[英]Converting currencies using JAVASCRIPT. can't set the value of converted input text field through my function
我正在尝试使用html和javascript (不使用jquery)创建货币转换器。 我已经尝试了很多方法,但是无法将文本字段的值设置为转换后的金额。 我的代码出了什么问题?
因此,我要尝试的是基本上检查我的初始金额是哪种货币,基于该调用正确的函数进行计算,然后将 id =“ cur2”的输入字段的值设置为这些计算的结果。 我尝试使用以下javascript代码来做到这一点。 我仅向您提供欧元对其他货币的功能(其余工作类似):
window.onload = function() { document.getElementById("btnConvert").addEventListener("click", convert); } function convert() { var select = document.getElementById("currency1"); var curr = select.options[select.selectedIndex].value; var val = document.getElementById("cur2").value; if (curr == "EUR") { val = EURtoOther(); } if (curr == "USD") { val = USDtoOther(); } if (curr == "GBP") { val = GBPtoOther(); } if (curr == "AUD") { val = AUDtoOther(); } if (curr == "JPY") { val = JPYtoOther(); } } function EURtoOther() { var select = document.getElementById("currency2"); var curr = select.options[select.selectedIndex].value; var initval = document.getElementById("cur1").value; if (curr == "EUR") { return initval * 1.0; } if (curr == "USD") { return initval * 1.13; } if (curr == "GBP") { return initval * 0.79; } if (curr == "AUD") { return initval * 1.55; } if (curr == "JPY") { return initval * 123.27; } }
<select id="currency1"> <option value="EUR">Euro</option> <option value="USD">US Dollar</option> <option value="GBP">British Pound</option> <option value="AUD">Australian Dollar</option> <option value="JPY">Japanese Yen</option> </select> <input type="number" id="cur1"> <button id="btnConvert">Convert</button> <select id="currency2"> <option value="EUR">Euro</option> <option value="USD">US Dollar</option> <option value="GBP">British Pound</option> <option value="AUD">Australian Dollar</option> <option value="JPY">Japanese Yen</option> </select> <input type="text" id="cur2">
不工作,我不知道为什么。 提前致谢。
您必须要做document.getElementById().value = val;
。 val
与该元素无关,它只是一个值,因此需要在之后进行设置。
您没有设置第二个文本框的值。 采用
document.getElementById("cur2").value = val;
设置第二个文本框的值
window.onload = function() { document.getElementById("btnConvert").addEventListener("click", convert); } function convert() { var select = document.getElementById("currency1"); var curr = select.options[select.selectedIndex].value; var val = document.getElementById("cur2").value; if (curr == "EUR") { val = EURtoOther(); } if (curr == "USD") { // val = USDtoOther(); } if (curr == "GBP") { // val = GBPtoOther(); } if (curr == "AUD") { // val = AUDtoOther(); } if (curr == "JPY") { // val = JPYtoOther(); } document.getElementById("cur2").value = val; } function EURtoOther() { var select = document.getElementById("currency2"); var curr = select.options[select.selectedIndex].value; var initval = document.getElementById("cur1").value; if (curr == "EUR") { return initval * 1.0; } if (curr == "USD") { return initval * 1.13; } if (curr == "GBP") { return initval * 0.79; } if (curr == "AUD") { return initval * 1.55; } if (curr == "JPY") { return initval * 123.27; } }
<select id="currency1"> <option value="EUR">Euro</option> <option value="USD">US Dollar</option> <option value="GBP">British Pound</option> <option value="AUD">Australian Dollar</option> <option value="JPY">Japanese Yen</option> </select> <input type="number" id="cur1"> <button id="btnConvert">Convert</button> <select id="currency2"> <option value="EUR">Euro</option> <option value="USD">US Dollar</option> <option value="GBP">British Pound</option> <option value="AUD">Australian Dollar</option> <option value="JPY">Japanese Yen</option> </select> <input type="text" id="cur2">
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