Question

我有一个文本框，我想设置焦点，但它不起作用。

document.getElementById("txtCity").focus();

有什么想法吗？

Answer 1

也许你在渲染输入元素之前调用JavaScript？将输入元素放在JavaScript之前或等到页面加载后再触发JavaScript。

按顺序，它可以正常工作：

<input type="text" id="test" />
<script type="text/javascript">
  document.getElementById("test").focus();
</script>

在jQuery中，您可以将代码放在.ready()方法中，以便在DOM完全加载时首先执行代码：

<script type="text/javascript" src="jquery.min.js"></script>
<script type="text/javascript">
  $(document).ready(function () {
    $("#test").focus();
    // document.getElementById("test").focus();
  });
</script>

Answer 2

在这个例子中它工作正常 http://jsfiddle.net/lmcculley/rYfvQ/

Answer 3

    <div id="txtROSComments" contenteditable="true" onkeyup="SentenceCase(this, event)"style="border: 1px solid black; height: 200px; width: 200px;">
    </div>
    <script type="text/javascript">
        function SentenceCase(inField, e) {
            debugger;
            var charCode;

            if (e && e.which) {
                charCode = e.which;
            } else if (window.event) {
                e = window.event;
                charCode = e.keyCode;
            }

            if (charCode == 190) {
                format();
            }
        }

        function format() {
            debugger; ;
            var result = document.getElementById('txtROSComments').innerHTML.split(".");

            var finaltxt = "";


            var toformat = result[result.length - 2];

            result[0] = result[0].substring(0, 1).toUpperCase() + result[0].slice(1);

            if (toformat[0] != " ") {

                for (var i = 0; i < result.length - 1; i++) {
                    finaltxt += result[i] + ".";
                }

                document.getElementById('txtROSComments').innerHTML = finaltxt;
                alert(finaltxt);
                abc();
                return finaltxt;
            }



            if (toformat[0].toString() == " ") {
                debugger;
                var upped = toformat.substring(1, 2).toUpperCase();

                var formatted = " " + upped + toformat.slice(2);

                for (var i = 0; i < result.length - 1; i++) {

                    if (i == (result.length - 2)) {
                        finaltxt += formatted + ".";
                    }
                    else {
                        finaltxt += result[i] + ".";
                    }

                }
            }
            else {
                debugger;
                var upped = toformat.substring(0, 1).toUpperCase();

                var formatted = " " + upped + toformat.slice(1);



                for (var i = 0; i < result.length - 1; i++) {
                    if (i == (result.length - 2)) {
                        finaltxt += formatted + ".";
                    }
                    else {
                        //if(i
                        finaltxt += result[i] + ".";
                    }

                }

            }
            debugger;
            document.getElementById('txtROSComments').value = finaltxt;
            return finaltxt;

        }

    </script>
   <script type="text/javascript">
       function abc() {
           document.getElementById("#txtROSComments").focus();
       }

Answer 4

我也遇到了同样的问题。要解决此问题，请将代码放在setTimeout函数中。

function showMeOnClick() {
    // Set text filed focus after some delay
    setTimeout(function() { jQuery('#searchTF').focus() }, 20);
    // Do your work.....
}

Answer 5

尝试将其包装到文档就绪函数中并确保包含jquery。

    <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.4.4/jquery.min.js"></script>
    <script>
       $(document).ready(function() {
          $("#test").focus();
       });
    </script>

Javascript Focus（）函数无法正常工作

5 个答案: