGAMENU_SECONDARY = $('#megaMenuSecondaryCategoryIcon'),

$_CATEGORY_LABEL_MEGAMENU_SECONDARY = $('#megaMenuSecondaryCategoryLabel'),

$_CATEGORY_LINK_MEGAMENU_SECONDARY = $('#megaMenuSecondaryCategoryLink'),

$_CATEGORY_NAV_MEGAMENU_SECONDARY = $('#megaMenuSecondaryCategoryNav'),

$_CATEGORY_IMAGE_MEGAMENU_SECONDARY = $('#megaMenuSecondaryCategoryImage');

        console.time('emptyThings');
        $_CATEGORY_ICON_MEGAMENU_SECONDARY.empty();
        $_CATEGORY_LABEL_MEGAMENU_SECONDARY.empty();
        $_CATEGORY_LINK_MEGAMENU_SECONDARY.empty();
        $_CATEGORY_NAV_MEGAMENU_SECONDARY.empty();
        $_CATEGORY_IMAGE_MEGAMENU_SECONDARY.empty();
        console.timeEnd('emptyThings');

console.time('emptyThings');

$_CATEGORY_ICON_MEGAMENU_SECONDARY.empty();

$_CATEGORY_LABEL_MEGAMENU_SECONDARY.empty();

$_CATEGORY_LINK_MEGAMENU_SECONDARY.empty();

$_CATEGORY_NAV_MEGAMENU_SECONDARY.empty();

$_CATEGORY_IMAGE_MEGAMENU_SECONDARY.empty();

console.timeEnd('emptyThings');

emptyThings: 1.92041015625 ms
megamenu.js:127 emptyThings: 4.44091796875 ms
megamenu.js:127 emptyThings: 1.739990234375 ms
megamenu.js:127 emptyThings: 2.5419921875 ms
megamenu.js:127 emptyThings: 1.958740234375 ms
megamenu.js:127 emptyThings: 2.581787109375 ms
megamenu.js:127 emptyThings: 2.59912109375 ms
megamenu.js:127 emptyThings: 2.1240234375 ms
megamenu.js:127 emptyThings: 3.0361328125 ms
megamenu.js:127 emptyThings: 3.2548828125 ms

        console.time('emptyThings');
        $([$_CATEGORY_ICON_MEGAMENU_SECONDARY[0], $_CATEGORY_LABEL_MEGAMENU_SECONDARY[0], $_CATEGORY_LINK_MEGAMENU_SECONDARY[0], $_CATEGORY_NAV_MEGAMENU_SECONDARY[0], $_CATEGORY_IMAGE_MEGAMENU_SECONDARY[0]]).empty();
        console.timeEnd('emptyThings');

console.time('emptyThings');

$([$_CATEGORY_ICON_MEGAMENU_SECONDARY[0], $_CATEGORY_LABEL_MEGAMENU_SECONDARY[0], $_CATEGORY_LINK_MEGAMENU_SECONDARY[0], $_CATEGORY_NAV_MEGAMENU_SECONDARY[0], $_CATEGORY_IMAGE_MEGAMENU_SECONDARY[0]]).empty();

console.timeEnd('emptyThings');

emptyThings: 1.552001953125 ms
megamenu.js:131 emptyThings: 4.814697265625 ms
megamenu.js:131 emptyThings: 2.326904296875 ms
megamenu.js:131 emptyThings: 2.762939453125 ms
megamenu.js:131 emptyThings: 3.281982421875 ms
megamenu.js:131 emptyThings: 1.970947265625 ms
megamenu.js:131 emptyThings: 2.184814453125 ms
megamenu.js:131 emptyThings: 3.62109375 ms
megamenu.js:131 emptyThings: 3.26123046875 ms
megamenu.js:131 emptyThings: 3.065673828125 ms

[jQuery] Utiliser la méthode .contents() pour supprimer un élément parent du DOM, mais conserver tous ses enfants

10/12/2020 / admin

Cette méthode fait écho à tous les posts dans différents blogs et forums qui incitent à utiliser la méthode .unwrap() de jQuery. La méthode .contents() récupère absolument tout ce que contient l’élément parent qu’on souhaite supprimer alors qu'.unwrap() se montre plus sélective, ce qui peut entrainer quelques désagréments (perte de contenu, etc…).

