Question

setTimeout如何为选择表单输入保存和加载数据？我试图让它与事件监听器一起工作。我检查了捕获＆amp;泡沫，我仍然试图包裹我的脑袋。

我需要它来设置或获取从输入字段分配给各个元素的值，具体取决于字段上是否有焦点或模糊等变化。

我错过了哪个功能或步骤，我应该从哪里开始寻找？

    answers = document.getElementsByName('answers[]');
for(var i = 0; i < answers.length; i++) {
  nodeIndex = 'answer' + i;
  if(answers[i] == ''){
    answers[i].addEventListener('blur', function(){
      localStorage.setItem(nodeIndex, answers[i].value);
    });
  }
  else {
    answers[i].addEventListener('focus', function(){
      answers[i].value = localStorage.getItem(nodeIndex);
      localStorage.setItem(nodeIndex, answers[i].value);
    });
    answers[i].addEventListener('blur', function(){        
      localStorage.setItem(nodeIndex, answers[i].value);
      answers[i].value = localStorage.getItem(nodeIndex);
    });
  } // end if

} // end forloop

REVISED 我注意到只有最后一个元素受到影响。当我在答案[0]中输入文本到答案[14]时，它们的值被保存并设置/复制到最后一个元素。我怎么用错了？我读了，似乎遵守规则......

    function processAnswers(i, answers) {
  setTimeout(function() {
    nodeIndex = 'answer' + i;          
    if(localStorage.getItem(nodeIndex) === null) {

      answers[i].addEventListener('blur', function(){
        localStorage.setItem(nodeIndex, answers[i].value);
      });

    } // end if
    else {

      answers[i].addEventListener('focus', function(){
        answers[i].value = localStorage.getItem(nodeIndex);
        localStorage.setItem(nodeIndex, answers[i].value);

      });
      answers[i].addEventListener('blur', function(){        
        localStorage.setItem(nodeIndex, answers[i].value);
        answers[i].value = localStorage.getItem(nodeIndex);
      });

    } // end else
  }, 100); // end setTimeout()
} // end processAnswers();

 answers = document.getElementsByName('answers[]'); 
 for(var i = 0; i < answers.length; i++) {
   processAnswers(i, answers);
 }

我的代码失控了。我决定重新开始并保持简单......它有效！

var answers;
var clearAnswersBtn;
var clearAnswers;

var MainLoop = function MainLoopFunction(){

  answers = document.getElementsByName('answers[]');
  clearAnswersBtn = document.getElementsByTagName('body')[0];
  clearAnswersBtn.innerHTML = clearAnswersBtn.innerHTML + '<button id="clearanswers" style="position:fixed;bottom:0;right:0;padding:5px;margin:0 10px 10px 0;z-index:99999">Clear Saved Answers</button>';

  clearAnswers = document.getElementById('clearanswers');

  clearAnswers.addEventListener("click", function(){
    localStorage.clear();
    alert("Answers Cleared!");
  });

  function saveAnswers(i, answer){
    if(localStorage.getItem(i)) {
      answer.value = localStorage.getItem(i);
    }
    else {
      answer.addEventListener("blur", function(){
    if(!localStorage.getItem(i)) {
      localStorage.setItem(i, answer.value);
    }      
      });
    }
  } // end saveAnswers()

  setTimeout(function(){
    for( var i = 0; i < answers.length; i++) {
      saveAnswers(i, answers[i]);
    }
  }, 0)
}();

如果浏览器崩溃，setTimeout如何保存并加载数据以形成输入，我再次访问同一页面？

0 个答案: