why does the first code work and the second doesn't work?
when I put div.main as a separated condition the code doesn't work
<div class="user-panel main">
<input type="text" name="login">
</div>
document.querySelector("div.user-panel.main input[name='login']").style.backgroundColor = "red"; // this code works
document.querySelector("div.user-panel div.main input[name='login']").style.backgroundColor = "red"; // this code doesn't work
javascript dom jsdom
asked Nov 25 '18 at 3:27
Abdullah MorsyAbdullah Morsy
62
add a comment |
when I put div.main as a separated condition the code doesn't work
<div class="user-panel main">
<input type="text" name="login">
</div>
document.querySelector("div.user-panel.main input[name='login']").style.backgroundColor = "red"; // this code works
document.querySelector("div.user-panel div.main input[name='login']").style.backgroundColor = "red"; // this code doesn't work
javascript dom jsdom
asked Nov 25 '18 at 3:27
Abdullah MorsyAbdullah Morsy
62
remove thediv.main. So change your second selector todocument.querySelector("div.user-panel.main input[name='login']")
– Nick Parsons
Nov 25 '18 at 3:30
add a comment |
when I put div.main as a separated condition the code doesn't work
<div class="user-panel main">
<input type="text" name="login">
</div>
document.querySelector("div.user-panel.main input[name='login']").style.backgroundColor = "red"; // this code works
document.querySelector("div.user-panel div.main input[name='login']").style.backgroundColor = "red"; // this code doesn't work
javascript dom jsdom
asked Nov 25 '18 at 3:27
Abdullah MorsyAbdullah Morsy
62
when I put div.main as a separated condition the code doesn't work
<div class="user-panel main">
<input type="text" name="login">
</div>
document.querySelector("div.user-panel.main input[name='login']").style.backgroundColor = "red"; // this code works
document.querySelector("div.user-panel div.main input[name='login']").style.backgroundColor = "red"; // this code doesn't work
javascript dom jsdom
javascript dom jsdom
asked Nov 25 '18 at 3:27
Abdullah MorsyAbdullah Morsy
62
asked Nov 25 '18 at 3:27
Abdullah MorsyAbdullah Morsy
62
asked Nov 25 '18 at 3:27
Abdullah MorsyAbdullah Morsy
62
asked Nov 25 '18 at 3:27
Abdullah MorsyAbdullah Morsy
62
asked Nov 25 '18 at 3:27
Abdullah MorsyAbdullah Morsy
62
62
remove thediv.main. So change your second selector todocument.querySelector("div.user-panel.main input[name='login']")
– Nick Parsons
Nov 25 '18 at 3:30
add a comment |
remove thediv.main. So change your second selector todocument.querySelector("div.user-panel.main input[name='login']")
– Nick Parsons
Nov 25 '18 at 3:30
remove the
div.main. So change your second selector to document.querySelector("div.user-panel.main input[name='login']")– Nick Parsons
Nov 25 '18 at 3:30
remove the
div.main. So change your second selector to document.querySelector("div.user-panel.main input[name='login']")– Nick Parsons
Nov 25 '18 at 3:30
add a comment |
2 Answers
2
active
oldest
votes
When your selectors are combined with a space - a descendant combinator - it's called a descendant selector. So
document.querySelector("div.user-panel div.main input[name='login']")
is looking for a input[name='login'] inside a div.main inside a div.user-panel.
Since in your html it's just a single div with 2 classes, this selector doesn't find anything.
It would work, however, if your html was looking like this:
<div class="user-panel">
<div class="main">
<input type="text" name="login">
</div>
</div>
answered Nov 25 '18 at 3:34
shkapershkaper
1,3511814
add a comment |
A space in a query selector denotes one element is inside another. The second line is looking for input[name='login'] contained in div.main, which is contained within another div (div.user-panel).
answered Nov 25 '18 at 3:40
tshimkustshimkus
819920
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
When your selectors are combined with a space - a descendant combinator - it's called a descendant selector. So
document.querySelector("div.user-panel div.main input[name='login']")
is looking for a input[name='login'] inside a div.main inside a div.user-panel.
Since in your html it's just a single div with 2 classes, this selector doesn't find anything.
It would work, however, if your html was looking like this:
<div class="user-panel">
<div class="main">
<input type="text" name="login">
</div>
</div>
answered Nov 25 '18 at 3:34
shkapershkaper
1,3511814
add a comment |
When your selectors are combined with a space - a descendant combinator - it's called a descendant selector. So
document.querySelector("div.user-panel div.main input[name='login']")
is looking for a input[name='login'] inside a div.main inside a div.user-panel.
Since in your html it's just a single div with 2 classes, this selector doesn't find anything.
It would work, however, if your html was looking like this:
<div class="user-panel">
<div class="main">
<input type="text" name="login">
</div>
</div>
answered Nov 25 '18 at 3:34
shkapershkaper
1,3511814
add a comment |
When your selectors are combined with a space - a descendant combinator - it's called a descendant selector. So
document.querySelector("div.user-panel div.main input[name='login']")
is looking for a input[name='login'] inside a div.main inside a div.user-panel.
Since in your html it's just a single div with 2 classes, this selector doesn't find anything.
It would work, however, if your html was looking like this:
<div class="user-panel">
<div class="main">
<input type="text" name="login">
</div>
</div>
answered Nov 25 '18 at 3:34
shkapershkaper
1,3511814
When your selectors are combined with a space - a descendant combinator - it's called a descendant selector. So
document.querySelector("div.user-panel div.main input[name='login']")
is looking for a input[name='login'] inside a div.main inside a div.user-panel.
Since in your html it's just a single div with 2 classes, this selector doesn't find anything.
It would work, however, if your html was looking like this:
<div class="user-panel">
<div class="main">
<input type="text" name="login">
</div>
</div>
answered Nov 25 '18 at 3:34
shkapershkaper
1,3511814
edited Nov 25 '18 at 3:51
answered Nov 25 '18 at 3:34
shkapershkaper
1,3511814
answered Nov 25 '18 at 3:34
shkapershkaper
1,3511814
answered Nov 25 '18 at 3:34
shkapershkaper
1,3511814
1,3511814
add a comment |
add a comment |
A space in a query selector denotes one element is inside another. The second line is looking for input[name='login'] contained in div.main, which is contained within another div (div.user-panel).
answered Nov 25 '18 at 3:40
tshimkustshimkus
819920
add a comment |
A space in a query selector denotes one element is inside another. The second line is looking for input[name='login'] contained in div.main, which is contained within another div (div.user-panel).
answered Nov 25 '18 at 3:40
tshimkustshimkus
819920
add a comment |
A space in a query selector denotes one element is inside another. The second line is looking for input[name='login'] contained in div.main, which is contained within another div (div.user-panel).
answered Nov 25 '18 at 3:40
tshimkustshimkus
819920
A space in a query selector denotes one element is inside another. The second line is looking for input[name='login'] contained in div.main, which is contained within another div (div.user-panel).
answered Nov 25 '18 at 3:40
tshimkustshimkus
819920
answered Nov 25 '18 at 3:40
tshimkustshimkus
819920
answered Nov 25 '18 at 3:40
tshimkustshimkus
819920
answered Nov 25 '18 at 3:40
tshimkustshimkus
819920
819920
add a comment |
add a comment |
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remove the
div.main. So change your second selector todocument.querySelector("div.user-panel.main input[name='login']")– Nick Parsons
Nov 25 '18 at 3:30