[英]Javascript function not returning a value
我有一個javascript函數,檢查文本框中的值,如果文本框不是空白,它輸出一個語句。 文本框采用數值,我想包括輸出到html的數值。
這是html
<br><label id="cancelphoneLabel">1-800-555-1111</label>
<br><label id="mdamountLabel">Monthly Donation:
<td>
<input type="text" id="mdamountBox" style="width:50px;" name="md_amt" value="" placeholder="Monthly" onkeyup="monthlycheck()" autocomplete="off">
<br><label id="mnthlychkdiscoLabel"> </label>
和Javascript
function monthlycheck() {
var mnthchk = document.getElementById("mdamountBox").innerHTML; <---i want to pass the value of this box
var cancelPhone = document.getElementById("cancelphoneLabel").innerHTML;
if (mnthchk.value != "") {
var newHTML = "<span style='color:#24D330'> Your Monthly pledge in the amount of $<label id='dollarLabel'> </label> is valid and will be deducted this time every month<br> untill you notify us of its cancellation by calling <label id='cancelphonelistLabel'> </label> </span>";
document.getElementById("mnthlychkdiscoLabel").innerHTML = newHTML;
document.getElementById("cancelphonelistLabel").innerHTML = cancelPhone;
document.getElementById("dollarLabel").innerHTML = mnthchk; <----passed to here
我無法獲得傳遞的值,它只顯示空白,我可以硬編碼一個值並輸出正常,這就是jsfiddle目前的方式http://jsfiddle.net/rn5HH/4/
提前致謝
輸入元素沒有子節點,因此innerHTML
是空白的。 如果要讀取其值,請使用value
屬性。
你的路線:
var mnthchk = document.getElementById("mdamountBox").innerHTML;
應該:
var mnthchk = document.getElementById("mdamountBox");
然后你可以得到文本輸入的值,如下所示:
var newmnthchk = mnthchk.value;
在這里工作JS小提琴: http : //jsfiddle.net/rn5HH/10/
使用document.getElementById("mdamountBox").value
這里的問題是你想要獲取innerHtml,你想要的值。 從你的小提琴,只需改變這一行:
var mnthchk = document.getElementById("mdamountBox").innerHTML;
......對此:
var mnthchk = document.getElementById("mdamountBox").value;
檢查以下代碼:
HTML代碼
<br><label id="cancelphoneLabel">1-800-555-1111</label>
<br><label id="mdamountLabel">Monthly Donation:
<td>
<input type="text" id="mdamountBox" style="width:50px;" name="md_amt" value="" placeholder="Monthly" onkeyup="monthlycheck()" autocomplete="off">
<br><label id="mnthlychkdiscoLabel"> </label>
Javascript代碼
function monthlycheck() {
var mnthchk = document.getElementById("mdamountBox").value;
var cancelPhone = document.getElementById("cancelphoneLabel").innerHTML;
if (mnthchk.value != "") {
var newmnthchk = '5';
newmnthchk = mnthchk;
var newHTML = "<span style='color:#24D330'> Your Monthly pledge in the amount of $<label id='dollarLabel'> </label> is valid and will be deducted this time every month<br> untill you notify us of its cancellation by calling <label id='cancelphonelistLabel'> </label> </span>";
document.getElementById("mnthlychkdiscoLabel").innerHTML = newHTML;
document.getElementById("cancelphonelistLabel").innerHTML = cancelPhone;
document.getElementById("dollarLabel").innerHTML = newmnthchk;
}
}
這是在Fiddle上完美檢查的工作代碼,您需要使用獲取DOM值
var mnthchk = document.getElementById("mdamountBox").value;
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