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Detailed introduction of H5data-* attributes

零下一度

Jul 18, 2017 pm 01:34 PM

html5 question

H5 added data-* attributes, which is very convenient

data-* attributes: Custom attributes to store data, data-value, the value can be any string.

Get the value:

1 2	`var` `el = document.getElementById('div')` `console.log(el.getAttribute('data-created-time'))`

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Set the value:

1 2	`var` `el = document.getElementById('div')` `el.setAttribute('data-created-time','星期一')`

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js can use the dataset attribute to access the value of the data-attribute

<div id=&#39;div&#39; data-mei=&#39;47&#39; data-tree-height=&#39;2.4m&#39;></div>    
var div= document.getElementById(&#39;tree&#39;)    
console.log(div.dataset.mei) // &#39;47&#39;   获取值    
console.log(tree.dataset.treeHeight) // &#39;2.4m&#39;    
tree.dataset.plantHeight = &#39;3m&#39;  //设置值

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Use obj.data in jQuery ("property value") Gets and sets the value of data.

But the problem of lower case is often ignored. H5 requires all attribute names to be lower case. The habit of camel case naming is broken.

The test code is as follows:

<html><head><script type="text/javascript" src="jquery-1.9.1.js?1.1.11"></script><script type="text/javascript">$(document).ready(function(){
  $("#btn2").click(function(){
    alert($("div").data("id"));
    alert($("div").data("Id"));
    alert($("div").data("otherId"));
    alert($("div").data("OtherId"));
    alert($("div").data("OTHERID"));var datas = $("div").data();
  });
});</script></head><body><button id="btn2">alert</button><div  data-id="小写id" data-Id="大写ID" data-otherId="驼峰id" data-other-id="横线id"></div></body></html>

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## The value from #alert is unexpected. After obtaining all data values through the data() method, you can see the following results:

Summary: Follow the standards Writing method

1. data-* All characters must be lowercase.

2. Multiple words are separated by horizontal lines. For example,

data-other-id => otherId will remove the horizontal lines and capitalize the first letter when reading the attribute.

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