javascript - 焦点不适用于文本区域

Question

我正在创建一个页面，用户可以在其中添加问题及其解决方案，他可以删除问题，还可以使用 javascript 中的 DOM 对其进行动态编辑。我希望每当用户点击编辑按钮时，出现的文本框都会自动对焦。

这是我页面的 javascript 代码...

var questionText;
var answerText;
var questionArray=[];
var answerArray=[];
var i=0;
var j=10000;

function addProblem(){
    var body = document.getElementsByTagName('body')[0];
    questionText = document.getElementById('questionId').value;
    answerText = document.getElementById('answerId').value;

    questionArray.unshift(questionText);
    answerArray.unshift(answerText);

    var myContainer = document.getElementById('container');
    var myDiv = document.createElement("div");
    var questionLogo = document.createElement("p");
    questionLogo.id = "questionLogo";
    var textNode = document.createTextNode("Question:");
    var question = document.createElement("p");
    question.id = "question";
    var questionDetail = document.createTextNode(questionArray[0]);

    var deleteButton = document.createElement("button");
    deleteButton.innerHTML = "Delete";
    deleteButton.id = i;
    var editButton = document.createElement("button");
    editButton.innerHTML = "Edit";
    editButton.id = j;

    var answerLogo = document.createElement("p");
    answerLogo.id = "answerLogo"
    var ansTextNode = document.createTextNode("Answer: ");
    var answer = document.createElement("p");
    answer.id = "answer";
    var answerDetail = document.createTextNode(answerArray[0]);
    var mybr = document.createElement("br");

    if(i==0){
        myContainer.appendChild(myDiv);
        myDiv.appendChild(questionLogo);
        questionLogo.appendChild(textNode);
        questionLogo.appendChild(question);
        question.appendChild(questionDetail);
        myDiv.appendChild(answerLogo);
        answerLogo.appendChild(ansTextNode);
        answerLogo.appendChild(answer);
        answer.appendChild(answerDetail);
        answerLogo.appendChild(mybr);
        myDiv.appendChild(deleteButton);
        myDiv.innerHTML += ' ';
        myDiv.appendChild(editButton);
    }
    else if (i > 0)
    {
        myContainer.insertBefore(myDiv,myContainer.firstChild);
        myDiv.appendChild(questionLogo);
        questionLogo.appendChild(textNode);
        questionLogo.appendChild(question);
        question.appendChild(questionDetail);
        myDiv.appendChild(answerLogo);
        answerLogo.appendChild(ansTextNode);
        answerLogo.appendChild(answer);
        answer.appendChild(answerDetail);
        answer.appendChild(mybr);
        myDiv.appendChild(deleteButton);
        myDiv.innerHTML += ' ';
        myDiv.appendChild(editButton);
    }

    i++;
    j++;

    myDiv.childNodes[7].addEventListener("click", function(){
        var deleteElement = document.getElementById(this.id);
        deleteElement.parentNode.parentNode.removeChild(deleteElement.parentNode);
    });

    myDiv.childNodes[9].addEventListener("click",function(){
         var editElement = document.getElementById(this.id);
         var quesEdit = editElement.parentNode.childNodes[1];
         var quesEditText = quesEdit.innerHTML;

         var ansEdit = editElement.parentNode.childNodes[4];
         var ansEditText = ansEdit.innerHTML;

         var editDiv1 = document.createElement("div");
         editDiv1.id = "editDiv1"
         var quesTextArea = document.createElement("textarea");
         quesTextArea.innerHTML += quesEditText;
         quesTextArea.focus();
         var saveButton1 = document.createElement("button");
         saveButton1.innerHTML = "Save";
         editDiv1.appendChild(quesTextArea);
         editDiv1.innerHTML += ' ';
         editDiv1.appendChild(saveButton1);
         quesEdit.parentNode.replaceChild(editDiv1,quesEdit);

         var editDiv2 = document.createElement("div");
         editDiv2.id = "editDiv2"
         var ansTextArea = document.createElement("textarea");
         ansTextArea.innerHTML += ansEditText;
         var saveButton2 = document.createElement("button");
         saveButton2.innerHTML = "Save";
         editDiv2.appendChild(ansTextArea);
         editDiv2.innerHTML += ' ';
         editDiv2.appendChild(saveButton2);
         ansEdit.parentNode.replaceChild(editDiv2,ansEdit);
    });
}

我尝试使用quesTextArea.focus();但它在 questextArea 是文本区域名称的地方不起作用。请帮助我如何做到这一点。

Answer 1

要使元素获得焦点，当您对其调用焦点时，它必须在 DOM 中。您应该在 replaceChild 函数之后调用 focus 函数

 editDiv1.appendChild(quesTextArea);
 editDiv1.appendChild(saveButton1);
 quesEdit.parentNode.replaceChild(editDiv1,quesEdit);
 quesTextArea.focus();

我已经创建了一个简单的示例如下链接，你可以查看它
https://jsfiddle.net/pd9c6c7a/3/