[英]How do I change the <label for> value, using JavaScript?
我有一個帶有標簽的簡單 HTML 文本框,我希望能夠使用 JavaScript 更改標簽值。 我嘗試了下面概述的各種方法,但似乎沒有任何成功。 任何幫助,將不勝感激!
HTML:
<html>
<body>
<li id="job_number_wrapper">
<label for="job_number">I WANT TO CHANGE THIS TEXT</label>
<input type="text" id="job_number" name="job_number">
</li>
Javascript:
<script>
function myFunction() {
document.getElementById("job_number").htmlForVal = "New text"; //does nothing
if (job_number_wrapper.textContent)
job_number_wrapper.textContent = "New Text"; //changes text, but removes text box
if (job_number.textContent)
job_number.textContent = "New Text"; //does nothing
$("label[for=job_number]").html("New Text"); //does nothing
$("label[for=job_number]").text("New Text"); //does nothing
document.getElementById('job_number').innerHTML = 'New Text'; //does nothing
document.getElementById('job_number').innerText = 'New Text'; //does nothing
document.getElementById('job_number').value = 'New Text'; //does nothing
$('#job_number').val("New Text"); //populates the textbox value, but does not change the label
var label = document.querySelector('label[for="job_number"]'); //does nothing
label.textContent = "New Text" //does nothing
}
myFunction();
</script>
</body>
</html>
你錯過了'
里面。
$("label[for='job_number]'").html("New Text");
$("label[for='job_number]'").text("New Text");
您沒有選擇帶有document.getElementById("job_number")
的標簽。 相反,試試這個:
const labelEl = document.querySelector('#job_number_wrapper label');
或者,您可以為標簽指定一個 id 或 class 並直接選擇它。
當您嘗試調用querySelector
時,您幾乎做對了:
var label = document.querySelector('label[for="job_number"]'); //does nothing
label.textContent = "New Text" //does nothing
此選擇器失敗的唯一原因是您用於選擇job_number
的雙引號。 刪除它們,它將起作用:
var label = document.querySelector("label[for=job_number]"); label.textContent = "New Text";
<label for="job_number">I WANT TO CHANGE THIS TEXT</label> <input type="text" id="job_number" name="job_number" />
另見: 相關問題
function test() { const e = document.querySelector("label[for=job_number]"); e.innerText = "some other name"; }
<li id="job_number_wrapper"> <label for="job_number">I WANT TO CHANGE THIS TEXT</label> <input type="text" id="job_number" name="job_number" /> </li> <button onclick="test()">change label text</button>
您可以簡單地使用此邏輯來處理標簽
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