在JQuery中清除文本字段值 [英] Clear text field value in JQuery
问题描述
我知道这是一个简单的问题,但由于某种原因,这只是我的工作。每次下拉菜单更改时,我都会触发一个功能。下面是相关的代码,假设存在一个值,清除包含在.change函数中的文本字段的当前值:
var doc_val_check = $('#doc_title')。attr(value);
if(doc_val_check.length> 0){
doc_val_check ==;
}
我觉得我缺少一些非常简单的东西。
doc_val_check ==; // ==是平等检查运算符
应该是
doc_val_check =; // =是赋值运算符。你需要设置空值
//所以你需要=
你可以写下如下所示的完整代码:
var doc_val_check = $ .trim($('#doc_title')。val() ); //获取文本的值
//使用.val()的字段
if(doc_val_check.length){
doc_val_check =; //这将不会更新您的文本字段
}
您需要尝试
$('#doc_title') .attr('value',doc_val_check);
//或
$('doc_title')。val(doc_val_check);
但我认为您不需要上述过程。
总之,只有一行
$('# DOC_TITLE')VAL( )。
$('# DOC_TITLE')VAL( )。
注意
.val()
用于在文本字段中设置/获取值。使用参数,它充当setter,并且不带参数作为getter。
阅读更多关于 .val()
I understand this is an easy question but for some reason this just isn't working for me. I have a function that is triggered everytime a drop down menu is changed. Here is the relevant code that is suppose to grab the current value of the text field, if a value exists, clear it that is contained within the .change function:
var doc_val_check = $('#doc_title').attr("value");
if (doc_val_check.length > 0) {
doc_val_check == "";
}
I feel like I am missing something very simple.
doc_val_check == ""; // == is equality check operator
should be
doc_val_check = ""; // = is assign operator. you need to set empty value
// so you need =
You can write you full code like this:
var doc_val_check = $.trim( $('#doc_title').val() ); // take value of text
// field using .val()
if (doc_val_check.length) {
doc_val_check = ""; // this will not update your text field
}
To update you text field with a ""
you need to try
$('#doc_title').attr('value', doc_val_check);
// or
$('doc_title').val(doc_val_check);
But I think you don't need above process.
In short, just one line
$('#doc_title').val("");
Note
.val()
use to set/ get value in text field. With parameter it acts as setter and without parameter acts as getter.
Read more about .val()
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