Focus Input Box On Load

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How can the cursor be focus on a specific input box on page load?

Is it posible to retain initial text value as well and place cursor at end of input?

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11条回答

萌比男神i

2020-11-30 01:21
If you can't add to the BODY tag for some reason, you can add this AFTER the Form:
```
<SCRIPT type="text/javascript">
    document.yourFormName.yourFieldName.focus();
</SCRIPT>
```
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后悔当初

2020-11-30 01:23
A portable way of doing this is using a custom function (to handle browser differences) like this one.

Then setup a handler for the onload at the end of your <body> tag, as jessegavin wrote:
```
window.onload = function() {
  document.getElementById("myinputbox").focus();
}
```
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暗喜

2020-11-30 01:25

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">

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面向向阳花

2020-11-30 01:26

Working fine...

window.onload = function() {
  var input = document.getElementById("myinputbox").focus();
}

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你的背包

2020-11-30 01:26
This is what works fine for me:
```
<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.
```
<body onload="if(!this.fff)document.f.q.focus();">
    
</body>
```
From: http://webreflection.blogspot.com.br/2009/06/inputfocus-something-really-annoying.html
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渐次进展

2020-11-30 01:34

There are two parts to your question.

1) How to focus an input on page load?

You can just add the autofocus attribute to the input.

<input id="myinputbox" type="text" autofocus>

However, this might not be supported in all browsers, so we can use javascript.

window.onload = function() {
  var input = document.getElementById("myinputbox").focus();
}

2) How to place cursor at the end of the input text?

Here's a non-jQuery solution with some borrowed code from another SO answer.

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.

<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>

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