Source: How to remove only the parent element and not its child elements in JavaScript?

HTML:

<div>
  pre text
  <div class="remove-just-this">
    <p>child foo</p>
    <p>child bar</p>
    nested text
  </div>
  post text
</div>

<div>

pre text

<p>child foo</p>

<p>child bar</p>

nested text

</div>

post text

</div>

jQuery:

var cnt = $(".remove-just-this").contents();
$(".remove-just-this").replaceWith(cnt);

1 2	var cnt = $(".remove-just-this").contents(); $(".remove-just-this").replaceWith(cnt);

Résultat dans le DOM:

<div>
  pre text
  <p>child foo</p>
  <p>child bar</p>
  nested text
  post text
</div>

<div>

pre text

<p>child foo</p>

<p>child bar</p>

nested text

post text

</div>

[jQuery][bxSlider] Les liens dans le slider ne fonctionnent pas

30/10/2019 / admin

Solution: stevenwanderski/bxslider-4: links in sliders aren’t working – Error in the latest version of Chrome (73.0.3683.75).

I might have found a reliable fix for this. The problem happens in Chrome because it doesn’t fire a click event after pointerup unlike other browsers such as Firefox. This is because bxslider in onTouchStart function sets slider viewport as target of all succeeding pointer events. Now if you have a link inside a slide when you click the link the target of pointerdown is not slider viewport, but the link content and since this target is different from pointerup target (which is slider viewport), then Chrome doesn’t fire a click. The solution is to make sure pointerup fires on the same element as pointerdown so that Chrome fires a click. So we need to refactor this snippet:

        if (slider.viewport.get(0).setPointerCapture) {
          slider.pointerId = orig.pointerId;
          slider.viewport.get(0).setPointerCapture(slider.pointerId);
        }

if (slider.viewport.get(0).setPointerCapture) {

slider.pointerId = orig.pointerId;

slider.viewport.get(0).setPointerCapture(slider.pointerId);

}

to this:

        if (e.target.setPointerCapture) {
          slider.pointerId = orig.pointerId;
          e.target.setPointerCapture(slider.pointerId);
        }

if (e.target.setPointerCapture) {

slider.pointerId = orig.pointerId;

e.target.setPointerCapture(slider.pointerId);

}

This solved the problem for me in Chrome without loss of any functionality in any browser or mobile device.

[jQuery] Exploiter $.noConflict(true); pour utiliser plusieurs versions de jQuery dans une même page

17/10/2019 / admin

Source: Can I use multiple versions of jQuery on the same page?. Utiliser de multiples versions de jQuery dans une même page.

<!-- load jQuery 1.1.3 -->
<script type="text/javascript" src="http://example.com/jquery-1.1.3.js"></script>
<script type="text/javascript">
var jQuery_1_1_3 = $.noConflict(true);
</script>

<!-- load jQuery 1.3.2 -->
<script type="text/javascript" src="http://example.com/jquery-1.3.2.js"></script>
<script type="text/javascript">
var jQuery_1_3_2 = $.noConflict(true);
</script>

var jQuery_1_1_3 = $.noConflict(true);

</script>

var jQuery_1_3_2 = $.noConflict(true);

</script>

A l’utilisation, à la place de $('#selector').function();, vous utiliseriez jQuery_1_3_2('#selector').function(); ou jQuery_1_1_3('#selector').function();

[jQuery] Détecter les changements d’état (coché/pas coché) d’un champ radio ou checkbox et agir en fonction

