我正在使用Angular2，我想要禁用提交按钮，直到所有字段都包含其中的内容，我尝试了以下但是它不起作用。
import {Component, ViewEncapsulation} from "angular2/core";
import {FORM_DIRECTIVES, FormBuilder, ControlGroup, AbstractControl, Validators, Control} from "angular2/common";
@Component({
selector: "parameters-form",
directives: [FORM_DIRECTIVES],
encapsulation: ViewEncapsulation.None,
styleUrls: [
"app/css/main.css"
],
template: `
<div class="ui grid">
<div class="eleven wide column">
<h1>Parameters Form</h1>
<form [ngFormModel]="myForm" (ngSubmit)="onSubmit(myForm.value)" class="ui form">
<div class="two fields">
<div class="field">
<label for="numberOfModelParameters">Number of Model Parameters(n)</label>
<input type="number" #n
id="numberOfModelParameters"
placeholder="numberOfModelParameters Param"
[ngFormControl]="myForm.controls['numberOfModelParameters']">
</div>
<div class="field">
<label for="numberOfModelVariables">Number of Model Variables(m)</label>
<input type="number" #m
id="numberOfModelVariables"
placeholder="numberOfModelVariables Param"
[ngFormControl]="myForm.controls['numberOfModelVariables']">
</div>
</div>
<div class="two fields">
<div class="field">
<label for="systemParameters">System Parameters</label>
<input type="number"
id="systemParameters"
placeholder="systemParameters Param"
[ngFormControl]="systemParameters"
(keypress)="addToArray($event, systemParameters.value, 'systemParameters')">
</div>
<div class="field">
<label for="restrictOperator">Restrict Operator</label>
<input type="number"
id="restrictOperator"
placeholder="restrictOperator Param"
[ngFormControl]="myForm.controls['restrictOperator']"
(keypress)="addToArray($event, restrictOperator.value, 'restrictOperator')">
</div>
</div>
<div class="two fields">
<div class="field">
<label for="param">Param</label>
<input type="number"
id="param"
placeholder="param"
[ngFormControl]="myForm.controls['param']"
(keypress)="addToArray($event, param.value, 'param')">
</div>
<div class="field">
<label for="liftOperator">Lift Operator</label>
<input type="number"
id="liftOperator"
placeholder="liftOperator Param"
[ngFormControl]="myForm.controls['liftOperator']"
(keypress)="addToArray($event, liftOperator.value, 'liftOperator')">
</div>
</div>
<div class="two fields">
<div class="field">
<label for="netLogoFile">Net Logo File</label>
<input type="number"
id="netLogoFile"
placeholder="netLogoFile Param"
[ngFormControl]="myForm.controls['netLogoFile']">
</div>
<div class="field">
<label for="xInitial">xInitial</label>
<input type="number"
id="xInitial"
placeholder="xInitial Param"
[ngFormControl]="myForm.controls['xInitial']"
(keypress)="addToArray($event, xInitial.value, 'xInitial')">
</div>
</div>
<div class="field">
<label for="realisations">Realisations</label>
<input type="number"
id="realisations"
placeholder="Realisations Param"
[ngFormControl]="myForm.controls['realisations']">
</div>
<div class="field">
<label for="NumConstSteps">Number of Constant Steps</label>
<input type="number"
id="NumConstSteps"
placeholder="NumConstSteps Param"
[ngFormControl]="myForm.controls['numConstSteps']">
</div>
<div class="field">
<label for="timeHorizon">Time Horizon</label>
<input type="number"
id="timeHorizon"
placeholder="timeHorizon Param"
[ngFormControl]="myForm.controls['timeHorizon']">
</div>
<div class="field">
<label for="continuationStep">Continuation Step</label>
<input type="number"
id="continuationStep"
placeholder="continuationStep Param"
[ngFormControl]="myForm.controls['continuationStep']">
</div>
<div class="field">
<label for="continuationStepSign">Continuation Step Sign (+,-)</label>
<input type="text"
id="continuationStepSign"
placeholder="continuationStep sign"
[ngFormControl]="myForm.controls['continuationStepSign']">
</div>
<button [disabled]="!isFullfilled(m.value, n.value) && !myForm.valid" type="submit" class="ui button">Submit</button>
</form>
</div>
<div class="five wide column">
<div class="parameter-values-display">
<pre>{ System } parameters</pre>
<li class="parameters" *ngFor="#sa of system_arr">
<p>{{ sa }}</p>
<button class="destroy" type="button" (click)="deleteItem(a, 'systemParameters')"></button>
</li>
<pre>{ Param } Parameters</pre>
<li class="parameters" *ngFor="#pa of param_arr">
<p>{{ pa }}</p>
<button class="destroy" type="button" (click)="deleteItem(a, 'param')"></button>
</li>
<pre>{ Restrict Operator } parameters</pre>
<li class="parameters" *ngFor="#ra of restrict_arr">
<p>{{ ra }}</p>
<button class="destroy" type="button" (click)="deleteItem(a, 'restrictOperator')"></button>
</li>
<pre>{ Lift Operator } parameters</pre>
<li class="parameters" *ngFor="#la of lift_arr">
<p>{{ la }}</p>
<button class="destroy" type="button" (click)="deleteItem(a, 'liftOperator')"></button>
</li>
<pre>{ xInitial } parameters</pre>
<li class="parameters" *ngFor="#xa of xinitial_arr">
<p>{{ xa }}</p>
<button class="destroy" type="button" (click)="deleteItem(a, 'xInitial')"></button>
