CODEWITHSUNDEEP
javascriptreactjs
Fellow Stranger
Fellow Stranger

Reputation: 34013

Convert jQuery click/drag code to React

With the code below, taken from this SO answer, a user can select cells vertically in a grid by click-and-drag.

I intend to use this functionality in React and thus need to convert it to a component.

How would one change the method-chaining and selector based structure to React?

Working example with jquery

--HTML--

<table cellpadding="0" cellspacing="0" id="our_table">
  <tr>
    <td data-row="1" data-col="1">a</td>
    <td data-row="1" data-col="2">b</td>
    <td data-row="1" data-col="3">c</td>
  </tr>
  <tr>
    <td data-row="2" data-col="1">d</td>
    <td data-row="2" data-col="2">e</td>
    <td data-row="2" data-col="3">f</td>
  </tr>
  <tr>
    <td data-row="3" data-col="1">g</td>
    <td data-row="3" data-col="2">h</td>
    <td data-row="3" data-col="3">i</td>
  </tr>
</table>

--CSS--

table td {
  width:100px;
  height:100px;
  text-align:center;
  vertical-align:middle;
  background-color:#ccc;
  border:1px solid #fff;
}

table td.highlighted {
  background-color:#999;
}

--jQuery--

$(function () {
  var isMouseDown = false,
    isHighlighted;
 var currentCol;
  $("#our_table td")
    .mousedown(function () {
      isMouseDown = true;
      currentCol = this.getAttribute("data-col");
      $(this).toggleClass("highlighted");
      isHighlighted = $(this).hasClass("highlighted");
      return false; // prevent text selection
    })
    .mouseover(function () {
      if (isMouseDown) {
          if(currentCol === this.getAttribute("data-col")){
              $(this).toggleClass("highlighted", isHighlighted);
          }
      }
    })
    .bind("selectstart", function () {
      return false;
    })

  $(document)
    .mouseup(function () {
      isMouseDown = false;
    });
});

Upvotes: 1

Views: 196

Answers (1)

robi24
robi24

Reputation: 606

All what you need is in React Event System docs. onMouseDown, onMouseUp and onMouseOver are the most interesting event handlers for you. I created Similar Example.

In componentWillReceiveProps function I check if the cell should update their own state and I use shouldComponentUpdate to prevent rendering the component if it's not needed (it's very important when you have a lot of cells). The main state is in Hello (parent) component: overId contains cell data, startedId contains starting cell and enableSelect is true when we start selection.

It's "similar" because I didn't check your example carefully, but I think it's good enough to show you how it's works.

Upvotes: 1

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