CSS-velgere
CSS-velgere er ryggraden i enhver stilig nettside. De målretter HTML-elementer på sidene dine, slik at du kan legge til stiler basert på deres id, klasse, type, attributt og mer. Denne guiden vil fordype seg i detaljene til CSS-velgere og deres sentrale rolle i å forbedre estetikken og brukeropplevelsen til nettsidene dine.
Typer CSS-velgere
CSS-velgere kommer i forskjellige typer, hver med sin unike måte å velge HTML-elementer på. La oss utforske dem:
| CSS-velgere | Beskrivelse |
|---|---|
| Enkle velgere | Den brukes til å velge HTML-elementer basert på elementnavn, id, attributter osv |
| Universalvelger | Velger alle elementene på siden. |
| Attributtvelger | Målretter mot elementer basert på deres attributtverdier. |
| Pseudo-klassevelger | Velger elementer basert på deres tilstand eller posisjon, som f.eks :hover> for sveveeffekter. |
| Kombinatorvelgere | Kombiner velgere for å spesifisere relasjoner mellom elementer, for eksempel etterkommere ( > ) eller barn ( >> ). |
| Pseudo-elementvelger | Velger spesifikke deler av et element, som f.eks ::before> eller ::after> . |
Innholdsfortegnelse
- CSS-velgertyper
- Enkle velgere
- Elementvelger
- ID-velger
- Klassevelger
- Universalvelger
- Gruppevelger
- Attributtvelger
- Pseudo-klassevelger
- Pseudo-elementvelger
Enkle velgere
Enkle velgere inneholder klassene nedenfor.
| Enkel velger | Beskrivelse |
|---|---|
| Elementvelger | Velger HTML-elementer basert på tagnavnene deres. |
| ID-velger | Målretter mot et HTML-element med et spesifikt id-attributt. |
| Klassevelger | Velger elementer med et bestemt klasseattributt. |
Eksempel: I dette eksemplet vil vi skrive koden for å forstå velgere og deres bruk på en bedre måte.
HTML CSS-velgertittel> <link rel='stylesheet' href='style.css' />hodet> <body> <h1>Eksempel Headingh1> <p>Dette er innhold i første avsnittp> <div id='div-container'>Dette er en div med id div-container div> <p>Dette er et avsnitt med klassen avsnitt-klasse p> body> html> </pre> </code> <p dir='ltr'> <b> <strong>Merk: </strong> </b> <span>Vi vil bruke CSS-regler på eksemplet ovenfor. </span> </p> <h2 id='element-selector'> <b> <strong>Elementvelger </strong> </b> </h2> <p dir='ltr'> <span>De </span> <span>elementvelger </span> <span>velger HTML-elementer basert på elementnavnet (eller taggen), for eksempel p, h1, div, span, etc. </span> </p> <p dir='ltr'> <b> <strong>MERK : </strong> </b> <span>Følgende kode brukes i eksemplet ovenfor. Du kan se CSS-reglene som gjelder for alle </span> <span> </span> </p> <p> <span>tagger og </span> </p> <h1>tagger. <p> </p> </h1> <h3> <b> <strong>CSS: </strong> </b> </h3> <pre>h1 { color: red; font-size: 3rem; } p { color: white; background-color: gray; } </pre> <p dir='ltr'> <b> <strong>Produksjon: </strong> </b> </p> <img src='//techcodeview.com/img/css-questions/50/css-selectors.webp' alt='CSS-Element-Velgere-Eksempel-utgang'> <p>CSS Element Selector-utgang </p> <h2 id='id-selector'> <b> <strong>ID-velger </strong> </b> </h2> <p dir='ltr'> <span>De </span> <b> <strong>id-velger </strong> </b> <span>bruker </span> <i> <em>id-attributt </em> </i> <span>av et HTML-element for å velge et spesifikt element. </span> <b> <strong> </strong> </b> <span>An </span> <b> <strong>id </strong> </b> <span>av elementet er unikt på en side som skal brukes </span> <b> <strong>id </strong> </b> <span>velger. </span> </p> <p dir='ltr'> <b> <strong>Merk: </strong> </b> <span>Følgende kode brukes i eksemplet ovenfor ved å bruke id-velgeren. </span> </p> <h3> <b> <strong>CSS: </strong> </b> </h3> <pre>#div-container{ color: blue; background-color: gray; } </pre> <p dir='ltr'> <b> <strong>Produksjon: </strong> </b> </p> <img src='//techcodeview.com/img/css-questions/50/css-selectors-2.webp' alt='CSS-Id-selektorer-eksempel-utgang'> <p>CSS ID Selectors eksempel utgang </p> <h2 id='class-selector'> <b> <strong>Klassevelger </strong> </b> </h2> <p dir='ltr'> <span>De </span> <b> <strong>klassevelger </strong> </b> <span>velger HTML-elementer med et spesifikt klasseattributt. </span> </p> <p dir='ltr'> <b> <strong>Merk: </strong> </b> <span>Følgende kode brukes i eksemplet ovenfor ved å bruke klassevelgeren. For å bruke en klassevelger må du bruke ( . ) etterfulgt av klassenavn i CSS. Denne regelen vil bli brukt på HTML-elementet med klasseattributtet </span> <i> <em>avsnittsklasse </em> </i> <span> </span> </p> <h3> <b> <strong>CSS: </strong> </b> </h3> <pre>.paragraph-class { color:white; font-family: monospace; background-color: purple; } </pre> <p