javascript 使用javascript更改表单字段值
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change form field value with javascript
提问by mohit
<script type="text/javascript">
function up(d,mul)
{
alert(d);
form1.d.value=mul;
}
</script>
up is a function name with which i am trying to update the value of field(field name=d). But its not working. plz somebody help me.
up 是一个函数名，我试图用它来更新字段（字段名=d）的值。但它不工作。请有人帮助我。
回答by Kristoffer Sall-Storgaard
You can handle it like so:
你可以这样处理：
The HTML:
HTML：
?<form method='post' action='doesnt_matter'>
<input type='text' name='field1' />
<input type='text' name='field2' />
</form>??????????????????????????????????????????????????????????????????
The JavaScript:
JavaScript：
form = document.forms[0];
function up(d,mul)
{
alert(d);
form[d].value=mul;
}
up('field1','Hello field 1');
up('field2','Hello field 2');
?
回答by Felix Kling
Well you pass das parameter. So you either have to do (renaming it do fieldname):
那么你d作为参数传递。所以你要么必须做（重命名它做fieldname）：
function up(fieldname,mul)
{
document.form1[fieldname].value=mul;
}
and calling it with up('d', 'newValue'),
并调用它 up('d', 'newValue')，
or let dbe:
或者让我们d：
function up(mul)
{
document.form1.d.value=mul;
}
Not sure if you need documentbut I think you do.
不确定您是否需要，document但我认为您需要。
See an example here: http://jsfiddle.net/8uyv8/
在此处查看示例：http: //jsfiddle.net/8uyv8/
回答by methodin
function up(d,mul) { alert(d); form1[d].value=mul; }
You can't use d literally here as it assumes you are looking for an element named "d". So you have to use d in a context where it will use it's value, in this case, an array index.
您不能在这里直接使用 d，因为它假定您正在寻找名为“d”的元素。所以你必须在一个上下文中使用 d ，它将使用它的值，在这种情况下，是一个数组索引。
