First of all, sorry if this is a simple question. I am new to jQuery and I want to know how can I check if an element exists and if it does, change the css property.
Here is what I mean: I have the following list:
<ul class="element-rendered">
<li class="element-choice">Item A</li>
<li class="select-inline">Item B</li>
</ul>
I want to know how can I check if the class select-inline exists inside element-rendered and if it does, how can I change the css background of element-choice to blue?
I created a fiddle to reproduce this example.
Again sorry if this is a simple question but I am new to jQuery.
First of all, sorry if this is a simple question. I am new to jQuery and I want to know how can I check if an element exists and if it does, change the css property.
Here is what I mean: I have the following list:
<ul class="element-rendered">
<li class="element-choice">Item A</li>
<li class="select-inline">Item B</li>
</ul>
I want to know how can I check if the class select-inline exists inside element-rendered and if it does, how can I change the css background of element-choice to blue?
I created a fiddle to reproduce this example.
Again sorry if this is a simple question but I am new to jQuery.
Share Improve this question asked Oct 7, 2015 at 14:42 brunoddbrunodd 2,58412 gold badges45 silver badges68 bronze badges 3-
1
if($('.element-rendered .select-inline').length) { $('.element-choice').css('background', 'blue'); }Check updated fiddle – Tushar Commented Oct 7, 2015 at 14:44 - Hey @Tushar thank you again! You are always helping me here! haha! That worked. Would you mind answer that so I can mark as correct? – brunodd Commented Oct 7, 2015 at 14:47
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$('.element-rendered .select-inline').css("background-color", "red")will (almost) be a no-op if the element is not found in the DOM. You could go without checking the existance at all – Andreas Commented Oct 7, 2015 at 14:48
6 Answers
Reset to default 3You can use .length to check if the element exists in DOM.
$('.element-rendered .select-inline') will select all the elements having class select-inline inside the element with class element-rendered. .length on selector will return the number of matched elements. So, number greater that one, means the element exists. Then you can use .css to set inline styles.
Demo
if ($('.element-rendered .select-inline').length) {
$('.element-choice').css('background', 'blue');
}.element-choice {
width: 100%;
background: red;
}<script src="https://ajax.googleapis./ajax/libs/jquery/1.10.1/jquery.min.js"></script>
<ul class="element-rendered">
<li class="element-choice">Item A</li>
<li class="select-inline">Item B</li>
</ul>I'll also remend you to use class in CSS and add it to the element by using addClass.
Demo
var eR = $(".element-rendered");
if (eR.find(".select-inline").length > 0){
eR.find(".element-choice").css("color", "blue");
}
This would work for your specific example.
Find the select-line element which is a child of element-rendered. The find all of the sibling elements with class element-choice and apply the css.
$('.element-rendered>.select-inline').siblings('.element-choice').css('background','blue')
http://jsfiddle/SeanWessell/hjpng78s/3/
To check if element exists could use .is() , or as suggested by @Tushar .length
var container = $(".element-rendered");
// alternatively `!!$(".select-inline", container).length`
$(".select-inline", container).is("*")
&& $(".element-choice", container).css("background", "blue");
jsfiddle http://jsfiddle/hjpng78s/6/
Demo
if($(".element-rendered .select-inline")[0])
$(".element-rendered .select-inline").css("background-color","red");
How can I check if the class select-inline exists inside element-rendered and if it does, how can I change the css background of element-choice to blue?
if ( $(".element-rendered > .select-inline").length ) {
$(".element-rendered > .element-choice").css({
'background-color': 'blue'
});
}
Docs:
- Find the number of elements in the jQuery object.
- Set one or more CSS properties for the matched element