Populate text box with JavaScript on PageLoad
I have a text box开发者_运维技巧 called txtName on my form.
In my page I know I need to place the code in my HEAD tag like so......
<script type='text/javascript' language="javascript">
document.FormName.txtName.value = "Robert";
</script>
But I cant seem to set a value to my textbox txtName with the above code......
That's because your code get executed before the DOM is created. You can do something like this
window.onload = function() {
document.forms['FormName'].elements['txtName'].value = "Robert";
}
or use JQuery
$(function() {
document.forms['FormName'].elements['txtName'].value = "Robert";
// for a shorter syntax use id
$('#txtNameId').val("Robert");
}
Your script executed before page loaded. Use onload event
Can you set the id on the textbox? Then you can use getElementByID("textboxid"); Selecting by id is faster.
UPDATE: You need to ensure that the DOM has been load so that your script can locate the element you want to update. One way is:
<body>
<form>
<input id="txtName" name="txtaaaName" type="text" value="notnow"/>
</form>
<script type="text/javascript">
function LoadTextBox(){
document.getElementById("txtName").value = "ready to go";
}
LoadTextBox();
</script>
</body>
An alternative could be where you use onload in the body tag:
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<title>Untitled Document</title>
<script type="text/javascript">
function LoadTextBox(){
document.getElementById("txtName").value = "ready to go";
}
</script>
</head>
<body onload="LoadTextBox">
<form>
<input id="txtName" name="txtaaaName" type="text" value="notnow"/>
</form>
</body>
加载中,请稍侯......
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