javascript javascript中的createElement设置“onchange”属性
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createElement in javascript to set "onchange" attribute
提问by user1647308
I am trying to dynamically add a new input feild with the "onchange" attribute:
我正在尝试使用“onchange”属性动态添加一个新的输入字段：
var f = document.getElementById("dN[" + fieldsd + "]"); // create/insert new
el = document.createElement("input");
el = f.appendChild(el);
el.name = "dName[" + fieldsd + "]";
el.id = "dName[" + fieldsd + "]";
el.onchange = "validation()";
I have also tried setAttribute both don't work for me. Is there a way to make this work or a work around?
我也试过 setAttribute 都不适合我。有没有办法使这项工作或解决方法？
回答by scott.korin
In JavaScript, set the onchangeproperty to be a pointer to a function, not an actual string:
在 JavaScript 中，将onchange属性设置为指向函数的指针，而不是实际的字符串：
var f = document.getElementById("dN[" + fieldsd + "]"); // create/insert new
el = document.createElement("input");
el = f.appendChild(el);
el.name = "dName[" + fieldsd + "]";
el.id = "dName[" + fieldsd + "]";
el.onchange = validation;
(Where you have a function named validation)
（你有一个名为 的函数validation）
If you need to pass parameters, set onchangeto a function that calls the validation function:
如果需要传递参数，设置onchange为调用验证函数的函数：
el.onchange = function () {
validation(param1, param2, ...);
};
Or, if you want information from the input itself, you can use the thiskeyword within your validationfunction:
或者，如果您想要来自输入本身的信息，您可以this在您的validation函数中使用关键字：
el.onchange = validation;
....
function validation() {
// this is the "context" for the function. In this case
// the element that changed.
var value = this.value;
}
