TypeError：object不是函数 [英] TypeError: object is not a function
问题描述
我正在为我的学校开发这个webapp。页面应该通过url参数class过滤条目。这可以正常工作，但是当我尝试更改过滤器时，它会给出TypeError：object is not a function。我究竟做错了什么？
I'm developing this webapp for my school. The page is supposed to filter entries by the url parameter "class". This works fine as far as i can tell, but when i try to change the filter it gives "TypeError: object is not a function". What am i doing wrong?
<html>
<head>
<TITLE>Cancelled lessons</TITLE>
</head>
<body>
<script>
function filter(text){
text = text.toLowerCase();
for (i=0;i<lessonList.length;i++){
if(lessonList[i].innerHTML.toLowerCase().indexOf(text)==-1){
lessonList[i].style.display = "none";
}
else{
lessonList[i].style.display ="";
}
}
}
function gup( name )
{
name = name.replace(/[\[]/,"\\\[").replace(/[\]]/,"\\\]");
var regexS = "[\\?&]"+name+"=([^&#]*)";
var regex = new RegExp( regexS );
var results = regex.exec( window.location.href );
if( results == null )
return "";
else
return results[1];
}
</script>
<form>
Filter: <input type="text" id="filter" oninput="filter(document.getElementById('filter'))"/>
</form>
<div id="lessons">
<div class="entry"> MaA 11:00 C131 Ej NV3C</div>
</div>
<script>
var lessonList = document.getElementsByClassName("entry");
var filterField =document.getElementById("filter");
filterField.value = gup("class");
filter(filterField.value);
</script>
</body>
</html>
推荐答案
看起来oninput处理程序调用过滤器函数来自表单的范围（document.forms [0]）而不是全局。如果检查document.forms [0] .filter的值，它将返回输入标记。您只需要确保函数名称与输入名称/ id不同。
It looks like the "oninput" handler calls the filter function from the scope of the form (document.forms[0]) rather than globally. If you check the value of document.forms[0].filter it'll return the input tag. You just need to make sure that the function name is different than the input name/id.
这也意味着您不需要每个按id获取输入字段时间，它已经确定为这个
This also means you don't need to get the input field by id every time, it's already scoped as this
<input type="text" id="filterField" oninput="filter(this.value)"/>
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