使用Javascript单击按钮来启用和禁用下拉列表? [英] Toggle dropdownlist enable and disable with a button click using Javascript?

问题描述

我使用以下 JavaScript 来禁用 ASP.NET 页面中的下拉列表，当我单击按钮时会调用该下拉列表.

I have the following JavaScript to disable a dropdownlist in a ASP.NET page, which gets called when I click a button.

function disableDropDown(DropDownID)
{
  document.getElementById(DropDownID).disabled = true;
  return false; 
}

我想使用相同的按钮在该下拉列表的启用和禁用之间切换.我该怎么做?

I wanted to use the same button to toggle between enable and disable for that dropdownlist. How do I do this?

推荐答案

你只需要反转布尔值 disabled 属性:

You just have to invert the boolean disabled attribute:

function toggleDisableDropDown(dropDownID) {
  var element = document.getElementById(dropDownID); // get the DOM element

  if (element) { // element found
    element.disabled = !element.disabled; // invert the boolean attribute
  }

  return false; // prevent default action
}

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