17/07/2019 / admin

Sources:

How to detect a checkbox click in jQuery

<input type="checkbox" id="" class"js-selectRow" name="" value="" />

1	<input type="checkbox" id="" class"js-selectRow" name="" value="" />

  $(document).on('change', '.js-selectRow', function() {
    const $_THIS = $(this);
    if ( $_THIS.prop('checked') === true ) {
      // if is checked do sth...
      $_THIS.closest('tr').addClass('row-isSelected');
    } else if ( $_THIS.prop('checked') === false ) {
      // if is not checked do sth else...
      $_THIS.closest('tr').removeClass('row-isSelected');
    }
  });

$(document).on('change', '.js-selectRow', function() {

const $_THIS = $(this);

if ( $_THIS.prop('checked') === true ) {

// if is checked do sth...

$_THIS.closest('tr').addClass('row-isSelected');

} else if ( $_THIS.prop('checked') === false ) {

// if is not checked do sth else...

$_THIS.closest('tr').removeClass('row-isSelected');

}

});

[jQuery] Vider des champs de formulaire de manière dynamique

15/04/2019 / admin

Dans cet exemple, on vide tous les champs de formulaire enfant de l’élément qui a la classe .form-group.hidden

  $.fn.clearHiddenControls = function(){
    // https://stackoverflow.com/questions/6364289/clear-form-fields-with-jquery/16105303
    $('.form-group.hidden', $_USER_ASSISTANCE_FORM).each(function(){
      const $_THIS = $(this);
      $_THIS.find('input[type="radio"], input[type="checkbox"]').prop('checked', false);
      $_THIS.find('option').prop('selected', false);
      $_THIS.find('input[type="file"], textarea').val('');
    });    
  }

$.fn.clearHiddenControls = function(){

// https://stackoverflow.com/questions/6364289/clear-form-fields-with-jquery/16105303

$('.form-group.hidden', $_USER_ASSISTANCE_FORM).each(function(){

const $_THIS = $(this);

$_THIS.find('input[type="radio"], input[type="checkbox"]').prop('checked', false);

$_THIS.find('option').prop('selected', false);

$_THIS.find('input[type="file"], textarea').val('');

});

}

$(document).clearHiddenControls();

1	$(document).clearHiddenControls();

[jQuery] Des plugins pour gérer des actions conditionnelles (notamment afficher/masquer des champs de formulaire)

15/04/2019 / admin

conditionize2.js

A flexible jQuery plugin for conditional actions (like showing and hiding elements, triggering events or whatever else you need) based on values of one or many fields. This is an improved version of conditionize.js jQuery plugin. Unlike the previous version, conditionize2.js is not restricted to only show and hide actions. But for simpler migration from conditionize.js to conditionize2.js, show/hide is the default behaviour.

A lot of EXAMPLES available here.

dependsOn

A jQuery plugin to facilitate the handling of form field dependencies. Demo.

[jQuery] Vérifier si au moins une checkbox est cochée

09/04/2019 / admin

Source: jQuery see if any or no checkboxes are selected

  // jQuery see if any or no checkboxes are selected
  // https://stackoverflow.com/a/4087006
  $.fn.areAnyCheckboxesChecked = function(HTMLScope){
    // Retourne true/false
    return !!$('input[type=checkbox]:checked', HTMLScope).length;

    // Retourne le nombre de checkboxes qui sont checked (0 si aucune)
    return $('input[type=checkbox]:checked', HTMLScope).length;
  }

// jQuery see if any or no checkboxes are selected

// https://stackoverflow.com/a/4087006

$.fn.areAnyCheckboxesChecked = function(HTMLScope){

// Retourne true/false

return !!$('input[type=checkbox]:checked', HTMLScope).length;

// Retourne le nombre de checkboxes qui sont checked (0 si aucune)

return $('input[type=checkbox]:checked', HTMLScope).length;

}

[jQuery] Cliquer sur une zone contenant un input type radio ou checkbox actionne le booléen

08/04/2019 / admin

Ressources en ligne: Setting “checked” for a checkbox with jQuery?

