如何在html div中获取数据值？

Question

I can get all entries' attribute like style display in the div. but I can't get the data-value from the same way. I need find a correct syntax to get the all data-value entries.

  $.ajax({
      url:"{{ url_for('fetch_bar') }}",
      type:"post",
      dataType: "json",
      async: true,
      success:function(response){
        var response = JSON.parse(response);
        var len = Object.keys(response).length;

        var selects = document.querySelectorAll("select[id=select_host]");
        var bars = document.querySelectorAll("[id=ldBar]");
        if (len == 1) {
           ....
        }
        else if (len > 1)
          for( var ind = 0; ind < len; ind++){
            for (var index = 0; index < selects.length ; index++)
              if (selects[index].value == response[ind].hostname)
                // alert(bars[index].style.display)
                alert(bars[index].data-value)
                // alert(bars[index].[data-value])

                  <td>

                        <input id="stage" type="button" class="btn-primary" onclick="readTextFile();"  name="stage" value="{{entry.stage}}" >
                        <div id="ldBar" class="ldBar label-center" data-value="0" data-preset="stripe" data-aspect-ratio="none" style="width:100%;display: block;" ></div>
                  </td>
                  <td>

Answer 1

使用.getAttribute("data-value")获取值

 console.log(document.querySelector('#ldBar').getAttribute("data-value")) 

  <div id="ldBar" class="ldBar label-center" data-value="0" data-preset="stripe" data-aspect-ratio="none" style="width:100%;display: block;" ></div> 

Answer 2

If you want to get data-value of the element with jQuery:

 console.log($("div").data("value")); 

 <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <div data-value=10><div> 

Vanilla JS:

 console.log(document.querySelector('div').getAttribute("data-value")); 

 <div data-value=10></div> 

Dataset:

 console.log(document.querySelector('div').dataset.value); 

 <div data-value=10><div> 

Answer 3

If you have event then you can simply use it by:

const { dataset: { value }} = e.target;

or you can directly get it by using JQuery:

$("#your_element_id").data("value")

Answer 4

To get the data attribute from an element using jQuery use this syntax:

$("#your_element_id").data("value")

Just note that if you write it like this in your html: <div id='test' data-testID='1'></div>

In jQuery you will access it like this:

$("#test").data("testid");

As all the data properties are returned as lowercase

Answer 5

You can use dataset , like this:

 const ldBar = document.getElementById("ldBar") console.log( ldBar.dataset.value, ldBar.dataset.preset, ldBar.dataset.aspectRatio // Note the conversion to camelCase ); 

 <div id="ldBar" class="ldBar label-center" data-value="0" data-preset="stripe" data-aspect-ratio="none" style="width:100%; display: block;" ></div> 

(See: https://developer.mozilla.org/en-US/docs/Learn/HTML/Howto/Use_data_attributes )

Answer 6

HTML CODE:

<td>
    <input id="stage" type="button" class="btn-primary" onclick="readTextFile();"  name="stage" value="{{entry.stage}}" >
    <div id="ldBar" class="ldBar label-center" data-value="0" data-preset="stripe" data-aspect-ratio="none" style="width:100%;display: block;" ></div>
</td>

JS CODE:

var abc = $('td').find('#ldBar').attr('data-value');