焦点输入框在负载下
[英]Focus Input Box On Load
问题描述
How can the cursor be focus on a specific input box on page load? 
如何在页面加载时将光标聚焦在特定的输入框上？
Is it posible to retain initial text value as well and place cursor at end of input? 是否还可以保留初始文本值并将光标放在输入的末尾？
<input type="text" size="25" id="myinputbox" class="input-text" name="input2" value = "initial text" />
11 个解决方案
解决方案1
159 已采纳 2010-12-02 02:09:33
There are two parts to your question. 您的问题分为两部分。
1) How to focus an input on page load? 1）如何将输入集中在页面加载上？
You can just add the autofocus attribute to the input. 您可以仅将autofocus属性添加到输入中。
<input id="myinputbox" type="text" autofocus>
However, this might not be supported in all browsers, so we can use javascript. 但是，并非所有浏览器都支持此功能，因此我们可以使用javascript。
window.onload = function() {
var input = document.getElementById("myinputbox").focus();
}
2) How to place cursor at the end of the input text? 2）如何将光标置于输入文本的末尾？
Here's a non-jQuery solution with some borrowed code from another SO answer . 这是一个非jQuery解决方案，其中的一些代码是从另一个SO答案中借来的。
function placeCursorAtEnd() {
if (this.setSelectionRange) {
// Double the length because Opera is inconsistent about
// whether a carriage return is one character or two.
var len = this.value.length * 2;
this.setSelectionRange(len, len);
} else {
// This might work for browsers without setSelectionRange support.
this.value = this.value;
}
if (this.nodeName === "TEXTAREA") {
// This will scroll a textarea to the bottom if needed
this.scrollTop = 999999;
}
};
window.onload = function() {
var input = document.getElementById("myinputbox");
if (obj.addEventListener) {
obj.addEventListener("focus", placeCursorAtEnd, false);
} else if (obj.attachEvent) {
obj.attachEvent('onfocus', placeCursorAtEnd);
}
input.focus();
}
Here's an example of how I would accomplish this with jQuery. 这是我如何使用jQuery完成此操作的示例。
<input type="text" autofocus>
<script>
$(function() {
$("[autofocus]").on("focus", function() {
if (this.setSelectionRange) {
var len = this.value.length * 2;
this.setSelectionRange(len, len);
} else {
this.value = this.value;
}
this.scrollTop = 999999;
}).focus();
});
</script>
解决方案2
45 2010-12-02 02:16:16
Just a heads up - you can now do this with HTML5 without JavaScript for browsers that support it: 请注意-您现在可以在不支持JavaScript的HTML5上针对支持它的浏览器执行此操作：
<input type="text" autofocus>
You probably want to start with this and build onto it with JavaScript to provide a fallback for older browsers. 您可能想从此开始，并使用JavaScript构建它，以为较旧的浏览器提供后备功能。
解决方案3
10 2013-10-10 09:16:23
$(document).ready(function() {
$('#id').focus();
});
解决方案4
3 2010-12-02 02:15:13
function focusOnMyInputBox(){
document.getElementById("myinputbox").focus();
}
<body onLoad="focusOnMyInputBox();">
<input type="text" size="25" id="myinputbox" class="input-text" name="input2" onfocus="this.value = this.value;" value = "initial text">
解决方案5
2 2010-12-02 02:15:35
A portable way of doing this is using a custom function (to handle browser differences) like this one . 这样做的一个可移植的方法是使用自定义函数（处理浏览器的差异），像这一个 。
Then setup a handler for the onload at the end of your <body> tag, as jessegavin wrote: 然后，如jessegavin所写，在<body>标记的末尾为onload设置一个处理程序：
window.onload = function() {
document.getElementById("myinputbox").focus();
}
解决方案6
1 2016-04-14 09:59:51
Working fine... 工作正常...
window.onload = function() {
var input = document.getElementById("myinputbox").focus();
}
解决方案7
1 2019-05-17 01:35:43
非常简单的一线解决方案：
<body onLoad="document.getElementById('myinputbox').focus();">
解决方案8
0 2014-08-18 22:52:09
This is what works fine for me: 这对我来说很好：
<form name="f" action="/search">
<input name="q" onfocus="fff=1" />
</form>
fff will be a global variable which name is absolutely irrelevant and which aim will be to stop the generic onload event to force focus in that input. fff将是一个全局变量，其名称绝对无关紧要，其目的是停止通用的onload事件，以强制将焦点集中在该输入上。
<body onload="if(!this.fff)document.f.q.focus();">
<!-- ... the rest of the page ... -->
</body>
From: http://webreflection.blogspot.com.br/2009/06/inputfocus-something-really-annoying.html 来自： http : //webreflection.blogspot.com.br/2009/06/inputfocus-something-really-annoying.html
解决方案9
0 2014-08-22 14:04:43
If you can't add to the BODY tag for some reason, you can add this AFTER the Form: 如果由于某种原因而无法添加到BODY标签，则可以在表单之后添加此标签：
<SCRIPT type="text/javascript">
document.yourFormName.yourFieldName.focus();
</SCRIPT>
解决方案10
0 2017-11-21 10:55:57
Try: 尝试：
Javascript Pure: Javascript Pure：
[elem][n].style.visibility='visible';
[elem][n].focus();
Jquery: jQuery：
[elem].filter(':visible').focus();
解决方案11
0 2019-11-26 18:18:18
Add this to the top of your js 将此添加到您的js顶部
var input = $('#myinputbox');
input.focus();
Or to html 或HTML
<script>
var input = $('#myinputbox');
input.focus();
</script>
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