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How to modify css style with javascript

青灯夜游

Release： 2023-01-07 11:47:41

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Modification method: 1. Use "Element.style.Attribute name="value""; 2. Use "Element.setAttribute('Attribute name','Value')"; 3. Use "Element. setAttribute('style','Attribute name: value')"; 4. Use "element.className='value'".

How to modify css style with javascript

The operating environment of this tutorial: windows7 system, javascript version 1.8.5, Dell G3 computer.

1. Directly set the attribute of style In some cases, use this setting! important value is invalid

If the attribute has a '-' sign, write it in camel case (such as textAlign) If you want to retain the - sign, use the form of square brackets element.style['text-align'] = '100px';

element.style.height = &#39;100px&#39;;

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2. Set the attribute directly (can only be used For some attributes, related styles will be automatically recognized)

element.setAttribute(&#39;height&#39;, 100);
element.setAttribute(&#39;height&#39;, &#39;100px&#39;);

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3. Set the attributes of style

element.setAttribute(&#39;style&#39;, &#39;height: 100px !important&#39;);

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4. Use setProperty If you want to set !important, it is recommended to use this method to set the third parameter

element.style.setProperty(&#39;height&#39;, &#39;300px&#39;, &#39;important&#39;);

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5. Change class, such as JQ’s change class related method

Because JS cannot obtain the pseudo-element of css, so you can dynamically change the style of the pseudo-element by changing the class of the pseudo-element's parent

element.className = &#39;blue&#39;;
element.className += &#39;blue fb&#39;;

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6. Set cssText

element.style.cssText = &#39;height: 100px !important&#39;;
element.style.cssText += &#39;height: 100px !important&#39;;

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7. Create and introduce new css style files

  function addNewStyle(newStyle) {
            var styleElement = document.getElementById(&#39;styles_js&#39;);

            if (!styleElement) {
                styleElement = document.createElement(&#39;style&#39;);
                styleElement.type = &#39;text/css&#39;;
                styleElement.id = &#39;styles_js&#39;;
                document.getElementsByTagName(&#39;head&#39;)[0].appendChild(styleElement);
            }
            
            styleElement.appendChild(document.createTextNode(newStyle));
        }

        addNewStyle(&#39;.box {height: 100px !important;}&#39;);

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8. Use addRule and insertRule

// 在原有样式操作
        document.styleSheets[0].addRule(&#39;.box&#39;, &#39;height: 100px&#39;);
        document.styleSheets[0].insertRule(&#39;.box {height: 100px}&#39;, 0);

        // 或者插入新样式时操作
        var styleEl = document.createElement(&#39;style&#39;),
            styleSheet = styleEl.sheet;

        styleSheet.addRule(&#39;.box&#39;, &#39;height: 100px&#39;);
        styleSheet.insertRule(&#39;.box {height: 100px}&#39;, 0);

        document.head.appendChild(styleEl);

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[Recommended learning: javascript Advanced Tutorial】

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