dir='ltr'> <b> <strong>Produksjon: </strong> </b> </p> <img src='//techcodeview.com/img/css-questions/50/css-selectors-3.webp' alt='CSS-Klasse-Velgere-Eksempel-Utgang'> <p>Eksempel på CSS-klassevelger </p> <h2 id='universal-selector'> <b> <strong>Universalvelger </strong> </b> </h2> <p dir='ltr'> <span>De </span> <span>Universalvelger </span> <span>(*) i CSS brukes til å velge alle elementene i et HTML-dokument. Det inkluderer også andre elementer som er inne under et annet element. </span> </p> <p dir='ltr'> <b> <strong>Merk: </strong> </b> <span>Følgende kode brukes i eksemplet ovenfor ved bruk av den universelle velgeren. Denne CSS-regelen vil bli brukt på hvert eneste HTML-element på siden: </span> </p> <h3> <b> <strong>CSS: </strong> </b> </h3> <pre>* { color: white; background-color: black; } </pre> <p dir='ltr'> <b> <strong>Produksjon: </strong> </b> </p> <img src='//techcodeview.com/img/css-questions/50/css-selectors-4.webp' alt='CSS-Universal-Velger-Eksempel-Utgang'> <p>CSS Universal Selector Eksempel utgang </p> <h2 id='group-selector'> <b> <strong>Gruppevelger </strong> </b> </h2> <p dir='ltr'> <span>De </span> <b> <strong>Gruppevelger </strong> </b> <span>brukes til å style alle kommaseparerte elementer med samme stil. </span> </p> <p dir='ltr'> <b> <strong>Merk: </strong> </b> <span>Anta at du vil bruke vanlige stiler på forskjellige velgere, i stedet for å skrive regler separat kan du skrive dem i grupper som vist nedenfor. </span> </p> <h3> <b> <strong>CSS: </strong> </b> </h3> <pre>#div-container, .paragraph-class, h1{ color: white; background-color: purple; font-family: monospace; } </pre> <p dir='ltr'> <b> <strong>Produksjon: </strong> </b> </p> <img src='//techcodeview.com/img/css-questions/50/css-selectors-5.webp' alt='CSS-Gruppe-Velger-Eksempel-Utgang'> <p>Eksempel på CSS-gruppevelger </p> <h2 id='attribute-selector'> <b> <strong>Attributtvelger </strong> </b> </h2> <p dir='ltr'> <span>De </span> <b> <strong>attributtvelger </strong> </b> <span>[attributt] brukes til å velge elementene med en spesifisert attributt eller attributtverdi. </span> </p> <p dir='ltr'> <b> <strong>Merk: </strong> </b> <span>Følgende kode brukes i eksemplet ovenfor ved å bruke attributtvelgeren. Denne CSS-regelen vil bli brukt på hvert eneste HTML-element på siden: </span> </p> <h3> <b> <strong>CSS: </strong> </b> </h3> <pre>[href] { background-color: lightgreen; color: black; font-family: monospace; font-size: 1rem; } </pre> <p dir='ltr'> <b> <strong>Produksjon: </strong> </b> </p> <img src='//techcodeview.com/img/css-questions/50/css-selectors-6.webp' alt='CSS-Attribut-Selectros-Example-Output'> <p>CSS Attribut Selectros Eksempel utdata </p> <h2 id='pseudoclass-selector'> <b> <strong>Pseudo-klassevelger </strong> </b> </h2> <p dir='ltr'> <span>Den brukes til å style en spesiell type tilstand av ethvert element. For eksempel- Det brukes til å style et element når en musepeker svever over det. </span> </p> <p dir='ltr'> <b> <strong>Merk: </strong> </b> <span>Vi bruker et enkelt kolon(:) i tilfelle av en </span> <span>Pseudo-klassevelger </span> <span>. </span> </p> <p dir='ltr'> <b> <strong>Syntaks: </strong> </b> </p> <pre>Selector:Pseudo-Class { Property: Value; } </pre> <h3> <b> <strong>CSS: </strong> </b> </h3> <pre>h1:hover{ background-color: aqua; } </pre> <p dir='ltr'> <b> <strong>Produksjon: </strong> </b> </p> <img src='//techcodeview.com/img/css-questions/50/css-selectors.webp' alt='CSS-Pseudo-velger-eksempel-utgang'> <p>CSS Pseudo Selector Eksempel utgang </p> <h2 id='pseudoelement-selector'> <b> <strong>Pseudo-elementvelger </strong> </b> </h2> <p dir='ltr'> <span>Den brukes til å style en hvilken som helst spesifikk del av elementet. For eksempel- Den brukes til å style den første bokstaven eller den første linjen i ethvert element. </span> </p> <p dir='ltr'> <b> <strong>Merk: </strong> </b> <span>Vi bruker et dobbelt kolon(::) når det gjelder en </span> <span>Pseudo-elementvelger </span> <span>. </span> </p> <p dir='ltr'> <b> <strong>Syntaks: </strong> </b> </p> <pre>Selector:Pseudo-Element{ Property:Value; } </pre> <h3> <b> <strong>CSS: </strong> </b> </h3> <pre>p::first-line{ background-color: goldenrod; } </pre> <p dir='ltr'> <b> <strong>Produksjon: </strong> </b> </p> <img src='//techcodeview.com/img/css-questions/50/css-selectors-7.webp' alt='CSS-Pseudo-Element-Velger-Eksempel-Utgang'> <p>CSS Pseudo-Element Selector Eksempel utgang </p> <p dir='ltr'> <br> </p> <br> <br>
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