<td class="col-damaged col-boolean" onClick="$(this).booleanIntent(event);">
  <input type="checkbox" id="product_00001_damaged" name="product_00001" />
</td>

</td>

ATTENTION: l’utilisation de $(this) dans la fonction pour récupérer l’élément cliqué empêche le clic sur l’élément <input type="checkbox" /> lui-même! On préférera utiliser event.target pour cibler l’élément cliqué.

Code non commenté

  $.fn.booleanIntent = function(event){
    const $_TARGET = $(event.target);

    if ( $_TARGET.is('input') ) {
      return false;
    } else {
      const $_INPUT = $_TARGET.children('input'),
            CHECKED_VALUE = $_INPUT.prop('checked');

      if ( CHECKED_VALUE != true ) {
        $_INPUT.prop('checked', true);
      } else {
        $_INPUT.prop('checked', false);
      }
    }
  }

$.fn.booleanIntent = function(event){

const $_TARGET = $(event.target);

if ( $_TARGET.is('input') ) {

return false;

} else {

const $_INPUT = $_TARGET.children('input'),

CHECKED_VALUE = $_INPUT.prop('checked');

if ( CHECKED_VALUE != true ) {

$_INPUT.prop('checked', true);

} else {

$_INPUT.prop('checked', false);

}

Code commenté

  $.fn.booleanIntent = function(event){
    const $_TARGET = $(event.target);

    if ( $_TARGET.is('input') ) {
      console.log('is input');
      return false;
    } else {
      console.log('is not input');
      const $_INPUT = $_TARGET.children('input'),
            CHECKED_VALUE = $_INPUT.prop('checked');
      console.log('CHECKED_VALUE: '+CHECKED_VALUE);

      if ( CHECKED_VALUE != true ) {
        console.log('input is not checked, so we check it');
        $_INPUT.prop('checked', true);
      } else {
        console.log('input is checked, so we uncheck it');
        $_INPUT.prop('checked', false);
      }
    }
  }

$.fn.booleanIntent = function(event){

const $_TARGET = $(event.target);

if ( $_TARGET.is('input') ) {

console.log('is input');

return false;

} else {

console.log('is not input');

const $_INPUT = $_TARGET.children('input'),

CHECKED_VALUE = $_INPUT.prop('checked');

console.log('CHECKED_VALUE: '+CHECKED_VALUE);

if ( CHECKED_VALUE != true ) {

console.log('input is not checked, so we check it');

$_INPUT.prop('checked', true);

} else {

console.log('input is checked, so we uncheck it');

$_INPUT.prop('checked', false);

}

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Catégorie : jQuery

[jQuery] Performances: comment utiliser de multiples éléments mis en cache?

[jQuery] Utiliser la méthode .contents() pour supprimer un élément parent du DOM, mais conserver tous ses enfants

HTML:

jQuery:

Résultat dans le DOM:

[jQuery][bxSlider] Les liens dans le slider ne fonctionnent pas

[jQuery] Exploiter $.noConflict(true); pour utiliser plusieurs versions de jQuery dans une même page

[jQuery] Détecter les changements d’état (coché/pas coché) d’un champ radio ou checkbox et agir en fonction

[jQuery] Vider des champs de formulaire de manière dynamique

[jQuery] Des plugins pour gérer des actions conditionnelles (notamment afficher/masquer des champs de formulaire)

conditionize2.js

dependsOn

[jQuery] Vérifier si au moins une checkbox est cochée

[jQuery] Cliquer sur une zone contenant un input type radio ou checkbox actionne le booléen

Code non commenté

Code commenté

Le bloc-notes professionnel d'un développeur front-end senior

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Méta

HTML:

jQuery:

Résultat dans le DOM:

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