</li>
</div>
</div>
</div>
`
})
export class ParametersForm {
myForm: ControlGroup;
systemParameters: AbstractControl;
param: AbstractControl;
liftOperator: AbstractControl;
restrictOperator: AbstractControl;
xInitial: AbstractControl;
system_arr: number[];
param_arr: number[];
restrict_arr: number[];
lift_arr: number[];
xinitial_arr: number[];
constructor(fb: FormBuilder) {
this.myForm = fb.group({
"realisations" : ["", Validators.required],
"numConstSteps" : ["", Validators.required],
"timeHorizon": ["", Validators.required],
"continuationStep" : ["", Validators.required],
"continuationStepSign" : ["", Validators.required],
"numberOfModelParameters" : ["", Validators.required],
"systemParameters" : [""],
"param" : [""],
"netLogoFile" : ["", Validators.required],
"numberOfModelVariables" : ["", Validators.required],
"restrictOperator" : [""],
"liftOperator" : [""],
"xInitial" : [""]
});
this.system_arr = [];
this.param_arr = [];
this.restrict_arr = [];
this.lift_arr = [];
this.xinitial_arr = [];
this.param = this.myForm.controls["param"];
this.systemParameters = this.myForm.controls["systemParameters"];
this.restrictOperator = this.myForm.controls["restrictOperator"];
this.liftOperator = this.myForm.controls["liftOperator"];
this.xInitial = this.myForm.controls["xInitial"];
}
addToArray(event, value: number, target: string): void {
if (event.which === 13 && typeof value === "number") {
switch (target) {
case "systemParameters":
this.system_arr.push(value);
(<Control>this.systemParameters).updateValue("");
break;
case "param":
this.param_arr.push(value);
(<Control>this.param).updateValue("");
break;
case "liftOperator":
this.lift_arr.push(value);
(<Control>this.liftOperator).updateValue("");
break;
case "restrictOperator":
this.restrict_arr.push(value);
(<Control>this.restrictOperator).updateValue("");
break;
case "xInitial":
this.xinitial_arr.push(value);
(<Control>this.xInitial).updateValue("");
break;
}
}
}
deleteItem(value: any, target: string): void {
let pos = 0;
switch (target) {
case "systemParameters":
pos = this.system_arr.indexOf(value);
this.system_arr.splice(pos, 1);
break;
case "param":
pos = this.param_arr.indexOf(value);
this.param_arr.splice(pos, 1);
break;
case "liftOperator":
pos = this.lift_arr.indexOf(value);
this.lift_arr.splice(pos, 1);
break;
case "restrictOperator":
pos = this.restrict_arr.indexOf(value);
this.restrict_arr.splice(pos, 1);
break;
case "xInitial":
pos = this.xinitial_arr.indexOf(value);
this.xinitial_arr.splice(pos, 1);
break;
}
}
isFullfilled(m: number, n: number) {
console.log( `here is m:${m} and here is n:${n}`);
console.log(`here is restrict array: ${this.restrict_arr.length}`);
console.log(`here is xinitial array: ${this.xinitial_arr.length}`);
console.log(`here is param array: ${this.param_arr.length}`);
console.log(`here is system array: ${this.system_arr.length}`);
console.log(`here is lift array: ${this.lift_arr.length}`);
if (
m == this.restrict_arr.length
&& m == this.xinitial_arr.length
&& m == this.lift_arr.length
&& n == this.param_arr.length
&& n == this.system_arr.length
) {
if (m != 0 && n != 0){
console.log("returned true");
return true;
}
}
return null;
}
onSubmit(form: any): void {
form.systemParameters = this.system_arr;
form.liftOperator = this.lift_arr;
form.restrictOperator = this.restrict_arr;
form.param = this.param_arr;
form.xInitial = this.xinitial_arr;
console.log("your submitted value:", form);
}
}
我使用Validators.required并放[disabled]=!myForm.valid但似乎没有用，我有5个字段虽然不需要任何值，因为我按下Enter键将它们的值推入各自的数组他们各自的领域。
这是一个plunker
答案 0 :(得分：1)
你可以在你的表单上添加一个onChange方法（不确定语法，但原理仍然相同）
<form [ngFormModel]="myForm" (ngChange)="checkFields()" (ngSubmit)="onSubmit(myForm.value)" class="ui form">
function checkFields(){
inputs = document.getElementsByTagName("input");
isEveryInputFilled = true;
for(input in inputs){
if(input.value == null || input.value == "")
isEveryInputFilled = false;
}
}
答案 1 :(得分：0)
如果您将isFullfilled作为吸气剂plunker
<button [disabled]="!isFullfilled || !myForm.valid" type="submit" class="ui button">Submit</button>
get isFullfilled() {
let m: number = this.myForm.controls["numberOfModelVariables"].value;
let n: number = this.myForm.controls['numberofModelParameters'].value;
if (
m == this.restrict_arr.length
&& m == this.xinitial_arr.length
&& m == this.lift_arr.length
&& n == this.param_arr.length
&& n == this.system_arr.length
) {
if (m != 0 && n != 0){
console.log("returned true");
return true;
}
}
return null;
}
答案 2 :(得分：0)
好吧，好像我发现了我犯的错误。
它位于这一行
<button [disabled]="!isFullfilled(m.value, n.value) && !myForm.valid" type="submit" class="ui button">Submit</button>
特别是代码的这一部分
"!isFullfilled(m.value, n.value) && !myForm.valid"
这意味着如果isFullfilled在其函数中返回true并转换为false并且!myForm.valid返回true或false [disabled]指令只将其视为false，因为
true && false => returns false
所以按钮启用了
true || false => returns true
允许按钮被禁用，直到满足所有条件。
将其更改为使用OR（||）完成了工作。非常棘手。我将把它留在这里供将来参考。